text: /**!
   * @fileOverview Kickass library to create and place poppers near their reference elements.
   * @version 1.14.5
   * @license
   * Copyright (c) 2016 Federico Zivolo and contributors
   *
   * Permission is hereby granted, free of charge, to any person obtaining a copy
   * of this software and associated documentation files (the "Software"), to deal
   * in the Software without restriction, including without limitation the rights
   * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
   * copies of the Software, and to permit persons to whom the Software is
   * furnished to do so, subject to the following conditions:
   *
   * The above copyright notice and this permission notice shall be included in all
   * copies or substantial portions of the Software.
   *
   * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
   * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
   * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
   * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
   * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
   * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
   * SOFTWARE.
   */
  (function (global, factory) {
  	typeof exports === 'object' && typeof module !== 'undefined' ? module.exports = factory() :
  		typeof define === 'function' && define.amd ? define(factory) :
  			(global.Popper = factory());
  }(this, (function () { 'use strict';
  
  	var isBrowser = typeof window !== 'undefined' && typeof document !== 'undefined';
  
  	var longerTimeoutBrowsers = ['Edge', 'Trident', 'Firefox'];
  	var timeoutDuration = 0;
  	for (var i = 0; i < longerTimeoutBrowsers.length; i += 1) {
  		if (isBrowser && navigator.userAgent.indexOf(longerTimeoutBrowsers[i]) >= 0) {
  			timeoutDuration = 1;
  			break;
  		}
  	}
  
  	function microtaskDebounce(fn) {
  		var called = false;
  		return function () {
  			if (called) {
  				return;
  			}
  			called = true;
  			window.Promise.resolve().then(function () {
  				called = false;
  				fn();
  			});
  		};
  	}
  
  	function taskDebounce(fn) {
  		var scheduled = false;
  		return function () {
  			if (!scheduled) {
  				scheduled = true;
  				setTimeout(function () {
  					scheduled = false;
  					fn();
  				}, timeoutDuration);
  			}
  		};
  	}
  
  	var supportsMicroTasks = isBrowser && window.Promise;
  
  	/**
  	 * Create a debounced version of a method, that's asynchronously deferred
  	 * but called in the minimum time possible.
  	 *
  	 * @method
  	 * @memberof Popper.Utils
  	 * @argument {Function} fn
  	 * @returns {Function}
  	 */
  	var debounce = supportsMicroTasks ? microtaskDebounce : taskDebounce;
  
  	/**
  	 * Check if the given variable is a function
  	 * @method
  	 * @memberof Popper.Utils
  	 * @argument {Any} functionToCheck - variable to check
  	 * @returns {Boolean} answer to: is a function?
  	 */
  	function isFunction(functionToCheck) {
  		var getType = {};
  		return functionToCheck && getType.toString.call(functionToCheck) === '[object Function]';
  	}
  
  	/**
  	 * Get CSS computed property of the given element
  	 * @method
  	 * @memberof Popper.Utils
  	 * @argument {Eement} element
  	 * @argument {String} property
  	 */
  	function getStyleComputedProperty(element, property) {
  		if (element.nodeType !== 1) {
  			return [];
  		}
  		// NOTE: 1 DOM access here
  		var window = element.ownerDocument.defaultView;
  		var css = window.getComputedStyle(element, null);
  		return property ? css[property] : css;
  	}
  
  	/**
  	 * Returns the parentNode or the host of the element
  	 * @method
  	 * @memberof Popper.Utils
  	 * @argument {Element} element
  	 * @returns {Element} parent
  	 */
  	function getParentNode(element) {
  		if (element.nodeName === 'HTML') {
  			return element;
  		}
  		return element.parentNode || element.host;
  	}
  
  	/**
  	 * Returns the scrolling parent of the given element
  	 * @method
  	 * @memberof Popper.Utils
  	 * @argument {Element} element
  	 * @returns {Element} scroll parent
  	 */
  	function getScrollParent(element) {
  		// Return body, `getScroll` will take care to get the correct `scrollTop` from it
  		if (!element) {
  			return document.body;
  		}
  
  		switch (element.nodeName) {
  			case 'HTML':
  			case 'BODY':
  				return element.ownerDocument.body;
  			case '#document':
  				return element.body;
  		}
  
  		// Firefox want us to check `-x` and `-y` variations as well
  
  		var _getStyleComputedProp = getStyleComputedProperty(element),
  			overflow = _getStyleComputedProp.overflow,
  			overflowX = _getStyleComputedProp.overflowX,
  			overflowY = _getStyleComputedProp.overflowY;
  
  		if (/(auto|scroll|overlay)/.test(overflow + overflowY + overflowX)) {
  			return element;
  		}
  
  		return getScrollParent(getParentNode(element));
  	}
  
  	var isIE11 = isBrowser && !!(window.MSInputMethodContext && document.documentMode);
  	var isIE10 = isBrowser && /MSIE 10/.test(navigator.userAgent);
  
  	/**
  	 * Determines if the browser is Internet Explorer
  	 * @method
  	 * @memberof Popper.Utils
  	 * @param {Number} version to check
  	 * @returns {Boolean} isIE
  	 */
  	function isIE(version) {
  		if (version === 11) {
  			return isIE11;
  		}
  		if (version === 10) {
  			return isIE10;
  		}
  		return isIE11 || isIE10;
  	}
  
  	/**
  	 * Returns the offset parent of the given element
  	 * @method
  	 * @memberof Popper.Utils
  	 * @argument {Element} element
  	 * @returns {Element} offset parent
  	 */
  	function getOffsetParent(element) {
  		if (!element) {
  			return document.documentElement;
  		}
  
  		var noOffsetParent = isIE(10) ? document.body : null;
  
  		// NOTE: 1 DOM access here
  		var offsetParent = element.offsetParent || null;
  		// Skip hidden elements which don't have an offsetParent
  		while (offsetParent === noOffsetParent && element.nextElementSibling) {
  			offsetParent = (element = element.nextElementSibling).offsetParent;
  		}
  
  		var nodeName = offsetParent && offsetParent.nodeName;
  
  		if (!nodeName || nodeName === 'BODY' || nodeName === 'HTML') {
  			return element ? element.ownerDocument.documentElement : document.documentElement;
  		}
  
  		// .offsetParent will return the closest TH, TD or TABLE in case
  		// no offsetParent is present, I hate this job...
  		if (['TH', 'TD', 'TABLE'].indexOf(offsetParent.nodeName) !== -1 && getStyleComputedProperty(offsetParent, 'position') === 'static') {
  			return getOffsetParent(offsetParent);
  		}
  
  		return offsetParent;
  	}
  
  	function isOffsetContainer(element) {
  		var nodeName = element.nodeName;
  
  		if (nodeName === 'BODY') {
  			return false;
  		}
  		return nodeName === 'HTML' || getOffsetParent(element.firstElementChild) === element;
  	}
  
  	/**
  	 * Finds the root node (document, shadowDOM root) of the given element
  	 * @method
  	 * @memberof Popper.Utils
  	 * @argument {Element} node
  	 * @returns {Element} root node
  	 */
  	function getRoot(node) {
  		if (node.parentNode !== null) {
  			return getRoot(node.parentNode);
  		}
  
  		return node;
  	}
  
  	/**
  	 * Finds the offset parent common to the two provided nodes
  	 * @method
  	 * @memberof Popper.Utils
  	 * @argument {Element} element1
  	 * @argument {Element} element2
  	 * @returns {Element} common offset parent
  	 */
  	function findCommonOffsetParent(element1, element2) {
  		// This check is needed to avoid errors in case one of the elements isn't defined for any reason
  		if (!element1 || !element1.nodeType || !element2 || !element2.nodeType) {
  			return document.documentElement;
  		}
  
  		// Here we make sure to give as "start" the element that comes first in the DOM
  		var order = element1.compareDocumentPosition(element2) & Node.DOCUMENT_POSITION_FOLLOWING;
  		var start = order ? element1 : element2;
  		var end = order ? element2 : element1;
  
  		// Get common ancestor container
  		var range = document.createRange();
  		range.setStart(start, 0);
  		range.setEnd(end, 0);
  		var commonAncestorContainer = range.commonAncestorContainer;
  
  		// Both nodes are inside #document
  
  		if (element1 !== commonAncestorContainer && element2 !== commonAncestorContainer || start.contains(end)) {
  			if (isOffsetContainer(commonAncestorContainer)) {
  				return commonAncestorContainer;
  			}
  
  			return getOffsetParent(commonAncestorContainer);
  		}
  
  		// one of the nodes is inside shadowDOM, find which one
  		var element1root = getRoot(element1);
  		if (element1root.host) {
  			return findCommonOffsetParent(element1root.host, element2);
  		} else {
  			return findCommonOffsetParent(element1, getRoot(element2).host);
  		}
  	}
  
  	/**
  	 * Gets the scroll value of the given element in the given side (top and left)
  	 * @method
  	 * @memberof Popper.Utils
  	 * @argument {Element} element
  	 * @argument {String} side `top` or `left`
  	 * @returns {number} amount of scrolled pixels
  	 */
  	function getScroll(element) {
  		var side = arguments.length > 1 && arguments[1] !== undefined ? arguments[1] : 'top';
  
  		var upperSide = side === 'top' ? 'scrollTop' : 'scrollLeft';
  		var nodeName = element.nodeName;
  
  		if (nodeName === 'BODY' || nodeName === 'HTML') {
  			var html = element.ownerDocument.documentElement;
  			var scrollingElement = element.ownerDocument.scrollingElement || html;
  			return scrollingElement[upperSide];
  		}
  
  		return element[upperSide];
  	}
  
  	/*
       * Sum or subtract the element scroll values (left and top) from a given rect object
       * @method
       * @memberof Popper.Utils
       * @param {Object} rect - Rect object you want to change
       * @param {HTMLElement} element - The element from the function reads the scroll values
       * @param {Boolean} subtract - set to true if you want to subtract the scroll values
       * @return {Object} rect - The modifier rect object
       */
  	function includeScroll(rect, element) {
  		var subtract = arguments.length > 2 && arguments[2] !== undefined ? arguments[2] : false;
  
  		var scrollTop = getScroll(element, 'top');
  		var scrollLeft = getScroll(element, 'left');
  		var modifier = subtract ? -1 : 1;
  		rect.top += scrollTop * modifier;
  		rect.bottom += scrollTop * modifier;
  		rect.left += scrollLeft * modifier;
  		rect.right += scrollLeft * modifier;
  		return rect;
  	}
  
  	/*
       * Helper to detect borders of a given element
       * @method
       * @memberof Popper.Utils
       * @param {CSSStyleDeclaration} styles
       * Result of `getStyleComputedProperty` on the given element
       * @param {String} axis - `x` or `y`
       * @return {number} borders - The borders size of the given axis
       */
  
  	function getBordersSize(styles, axis) {
  		var sideA = axis === 'x' ? 'Left' : 'Top';
  		var sideB = sideA === 'Left' ? 'Right' : 'Bottom';
  
  		return parseFloat(styles['border' + sideA + 'Width'], 10) + parseFloat(styles['border' + sideB + 'Width'], 10);
  	}
  
  	function getSize(axis, body, html, computedStyle) {
  		return Math.max(body['offset' + axis], body['scroll' + axis], html['client' + axis], html['offset' + axis], html['scroll' + axis], isIE(10) ? parseInt(html['offset' + axis]) + parseInt(computedStyle['margin' + (axis === 'Height' ? 'Top' : 'Left')]) + parseInt(computedStyle['margin' + (axis === 'Height' ? 'Bottom' : 'Right')]) : 0);
  	}
  
  	function getWindowSizes(document) {
  		var body = document.body;
  		var html = document.documentElement;
  		var computedStyle = isIE(10) && getComputedStyle(html);
  
  		return {
  			height: getSize('Height', body, html, computedStyle),
  			width: getSize('Width', body, html, computedStyle)
  		};
  	}
  
  	var classCallCheck = function (instance, Constructor) {
  		if (!(instance instanceof Constructor)) {
  			throw new TypeError("Cannot call a class as a function");
  		}
  	};
  
  	var createClass = function () {
  		function defineProperties(target, props) {
  			for (var i = 0; i < props.length; i++) {
  				var descriptor = props[i];
  				descriptor.enumerable = descriptor.enumerable || false;
  				descriptor.configurable = true;
  				if ("value" in descriptor) descriptor.writable = true;
  				Object.defineProperty(target, descriptor.key, descriptor);
  			}
  		}
  
  		return function (Constructor, protoProps, staticProps) {
  			if (protoProps) defineProperties(Constructor.prototype, protoProps);
  			if (staticProps) defineProperties(Constructor, staticProps);
  			return Constructor;
  		};
  	}();
  
  
  
  
  
  	var defineProperty = function (obj, key, value) {
  		if (key in obj) {
  			Object.defineProperty(obj, key, {
  				value: value,
  				enumerable: true,
  				configurable: true,
  				writable: true
  			});
  		} else {
  			obj[key] = value;
  		}
  
  		return obj;
  	};
  
  	var _extends = Object.assign || function (target) {
  		for (var i = 1; i < arguments.length; i++) {
  			var source = arguments[i];
  
  			for (var key in source) {
  				if (Object.prototype.hasOwnProperty.call(source, key)) {
  					target[key] = source[key];
  				}
  			}
  		}
  
  		return target;
  	};
  
  	/**
  	 * Given element offsets, generate an output similar to getBoundingClientRect
  	 * @method
  	 * @memberof Popper.Utils
  	 * @argument {Object} offsets
  	 * @returns {Object} ClientRect like output
  	 */
  	function getClientRect(offsets) {
  		return _extends({}, offsets, {
  			right: offsets.left + offsets.width,
  			bottom: offsets.top + offsets.height
  		});
  	}
  
  	/**
  	 * Get bounding client rect of given element
  	 * @method
  	 * @memberof Popper.Utils
  	 * @param {HTMLElement} element
  	 * @return {Object} client rect
  	 */
  	function getBoundingClientRect(element) {
  		var rect = {};
  
  		// IE10 10 FIX: Please, don't ask, the element isn't
  		// considered in DOM in some circumstances...
  		// This isn't reproducible in IE10 compatibility mode of IE11
  		try {
  			if (isIE(10)) {
  				rect = element.getBoundingClientRect();
  				var scrollTop = getScroll(element, 'top');
  				var scrollLeft = getScroll(element, 'left');
  				rect.top += scrollTop;
  				rect.left += scrollLeft;
  				rect.bottom += scrollTop;
  				rect.right += scrollLeft;
  			} else {
  				rect = element.getBoundingClientRect();
  			}
  		} catch (e) {}
  
  		var result = {
  			left: rect.left,
  			top: rect.top,
  			width: rect.right - rect.left,
  			height: rect.bottom - rect.top
  		};
  
  		// subtract scrollbar size from sizes
  		var sizes = element.nodeName === 'HTML' ? getWindowSizes(element.ownerDocument) : {};
  		var width = sizes.width || element.clientWidth || result.right - result.left;
  		var height = sizes.height || element.clientHeight || result.bottom - result.top;
  
  		var horizScrollbar = element.offsetWidth - width;
  		var vertScrollbar = element.offsetHeight - height;
  
  		// if an hypothetical scrollbar is detected, we must be sure it's not a `border`
  		// we make this check conditional for performance reasons
  		if (horizScrollbar || vertScrollbar) {
  			var styles = getStyleComputedProperty(element);
  			horizScrollbar -= getBordersSize(styles, 'x');
  			vertScrollbar -= getBordersSize(styles, 'y');
  
  			result.width -= horizScrollbar;
  			result.height -= vertScrollbar;
  		}
  
  		return getClientRect(result);
  	}
  
  	function getOffsetRectRelativeToArbitraryNode(children, parent) {
  		var fixedPosition = arguments.length > 2 && arguments[2] !== undefined ? arguments[2] : false;
  
  		var isIE10 = isIE(10);
  		var isHTML = parent.nodeName === 'HTML';
  		var childrenRect = getBoundingClientRect(children);
  		var parentRect = getBoundingClientRect(parent);
  		var scrollParent = getScrollParent(children);
  
  		var styles = getStyleComputedProperty(parent);
  		var borderTopWidth = parseFloat(styles.borderTopWidth, 10);
  		var borderLeftWidth = parseFloat(styles.borderLeftWidth, 10);
  
  		// In cases where the parent is fixed, we must ignore negative scroll in offset calc
  		if (fixedPosition && isHTML) {
  			parentRect.top = Math.max(parentRect.top, 0);
  			parentRect.left = Math.max(parentRect.left, 0);
  		}
  		var offsets = getClientRect({
  			top: childrenRect.top - parentRect.top - borderTopWidth,
  			left: childrenRect.left - parentRect.left - borderLeftWidth,
  			width: childrenRect.width,
  			height: childrenRect.height
  		});
  		offsets.marginTop = 0;
  		offsets.marginLeft = 0;
  
  		// Subtract margins of documentElement in case it's being used as parent
  		// we do this only on HTML because it's the only element that behaves
  		// differently when margins are applied to it. The margins are included in
  		// the box of the documentElement, in the other cases not.
  		if (!isIE10 && isHTML) {
  			var marginTop = parseFloat(styles.marginTop, 10);
  			var marginLeft = parseFloat(styles.marginLeft, 10);
  
  			offsets.top -= borderTopWidth - marginTop;
  			offsets.bottom -= borderTopWidth - marginTop;
  			offsets.left -= borderLeftWidth - marginLeft;
  			offsets.right -= borderLeftWidth - marginLeft;
  
  			// Attach marginTop and marginLeft because in some circumstances we may need them
  			offsets.marginTop = marginTop;
  			offsets.marginLeft = marginLeft;
  		}
  
  		if (isIE10 && !fixedPosition ? parent.contains(scrollParent) : parent === scrollParent && scrollParent.nodeName !== 'BODY') {
  			offsets = includeScroll(offsets, parent);
  		}
  
  		return offsets;
  	}
  
  	function getViewportOffsetRectRelativeToArtbitraryNode(element) {
  		var excludeScroll = arguments.length > 1 && arguments[1] !== undefined ? arguments[1] : false;
  
  		var html = element.ownerDocument.documentElement;
  		var relativeOffset = getOffsetRectRelativeToArbitraryNode(element, html);
  		var width = Math.max(html.clientWidth, window.innerWidth || 0);
  		var height = Math.max(html.clientHeight, window.innerHeight || 0);
  
  		var scrollTop = !excludeScroll ? getScroll(html) : 0;
  		var scrollLeft = !excludeScroll ? getScroll(html, 'left') : 0;
  
  		var offset = {
  			top: scrollTop - relativeOffset.top + relativeOffset.marginTop,
  			left: scrollLeft - relativeOffset.left + relativeOffset.marginLeft,
  			width: width,
  			height: height
  		};
  
  		return getClientRect(offset);
  	}
  
  	/**
  	 * Check if the given element is fixed or is inside a fixed parent
  	 * @method
  	 * @memberof Popper.Utils
  	 * @argument {Element} element
  	 * @argument {Element} customContainer
  	 * @returns {Boolean} answer to "isFixed?"
  	 */
  	function isFixed(element) {
  		var nodeName = element.nodeName;
  		if (nodeName === 'BODY' || nodeName === 'HTML') {
  			return false;
  		}
  		if (getStyleComputedProperty(element, 'position') === 'fixed') {
  			return true;
  		}
  		return isFixed(getParentNode(element));
  	}
  
  	/**
  	 * Finds the first parent of an element that has a transformed property defined
  	 * @method
  	 * @memberof Popper.Utils
  	 * @argument {Element} element
  	 * @returns {Element} first transformed parent or documentElement
  	 */
  
  	function getFixedPositionOffsetParent(element) {
  		// This check is needed to avoid errors in case one of the elements isn't defined for any reason
  		if (!element || !element.parentElement || isIE()) {
  			return document.documentElement;
  		}
  		var el = element.parentElement;
  		while (el && getStyleComputedProperty(el, 'transform') === 'none') {
  			el = el.parentElement;
  		}
  		return el || document.documentElement;
  	}
  
  	/**
  	 * Computed the boundaries limits and return them
  	 * @method
  	 * @memberof Popper.Utils
  	 * @param {HTMLElement} popper
  	 * @param {HTMLElement} reference
  	 * @param {number} padding
  	 * @param {HTMLElement} boundariesElement - Element used to define the boundaries
  	 * @param {Boolean} fixedPosition - Is in fixed position mode
  	 * @returns {Object} Coordinates of the boundaries
  	 */
  	function getBoundaries(popper, reference, padding, boundariesElement) {
  		var fixedPosition = arguments.length > 4 && arguments[4] !== undefined ? arguments[4] : false;
  
  		// NOTE: 1 DOM access here
  
  		var boundaries = { top: 0, left: 0 };
  		var offsetParent = fixedPosition ? getFixedPositionOffsetParent(popper) : findCommonOffsetParent(popper, reference);
  
  		// Handle viewport case
  		if (boundariesElement === 'viewport') {
  			boundaries = getViewportOffsetRectRelativeToArtbitraryNode(offsetParent, fixedPosition);
  		} else {
  			// Handle other cases based on DOM element used as boundaries
  			var boundariesNode = void 0;
  			if (boundariesElement === 'scrollParent') {
  				boundariesNode = getScrollParent(getParentNode(reference));
  				if (boundariesNode.nodeName === 'BODY') {
  					boundariesNode = popper.ownerDocument.documentElement;
  				}
  			} else if (boundariesElement === 'window') {
  				boundariesNode = popper.ownerDocument.documentElement;
  			} else {
  				boundariesNode = boundariesElement;
  			}
  
  			var offsets = getOffsetRectRelativeToArbitraryNode(boundariesNode, offsetParent, fixedPosition);
  
  			// In case of HTML, we need a different computation
  			if (boundariesNode.nodeName === 'HTML' && !isFixed(offsetParent)) {
  				var _getWindowSizes = getWindowSizes(popper.ownerDocument),
  					height = _getWindowSizes.height,
  					width = _getWindowSizes.width;
  
  				boundaries.top += offsets.top - offsets.marginTop;
  				boundaries.bottom = height + offsets.top;
  				boundaries.left += offsets.left - offsets.marginLeft;
  				boundaries.right = width + offsets.left;
  			} else {
  				// for all the other DOM elements, this one is good
  				boundaries = offsets;
  			}
  		}
  
  		// Add paddings
  		padding = padding || 0;
  		var isPaddingNumber = typeof padding === 'number';
  		boundaries.left += isPaddingNumber ? padding : padding.left || 0;
  		boundaries.top += isPaddingNumber ? padding : padding.top || 0;
  		boundaries.right -= isPaddingNumber ? padding : padding.right || 0;
  		boundaries.bottom -= isPaddingNumber ? padding : padding.bottom || 0;
  
  		return boundaries;
  	}
  
  	function getArea(_ref) {
  		var width = _ref.width,
  			height = _ref.height;
  
  		return width * height;
  	}
  
  	/**
  	 * Utility used to transform the `auto` placement to the placement with more
  	 * available space.
  	 * @method
  	 * @memberof Popper.Utils
  	 * @argument {Object} data - The data object generated by update method
  	 * @argument {Object} options - Modifiers configuration and options
  	 * @returns {Object} The data object, properly modified
  	 */
  	function computeAutoPlacement(placement, refRect, popper, reference, boundariesElement) {
  		var padding = arguments.length > 5 && arguments[5] !== undefined ? arguments[5] : 0;
  
  		if (placement.indexOf('auto') === -1) {
  			return placement;
  		}
  
  		var boundaries = getBoundaries(popper, reference, padding, boundariesElement);
  
  		var rects = {
  			top: {
  				width: boundaries.width,
  				height: refRect.top - boundaries.top
  			},
  			right: {
  				width: boundaries.right - refRect.right,
  				height: boundaries.height
  			},
  			bottom: {
  				width: boundaries.width,
  				height: boundaries.bottom - refRect.bottom
  			},
  			left: {
  				width: refRect.left - boundaries.left,
  				height: boundaries.height
  			}
  		};
  
  		var sortedAreas = Object.keys(rects).map(function (key) {
  			return _extends({
  				key: key
  			}, rects[key], {
  				area: getArea(rects[key])
  			});
  		}).sort(function (a, b) {
  			return b.area - a.area;
  		});
  
  		var filteredAreas = sortedAreas.filter(function (_ref2) {
  			var width = _ref2.width,
  				height = _ref2.height;
  			return width >= popper.clientWidth && height >= popper.clientHeight;
  		});
  
  		var computedPlacement = filteredAreas.length > 0 ? filteredAreas[0].key : sortedAreas[0].key;
  
  		var variation = placement.split('-')[1];
  
  		return computedPlacement + (variation ? '-' + variation : '');
  	}
  
  	/**
  	 * Get offsets to the reference element
  	 * @method
  	 * @memberof Popper.Utils
  	 * @param {Object} state
  	 * @param {Element} popper - the popper element
  	 * @param {Element} reference - the reference element (the popper will be relative to this)
  	 * @param {Element} fixedPosition - is in fixed position mode
  	 * @returns {Object} An object containing the offsets which will be applied to the popper
  	 */
  	function getReferenceOffsets(state, popper, reference) {
  		var fixedPosition = arguments.length > 3 && arguments[3] !== undefined ? arguments[3] : null;
  
  		var commonOffsetParent = fixedPosition ? getFixedPositionOffsetParent(popper) : findCommonOffsetParent(popper, reference);
  		return getOffsetRectRelativeToArbitraryNode(reference, commonOffsetParent, fixedPosition);
  	}
  
  	/**
  	 * Get the outer sizes of the given element (offset size + margins)
  	 * @method
  	 * @memberof Popper.Utils
  	 * @argument {Element} element
  	 * @returns {Object} object containing width and height properties
  	 */
  	function getOuterSizes(element) {
  		var window = element.ownerDocument.defaultView;
  		var styles = window.getComputedStyle(element);
  		var x = parseFloat(styles.marginTop) + parseFloat(styles.marginBottom);
  		var y = parseFloat(styles.marginLeft) + parseFloat(styles.marginRight);
  		var result = {
  			width: element.offsetWidth + y,
  			height: element.offsetHeight + x
  		};
  		return result;
  	}
  
  	/**
  	 * Get the opposite placement of the given one
  	 * @method
  	 * @memberof Popper.Utils
  	 * @argument {String} placement
  	 * @returns {String} flipped placement
  	 */
  	function getOppositePlacement(placement) {
  		var hash = { left: 'right', right: 'left', bottom: 'top', top: 'bottom' };
  		return placement.replace(/left|right|bottom|top/g, function (matched) {
  			return hash[matched];
  		});
  	}
  
  	/**
  	 * Get offsets to the popper
  	 * @method
  	 * @memberof Popper.Utils
  	 * @param {Object} position - CSS position the Popper will get applied
  	 * @param {HTMLElement} popper - the popper element
  	 * @param {Object} referenceOffsets - the reference offsets (the popper will be relative to this)
  	 * @param {String} placement - one of the valid placement options
  	 * @returns {Object} popperOffsets - An object containing the offsets which will be applied to the popper
  	 */
  	function getPopperOffsets(popper, referenceOffsets, placement) {
  		placement = placement.split('-')[0];
  
  		// Get popper node sizes
  		var popperRect = getOuterSizes(popper);
  
  		// Add position, width and height to our offsets object
  		var popperOffsets = {
  			width: popperRect.width,
  			height: popperRect.height
  		};
  
  		// depending by the popper placement we have to compute its offsets slightly differently
  		var isHoriz = ['right', 'left'].indexOf(placement) !== -1;
  		var mainSide = isHoriz ? 'top' : 'left';
  		var secondarySide = isHoriz ? 'left' : 'top';
  		var measurement = isHoriz ? 'height' : 'width';
  		var secondaryMeasurement = !isHoriz ? 'height' : 'width';
  
  		popperOffsets[mainSide] = referenceOffsets[mainSide] + referenceOffsets[measurement] / 2 - popperRect[measurement] / 2;
  		if (placement === secondarySide) {
  			popperOffsets[secondarySide] = referenceOffsets[secondarySide] - popperRect[secondaryMeasurement];
  		} else {
  			popperOffsets[secondarySide] = referenceOffsets[getOppositePlacement(secondarySide)];
  		}
  
  		return popperOffsets;
  	}
  
  	/**
  	 * Mimics the `find` method of Array
  	 * @method
  	 * @memberof Popper.Utils
  	 * @argument {Array} arr
  	 * @argument prop
  	 * @argument value
  	 * @returns index or -1
  	 */
  	function find(arr, check) {
  		// use native find if supported
  		if (Array.prototype.find) {
  			return arr.find(check);
  		}
  
  		// use `filter` to obtain the same behavior of `find`
  		return arr.filter(check)[0];
  	}
  
  	/**
  	 * Return the index of the matching object
  	 * @method
  	 * @memberof Popper.Utils
  	 * @argument {Array} arr
  	 * @argument prop
  	 * @argument value
  	 * @returns index or -1
  	 */
  	function findIndex(arr, prop, value) {
  		// use native findIndex if supported
  		if (Array.prototype.findIndex) {
  			return arr.findIndex(function (cur) {
  				return cur[prop] === value;
  			});
  		}
  
  		// use `find` + `indexOf` if `findIndex` isn't supported
  		var match = find(arr, function (obj) {
  			return obj[prop] === value;
  		});
  		return arr.indexOf(match);
  	}
  
  	/**
  	 * Loop trough the list of modifiers and run them in order,
  	 * each of them will then edit the data object.
  	 * @method
  	 * @memberof Popper.Utils
  	 * @param {dataObject} data
  	 * @param {Array} modifiers
  	 * @param {String} ends - Optional modifier name used as stopper
  	 * @returns {dataObject}
  	 */
  	function runModifiers(modifiers, data, ends) {
  		var modifiersToRun = ends === undefined ? modifiers : modifiers.slice(0, findIndex(modifiers, 'name', ends));
  
  		modifiersToRun.forEach(function (modifier) {
  			if (modifier['function']) {
  				// eslint-disable-line dot-notation
  				console.warn('`modifier.function` is deprecated, use `modifier.fn`!');
  			}
  			var fn = modifier['function'] || modifier.fn; // eslint-disable-line dot-notation
  			if (modifier.enabled && isFunction(fn)) {
  				// Add properties to offsets to make them a complete clientRect object
  				// we do this before each modifier to make sure the previous one doesn't
  				// mess with these values
  				data.offsets.popper = getClientRect(data.offsets.popper);
  				data.offsets.reference = getClientRect(data.offsets.reference);
  
  				data = fn(data, modifier);
  			}
  		});
  
  		return data;
  	}
  
  	/**
  	 * Updates the position of the popper, computing the new offsets and applying
  	 * the new style.<br />
  	 * Prefer `scheduleUpdate` over `update` because of performance reasons.
  	 * @method
  	 * @memberof Popper
  	 */
  	function update() {
  		// if popper is destroyed, don't perform any further update
  		if (this.state.isDestroyed) {
  			return;
  		}
  
  		var data = {
  			instance: this,
  			styles: {},
  			arrowStyles: {},
  			attributes: {},
  			flipped: false,
  			offsets: {}
  		};
  
  		// compute reference element offsets
  		data.offsets.reference = getReferenceOffsets(this.state, this.popper, this.reference, this.options.positionFixed);
  
  		// compute auto placement, store placement inside the data object,
  		// modifiers will be able to edit `placement` if needed
  		// and refer to originalPlacement to know the original value
  		data.placement = computeAutoPlacement(this.options.placement, data.offsets.reference, this.popper, this.reference, this.options.modifiers.flip.boundariesElement, this.options.modifiers.flip.padding);
  
  		// store the computed placement inside `originalPlacement`
  		data.originalPlacement = data.placement;
  
  		data.positionFixed = this.options.positionFixed;
  
  		// compute the popper offsets
  		data.offsets.popper = getPopperOffsets(this.popper, data.offsets.reference, data.placement);
  
  		data.offsets.popper.position = this.options.positionFixed ? 'fixed' : 'absolute';
  
  		// run the modifiers
  		data = runModifiers(this.modifiers, data);
  
  		// the first `update` will call `onCreate` callback
  		// the other ones will call `onUpdate` callback
  		if (!this.state.isCreated) {
  			this.state.isCreated = true;
  			this.options.onCreate(data);
  		} else {
  			this.options.onUpdate(data);
  		}
  	}
  
  	/**
  	 * Helper used to know if the given modifier is enabled.
  	 * @method
  	 * @memberof Popper.Utils
  	 * @returns {Boolean}
  	 */
  	function isModifierEnabled(modifiers, modifierName) {
  		return modifiers.some(function (_ref) {
  			var name = _ref.name,
  				enabled = _ref.enabled;
  			return enabled && name === modifierName;
  		});
  	}
  
  	/**
  	 * Get the prefixed supported property name
  	 * @method
  	 * @memberof Popper.Utils
  	 * @argument {String} property (camelCase)
  	 * @returns {String} prefixed property (camelCase or PascalCase, depending on the vendor prefix)
  	 */
  	function getSupportedPropertyName(property) {
  		var prefixes = [false, 'ms', 'Webkit', 'Moz', 'O'];
  		var upperProp = property.charAt(0).toUpperCase() + property.slice(1);
  
  		for (var i = 0; i < prefixes.length; i++) {
  			var prefix = prefixes[i];
  			var toCheck = prefix ? '' + prefix + upperProp : property;
  			if (typeof document.body.style[toCheck] !== 'undefined') {
  				return toCheck;
  			}
  		}
  		return null;
  	}
  
  	/**
  	 * Destroys the popper.
  	 * @method
  	 * @memberof Popper
  	 */
  	function destroy() {
  		this.state.isDestroyed = true;
  
  		// touch DOM only if `applyStyle` modifier is enabled
  		if (isModifierEnabled(this.modifiers, 'applyStyle')) {
  			this.popper.removeAttribute('x-placement');
  			this.popper.style.position = '';
  			this.popper.style.top = '';
  			this.popper.style.left = '';
  			this.popper.style.right = '';
  			this.popper.style.bottom = '';
  			this.popper.style.willChange = '';
  			this.popper.style[getSupportedPropertyName('transform')] = '';
  		}
  
  		this.disableEventListeners();
  
  		// remove the popper if user explicity asked for the deletion on destroy
  		// do not use `remove` because IE11 doesn't support it
  		if (this.options.removeOnDestroy) {
  			this.popper.parentNode.removeChild(this.popper);
  		}
  		return this;
  	}
  
  	/**
  	 * Get the window associated with the element
  	 * @argument {Element} element
  	 * @returns {Window}
  	 */
  	function getWindow(element) {
  		var ownerDocument = element.ownerDocument;
  		return ownerDocument ? ownerDocument.defaultView : window;
  	}
  
  	function attachToScrollParents(scrollParent, event, callback, scrollParents) {
  		var isBody = scrollParent.nodeName === 'BODY';
  		var target = isBody ? scrollParent.ownerDocument.defaultView : scrollParent;
  		target.addEventListener(event, callback, { passive: true });
  
  		if (!isBody) {
  			attachToScrollParents(getScrollParent(target.parentNode), event, callback, scrollParents);
  		}
  		scrollParents.push(target);
  	}
  
  	/**
  	 * Setup needed event listeners used to update the popper position
  	 * @method
  	 * @memberof Popper.Utils
  	 * @private
  	 */
  	function setupEventListeners(reference, options, state, updateBound) {
  		// Resize event listener on window
  		state.updateBound = updateBound;
  		getWindow(reference).addEventListener('resize', state.updateBound, { passive: true });
  
  		// Scroll event listener on scroll parents
  		var scrollElement = getScrollParent(reference);
  		attachToScrollParents(scrollElement, 'scroll', state.updateBound, state.scrollParents);
  		state.scrollElement = scrollElement;
  		state.eventsEnabled = true;
  
  		return state;
  	}
  
  	/**
  	 * It will add resize/scroll events and start recalculating
  	 * position of the popper element when they are triggered.
  	 * @method
  	 * @memberof Popper
  	 */
  	function enableEventListeners() {
  		if (!this.state.eventsEnabled) {
  			this.state = setupEventListeners(this.reference, this.options, this.state, this.scheduleUpdate);
  		}
  	}
  
  	/**
  	 * Remove event listeners used to update the popper position
  	 * @method
  	 * @memberof Popper.Utils
  	 * @private
  	 */
  	function removeEventListeners(reference, state) {
  		// Remove resize event listener on window
  		getWindow(reference).removeEventListener('resize', state.updateBound);
  
  		// Remove scroll event listener on scroll parents
  		state.scrollParents.forEach(function (target) {
  			target.removeEventListener('scroll', state.updateBound);
  		});
  
  		// Reset state
  		state.updateBound = null;
  		state.scrollParents = [];
  		state.scrollElement = null;
  		state.eventsEnabled = false;
  		return state;
  	}
  
  	/**
  	 * It will remove resize/scroll events and won't recalculate popper position
  	 * when they are triggered. It also won't trigger `onUpdate` callback anymore,
  	 * unless you call `update` method manually.
  	 * @method
  	 * @memberof Popper
  	 */
  	function disableEventListeners() {
  		if (this.state.eventsEnabled) {
  			cancelAnimationFrame(this.scheduleUpdate);
  			this.state = removeEventListeners(this.reference, this.state);
  		}
  	}
  
  	/**
  	 * Tells if a given input is a number
  	 * @method
  	 * @memberof Popper.Utils
  	 * @param {*} input to check
  	 * @return {Boolean}
  	 */
  	function isNumeric(n) {
  		return n !== '' && !isNaN(parseFloat(n)) && isFinite(n);
  	}
  
  	/**
  	 * Set the style to the given popper
  	 * @method
  	 * @memberof Popper.Utils
  	 * @argument {Element} element - Element to apply the style to
  	 * @argument {Object} styles
  	 * Object with a list of properties and values which will be applied to the element
  	 */
  	function setStyles(element, styles) {
  		Object.keys(styles).forEach(function (prop) {
  			var unit = '';
  			// add unit if the value is numeric and is one of the following
  			if (['width', 'height', 'top', 'right', 'bottom', 'left'].indexOf(prop) !== -1 && isNumeric(styles[prop])) {
  				unit = 'px';
  			}
  			element.style[prop] = styles[prop] + unit;
  		});
  	}
  
  	/**
  	 * Set the attributes to the given popper
  	 * @method
  	 * @memberof Popper.Utils
  	 * @argument {Element} element - Element to apply the attributes to
  	 * @argument {Object} styles
  	 * Object with a list of properties and values which will be applied to the element
  	 */
  	function setAttributes(element, attributes) {
  		Object.keys(attributes).forEach(function (prop) {
  			var value = attributes[prop];
  			if (value !== false) {
  				element.setAttribute(prop, attributes[prop]);
  			} else {
  				element.removeAttribute(prop);
  			}
  		});
  	}
  
  	/**
  	 * @function
  	 * @memberof Modifiers
  	 * @argument {Object} data - The data object generated by `update` method
  	 * @argument {Object} data.styles - List of style properties - values to apply to popper element
  	 * @argument {Object} data.attributes - List of attribute properties - values to apply to popper element
  	 * @argument {Object} options - Modifiers configuration and options
  	 * @returns {Object} The same data object
  	 */
  	function applyStyle(data) {
  		// any property present in `data.styles` will be applied to the popper,
  		// in this way we can make the 3rd party modifiers add custom styles to it
  		// Be aware, modifiers could override the properties defined in the previous
  		// lines of this modifier!
  		setStyles(data.instance.popper, data.styles);
  
  		// any property present in `data.attributes` will be applied to the popper,
  		// they will be set as HTML attributes of the element
  		setAttributes(data.instance.popper, data.attributes);
  
  		// if arrowElement is defined and arrowStyles has some properties
  		if (data.arrowElement && Object.keys(data.arrowStyles).length) {
  			setStyles(data.arrowElement, data.arrowStyles);
  		}
  
  		return data;
  	}
  
  	/**
  	 * Set the x-placement attribute before everything else because it could be used
  	 * to add margins to the popper margins needs to be calculated to get the
  	 * correct popper offsets.
  	 * @method
  	 * @memberof Popper.modifiers
  	 * @param {HTMLElement} reference - The reference element used to position the popper
  	 * @param {HTMLElement} popper - The HTML element used as popper
  	 * @param {Object} options - Popper.js options
  	 */
  	function applyStyleOnLoad(reference, popper, options, modifierOptions, state) {
  		// compute reference element offsets
  		var referenceOffsets = getReferenceOffsets(state, popper, reference, options.positionFixed);
  
  		// compute auto placement, store placement inside the data object,
  		// modifiers will be able to edit `placement` if needed
  		// and refer to originalPlacement to know the original value
  		var placement = computeAutoPlacement(options.placement, referenceOffsets, popper, reference, options.modifiers.flip.boundariesElement, options.modifiers.flip.padding);
  
  		popper.setAttribute('x-placement', placement);
  
  		// Apply `position` to popper before anything else because
  		// without the position applied we can't guarantee correct computations
  		setStyles(popper, { position: options.positionFixed ? 'fixed' : 'absolute' });
  
  		return options;
  	}
  
  	/**
  	 * @function
  	 * @memberof Modifiers
  	 * @argument {Object} data - The data object generated by `update` method
  	 * @argument {Object} options - Modifiers configuration and options
  	 * @returns {Object} The data object, properly modified
  	 */
  	function computeStyle(data, options) {
  		var x = options.x,
  			y = options.y;
  		var popper = data.offsets.popper;
  
  		// Remove this legacy support in Popper.js v2
  
  		var legacyGpuAccelerationOption = find(data.instance.modifiers, function (modifier) {
  			return modifier.name === 'applyStyle';
  		}).gpuAcceleration;
  		if (legacyGpuAccelerationOption !== undefined) {
  			console.warn('WARNING: `gpuAcceleration` option moved to `computeStyle` modifier and will not be supported in future versions of Popper.js!');
  		}
  		var gpuAcceleration = legacyGpuAccelerationOption !== undefined ? legacyGpuAccelerationOption : options.gpuAcceleration;
  
  		var offsetParent = getOffsetParent(data.instance.popper);
  		var offsetParentRect = getBoundingClientRect(offsetParent);
  
  		// Styles
  		var styles = {
  			position: popper.position
  		};
  
  		// Avoid blurry text by using full pixel integers.
  		// For pixel-perfect positioning, top/bottom prefers rounded
  		// values, while left/right prefers floored values.
  		var offsets = {
  			left: Math.floor(popper.left),
  			top: Math.round(popper.top),
  			bottom: Math.round(popper.bottom),
  			right: Math.floor(popper.right)
  		};
  
  		var sideA = x === 'bottom' ? 'top' : 'bottom';
  		var sideB = y === 'right' ? 'left' : 'right';
  
  		// if gpuAcceleration is set to `true` and transform is supported,
  		//  we use `translate3d` to apply the position to the popper we
  		// automatically use the supported prefixed version if needed
  		var prefixedProperty = getSupportedPropertyName('transform');
  
  		// now, let's make a step back and look at this code closely (wtf?)
  		// If the content of the popper grows once it's been positioned, it
  		// may happen that the popper gets misplaced because of the new content
  		// overflowing its reference element
  		// To avoid this problem, we provide two options (x and y), which allow
  		// the consumer to define the offset origin.
  		// If we position a popper on top of a reference element, we can set
  		// `x` to `top` to make the popper grow towards its top instead of
  		// its bottom.
  		var left = void 0,
  			top = void 0;
  		if (sideA === 'bottom') {
  			// when offsetParent is <html> the positioning is relative to the bottom of the screen (excluding the scrollbar)
  			// and not the bottom of the html element
  			if (offsetParent.nodeName === 'HTML') {
  				top = -offsetParent.clientHeight + offsets.bottom;
  			} else {
  				top = -offsetParentRect.height + offsets.bottom;
  			}
  		} else {
  			top = offsets.top;
  		}
  		if (sideB === 'right') {
  			if (offsetParent.nodeName === 'HTML') {
  				left = -offsetParent.clientWidth + offsets.right;
  			} else {
  				left = -offsetParentRect.width + offsets.right;
  			}
  		} else {
  			left = offsets.left;
  		}
  		if (gpuAcceleration && prefixedProperty) {
  			styles[prefixedProperty] = 'translate3d(' + left + 'px, ' + top + 'px, 0)';
  			styles[sideA] = 0;
  			styles[sideB] = 0;
  			styles.willChange = 'transform';
  		} else {
  			// othwerise, we use the standard `top`, `left`, `bottom` and `right` properties
  			var invertTop = sideA === 'bottom' ? -1 : 1;
  			var invertLeft = sideB === 'right' ? -1 : 1;
  			styles[sideA] = top * invertTop;
  			styles[sideB] = left * invertLeft;
  			styles.willChange = sideA + ', ' + sideB;
  		}
  
  		// Attributes
  		var attributes = {
  			'x-placement': data.placement
  		};
  
  		// Update `data` attributes, styles and arrowStyles
  		data.attributes = _extends({}, attributes, data.attributes);
  		data.styles = _extends({}, styles, data.styles);
  		data.arrowStyles = _extends({}, data.offsets.arrow, data.arrowStyles);
  
  		return data;
  	}
  
  	/**
  	 * Helper used to know if the given modifier depends from another one.<br />
  	 * It checks if the needed modifier is listed and enabled.
  	 * @method
  	 * @memberof Popper.Utils
  	 * @param {Array} modifiers - list of modifiers
  	 * @param {String} requestingName - name of requesting modifier
  	 * @param {String} requestedName - name of requested modifier
  	 * @returns {Boolean}
  	 */
  	function isModifierRequired(modifiers, requestingName, requestedName) {
  		var requesting = find(modifiers, function (_ref) {
  			var name = _ref.name;
  			return name === requestingName;
  		});
  
  		var isRequired = !!requesting && modifiers.some(function (modifier) {
  			return modifier.name === requestedName && modifier.enabled && modifier.order < requesting.order;
  		});
  
  		if (!isRequired) {
  			var _requesting = '`' + requestingName + '`';
  			var requested = '`' + requestedName + '`';
  			console.warn(requested + ' modifier is required by ' + _requesting + ' modifier in order to work, be sure to include it before ' + _requesting + '!');
  		}
  		return isRequired;
  	}
  
  	/**
  	 * @function
  	 * @memberof Modifiers
  	 * @argument {Object} data - The data object generated by update method
  	 * @argument {Object} options - Modifiers configuration and options
  	 * @returns {Object} The data object, properly modified
  	 */
  	function arrow(data, options) {
  		var _data$offsets$arrow;
  
  		// arrow depends on keepTogether in order to work
  		if (!isModifierRequired(data.instance.modifiers, 'arrow', 'keepTogether')) {
  			return data;
  		}
  
  		var arrowElement = options.element;
  
  		// if arrowElement is a string, suppose it's a CSS selector
  		if (typeof arrowElement === 'string') {
  			arrowElement = data.instance.popper.querySelector(arrowElement);
  
  			// if arrowElement is not found, don't run the modifier
  			if (!arrowElement) {
  				return data;
  			}
  		} else {
  			// if the arrowElement isn't a query selector we must check that the
  			// provided DOM node is child of its popper node
  			if (!data.instance.popper.contains(arrowElement)) {
  				console.warn('WARNING: `arrow.element` must be child of its popper element!');
  				return data;
  			}
  		}
  
  		var placement = data.placement.split('-')[0];
  		var _data$offsets = data.offsets,
  			popper = _data$offsets.popper,
  			reference = _data$offsets.reference;
  
  		var isVertical = ['left', 'right'].indexOf(placement) !== -1;
  
  		var len = isVertical ? 'height' : 'width';
  		var sideCapitalized = isVertical ? 'Top' : 'Left';
  		var side = sideCapitalized.toLowerCase();
  		var altSide = isVertical ? 'left' : 'top';
  		var opSide = isVertical ? 'bottom' : 'right';
  		var arrowElementSize = getOuterSizes(arrowElement)[len];
  
  		//
  		// extends keepTogether behavior making sure the popper and its
  		// reference have enough pixels in conjunction
  		//
  
  		// top/left side
  		if (reference[opSide] - arrowElementSize < popper[side]) {
  			data.offsets.popper[side] -= popper[side] - (reference[opSide] - arrowElementSize);
  		}
  		// bottom/right side
  		if (reference[side] + arrowElementSize > popper[opSide]) {
  			data.offsets.popper[side] += reference[side] + arrowElementSize - popper[opSide];
  		}
  		data.offsets.popper = getClientRect(data.offsets.popper);
  
  		// compute center of the popper
  		var center = reference[side] + reference[len] / 2 - arrowElementSize / 2;
  
  		// Compute the sideValue using the updated popper offsets
  		// take popper margin in account because we don't have this info available
  		var css = getStyleComputedProperty(data.instance.popper);
  		var popperMarginSide = parseFloat(css['margin' + sideCapitalized], 10);
  		var popperBorderSide = parseFloat(css['border' + sideCapitalized + 'Width'], 10);
  		var sideValue = center - data.offsets.popper[side] - popperMarginSide - popperBorderSide;
  
  		// prevent arrowElement from being placed not contiguously to its popper
  		sideValue = Math.max(Math.min(popper[len] - arrowElementSize, sideValue), 0);
  
  		data.arrowElement = arrowElement;
  		data.offsets.arrow = (_data$offsets$arrow = {}, defineProperty(_data$offsets$arrow, side, Math.round(sideValue)), defineProperty(_data$offsets$arrow, altSide, ''), _data$offsets$arrow);
  
  		return data;
  	}
  
  	/**
  	 * Get the opposite placement variation of the given one
  	 * @method
  	 * @memberof Popper.Utils
  	 * @argument {String} placement variation
  	 * @returns {String} flipped placement variation
  	 */
  	function getOppositeVariation(variation) {
  		if (variation === 'end') {
  			return 'start';
  		} else if (variation === 'start') {
  			return 'end';
  		}
  		return variation;
  	}
  
  	/**
  	 * List of accepted placements to use as values of the `placement` option.<br />
  	 * Valid placements are:
  	 * - `auto`
  	 * - `top`
  	 * - `right`
  	 * - `bottom`
  	 * - `left`
  	 *
  	 * Each placement can have a variation from this list:
  	 * - `-start`
  	 * - `-end`
  	 *
  	 * Variations are interpreted easily if you think of them as the left to right
  	 * written languages. Horizontally (`top` and `bottom`), `start` is left and `end`
  	 * is right.<br />
  	 * Vertically (`left` and `right`), `start` is top and `end` is bottom.
  	 *
  	 * Some valid examples are:
  	 * - `top-end` (on top of reference, right aligned)
  	 * - `right-start` (on right of reference, top aligned)
  	 * - `bottom` (on bottom, centered)
  	 * - `auto-end` (on the side with more space available, alignment depends by placement)
  	 *
  	 * @static
  	 * @type {Array}
  	 * @enum {String}
  	 * @readonly
  	 * @method placements
  	 * @memberof Popper
  	 */
  	var placements = ['auto-start', 'auto', 'auto-end', 'top-start', 'top', 'top-end', 'right-start', 'right', 'right-end', 'bottom-end', 'bottom', 'bottom-start', 'left-end', 'left', 'left-start'];
  
  // Get rid of `auto` `auto-start` and `auto-end`
  	var validPlacements = placements.slice(3);
  
  	/**
  	 * Given an initial placement, returns all the subsequent placements
  	 * clockwise (or counter-clockwise).
  	 *
  	 * @method
  	 * @memberof Popper.Utils
  	 * @argument {String} placement - A valid placement (it accepts variations)
  	 * @argument {Boolean} counter - Set to true to walk the placements counterclockwise
  	 * @returns {Array} placements including their variations
  	 */
  	function clockwise(placement) {
  		var counter = arguments.length > 1 && arguments[1] !== undefined ? arguments[1] : false;
  
  		var index = validPlacements.indexOf(placement);
  		var arr = validPlacements.slice(index + 1).concat(validPlacements.slice(0, index));
  		return counter ? arr.reverse() : arr;
  	}
  
  	var BEHAVIORS = {
  		FLIP: 'flip',
  		CLOCKWISE: 'clockwise',
  		COUNTERCLOCKWISE: 'counterclockwise'
  	};
  
  	/**
  	 * @function
  	 * @memberof Modifiers
  	 * @argument {Object} data - The data object generated by update method
  	 * @argument {Object} options - Modifiers configuration and options
  	 * @returns {Object} The data object, properly modified
  	 */
  	function flip(data, options) {
  		// if `inner` modifier is enabled, we can't use the `flip` modifier
  		if (isModifierEnabled(data.instance.modifiers, 'inner')) {
  			return data;
  		}
  
  		if (data.flipped && data.placement === data.originalPlacement) {
  			// seems like flip is trying to loop, probably there's not enough space on any of the flippable sides
  			return data;
  		}
  
  		var boundaries = getBoundaries(data.instance.popper, data.instance.reference, options.padding, options.boundariesElement, data.positionFixed);
  
  		var placement = data.placement.split('-')[0];
  		var placementOpposite = getOppositePlacement(placement);
  		var variation = data.placement.split('-')[1] || '';
  
  		var flipOrder = [];
  
  		switch (options.behavior) {
  			case BEHAVIORS.FLIP:
  				flipOrder = [placement, placementOpposite];
  				break;
  			case BEHAVIORS.CLOCKWISE:
  				flipOrder = clockwise(placement);
  				break;
  			case BEHAVIORS.COUNTERCLOCKWISE:
  				flipOrder = clockwise(placement, true);
  				break;
  			default:
  				flipOrder = options.behavior;
  		}
  
  		flipOrder.forEach(function (step, index) {
  			if (placement !== step || flipOrder.length === index + 1) {
  				return data;
  			}
  
  			placement = data.placement.split('-')[0];
  			placementOpposite = getOppositePlacement(placement);
  
  			var popperOffsets = data.offsets.popper;
  			var refOffsets = data.offsets.reference;
  
  			// using floor because the reference offsets may contain decimals we are not going to consider here
  			var floor = Math.floor;
  			var overlapsRef = placement === 'left' && floor(popperOffsets.right) > floor(refOffsets.left) || placement === 'right' && floor(popperOffsets.left) < floor(refOffsets.right) || placement === 'top' && floor(popperOffsets.bottom) > floor(refOffsets.top) || placement === 'bottom' && floor(popperOffsets.top) < floor(refOffsets.bottom);
  
  			var overflowsLeft = floor(popperOffsets.left) < floor(boundaries.left);
  			var overflowsRight = floor(popperOffsets.right) > floor(boundaries.right);
  			var overflowsTop = floor(popperOffsets.top) < floor(boundaries.top);
  			var overflowsBottom = floor(popperOffsets.bottom) > floor(boundaries.bottom);
  
  			var overflowsBoundaries = placement === 'left' && overflowsLeft || placement === 'right' && overflowsRight || placement === 'top' && overflowsTop || placement === 'bottom' && overflowsBottom;
  
  			// flip the variation if required
  			var isVertical = ['top', 'bottom'].indexOf(placement) !== -1;
  			var flippedVariation = !!options.flipVariations && (isVertical && variation === 'start' && overflowsLeft || isVertical && variation === 'end' && overflowsRight || !isVertical && variation === 'start' && overflowsTop || !isVertical && variation === 'end' && overflowsBottom);
  
  			if (overlapsRef || overflowsBoundaries || flippedVariation) {
  				// this boolean to detect any flip loop
  				data.flipped = true;
  
  				if (overlapsRef || overflowsBoundaries) {
  					placement = flipOrder[index + 1];
  				}
  
  				if (flippedVariation) {
  					variation = getOppositeVariation(variation);
  				}
  
  				data.placement = placement + (variation ? '-' + variation : '');
  
  				// this object contains `position`, we want to preserve it along with
  				// any additional property we may add in the future
  				data.offsets.popper = _extends({}, data.offsets.popper, getPopperOffsets(data.instance.popper, data.offsets.reference, data.placement));
  
  				data = runModifiers(data.instance.modifiers, data, 'flip');
  			}
  		});
  		return data;
  	}
  
  	/**
  	 * @function
  	 * @memberof Modifiers
  	 * @argument {Object} data - The data object generated by update method
  	 * @argument {Object} options - Modifiers configuration and options
  	 * @returns {Object} The data object, properly modified
  	 */
  	function keepTogether(data) {
  		var _data$offsets = data.offsets,
  			popper = _data$offsets.popper,
  			reference = _data$offsets.reference;
  
  		var placement = data.placement.split('-')[0];
  		var floor = Math.floor;
  		var isVertical = ['top', 'bottom'].indexOf(placement) !== -1;
  		var side = isVertical ? 'right' : 'bottom';
  		var opSide = isVertical ? 'left' : 'top';
  		var measurement = isVertical ? 'width' : 'height';
  
  		if (popper[side] < floor(reference[opSide])) {
  			data.offsets.popper[opSide] = floor(reference[opSide]) - popper[measurement];
  		}
  		if (popper[opSide] > floor(reference[side])) {
  			data.offsets.popper[opSide] = floor(reference[side]);
  		}
  
  		return data;
  	}
  
  	/**
  	 * Converts a string containing value + unit into a px value number
  	 * @function
  	 * @memberof {modifiers~offset}
  	 * @private
  	 * @argument {String} str - Value + unit string
  	 * @argument {String} measurement - `height` or `width`
  	 * @argument {Object} popperOffsets
  	 * @argument {Object} referenceOffsets
  	 * @returns {Number|String}
  	 * Value in pixels, or original string if no values were extracted
  	 */
  	function toValue(str, measurement, popperOffsets, referenceOffsets) {
  		// separate value from unit
  		var split = str.match(/((?:\-|\+)?\d*\.?\d*)(.*)/);
  		var value = +split[1];
  		var unit = split[2];
  
  		// If it's not a number it's an operator, I guess
  		if (!value) {
  			return str;
  		}
  
  		if (unit.indexOf('%') === 0) {
  			var element = void 0;
  			switch (unit) {
  				case '%p':
  					element = popperOffsets;
  					break;
  				case '%':
  				case '%r':
  				default:
  					element = referenceOffsets;
  			}
  
  			var rect = getClientRect(element);
  			return rect[measurement] / 100 * value;
  		} else if (unit === 'vh' || unit === 'vw') {
  			// if is a vh or vw, we calculate the size based on the viewport
  			var size = void 0;
  			if (unit === 'vh') {
  				size = Math.max(document.documentElement.clientHeight, window.innerHeight || 0);
  			} else {
  				size = Math.max(document.documentElement.clientWidth, window.innerWidth || 0);
  			}
  			return size / 100 * value;
  		} else {
  			// if is an explicit pixel unit, we get rid of the unit and keep the value
  			// if is an implicit unit, it's px, and we return just the value
  			return value;
  		}
  	}
  
  	/**
  	 * Parse an `offset` string to extrapolate `x` and `y` numeric offsets.
  	 * @function
  	 * @memberof {modifiers~offset}
  	 * @private
  	 * @argument {String} offset
  	 * @argument {Object} popperOffsets
  	 * @argument {Object} referenceOffsets
  	 * @argument {String} basePlacement
  	 * @returns {Array} a two cells array with x and y offsets in numbers
  	 */
  	function parseOffset(offset, popperOffsets, referenceOffsets, basePlacement) {
  		var offsets = [0, 0];
  
  		// Use height if placement is left or right and index is 0 otherwise use width
  		// in this way the first offset will use an axis and the second one
  		// will use the other one
  		var useHeight = ['right', 'left'].indexOf(basePlacement) !== -1;
  
  		// Split the offset string to obtain a list of values and operands
  		// The regex addresses values with the plus or minus sign in front (+10, -20, etc)
  		var fragments = offset.split(/(\+|\-)/).map(function (frag) {
  			return frag.trim();
  		});
  
  		// Detect if the offset string contains a pair of values or a single one
  		// they could be separated by comma or space
  		var divider = fragments.indexOf(find(fragments, function (frag) {
  			return frag.search(/,|\s/) !== -1;
  		}));
  
  		if (fragments[divider] && fragments[divider].indexOf(',') === -1) {
  			console.warn('Offsets separated by white space(s) are deprecated, use a comma (,) instead.');
  		}
  
  		// If divider is found, we divide the list of values and operands to divide
  		// them by ofset X and Y.
  		var splitRegex = /\s*,\s*|\s+/;
  		var ops = divider !== -1 ? [fragments.slice(0, divider).concat([fragments[divider].split(splitRegex)[0]]), [fragments[divider].split(splitRegex)[1]].concat(fragments.slice(divider + 1))] : [fragments];
  
  		// Convert the values with units to absolute pixels to allow our computations
  		ops = ops.map(function (op, index) {
  			// Most of the units rely on the orientation of the popper
  			var measurement = (index === 1 ? !useHeight : useHeight) ? 'height' : 'width';
  			var mergeWithPrevious = false;
  			return op
  			// This aggregates any `+` or `-` sign that aren't considered operators
  			// e.g.: 10 + +5 => [10, +, +5]
  				.reduce(function (a, b) {
  					if (a[a.length - 1] === '' && ['+', '-'].indexOf(b) !== -1) {
  						a[a.length - 1] = b;
  						mergeWithPrevious = true;
  						return a;
  					} else if (mergeWithPrevious) {
  						a[a.length - 1] += b;
  						mergeWithPrevious = false;
  						return a;
  					} else {
  						return a.concat(b);
  					}
  				}, [])
  				// Here we convert the string values into number values (in px)
  				.map(function (str) {
  					return toValue(str, measurement, popperOffsets, referenceOffsets);
  				});
  		});
  
  		// Loop trough the offsets arrays and execute the operations
  		ops.forEach(function (op, index) {
  			op.forEach(function (frag, index2) {
  				if (isNumeric(frag)) {
  					offsets[index] += frag * (op[index2 - 1] === '-' ? -1 : 1);
  				}
  			});
  		});
  		return offsets;
  	}
  
  	/**
  	 * @function
  	 * @memberof Modifiers
  	 * @argument {Object} data - The data object generated by update method
  	 * @argument {Object} options - Modifiers configuration and options
  	 * @argument {Number|String} options.offset=0
  	 * The offset value as described in the modifier description
  	 * @returns {Object} The data object, properly modified
  	 */
  	function offset(data, _ref) {
  		var offset = _ref.offset;
  		var placement = data.placement,
  			_data$offsets = data.offsets,
  			popper = _data$offsets.popper,
  			reference = _data$offsets.reference;
  
  		var basePlacement = placement.split('-')[0];
  
  		var offsets = void 0;
  		if (isNumeric(+offset)) {
  			offsets = [+offset, 0];
  		} else {
  			offsets = parseOffset(offset, popper, reference, basePlacement);
  		}
  
  		if (basePlacement === 'left') {
  			popper.top += offsets[0];
  			popper.left -= offsets[1];
  		} else if (basePlacement === 'right') {
  			popper.top += offsets[0];
  			popper.left += offsets[1];
  		} else if (basePlacement === 'top') {
  			popper.left += offsets[0];
  			popper.top -= offsets[1];
  		} else if (basePlacement === 'bottom') {
  			popper.left += offsets[0];
  			popper.top += offsets[1];
  		}
  
  		data.popper = popper;
  		return data;
  	}
  
  	/**
  	 * @function
  	 * @memberof Modifiers
  	 * @argument {Object} data - The data object generated by `update` method
  	 * @argument {Object} options - Modifiers configuration and options
  	 * @returns {Object} The data object, properly modified
  	 */
  	function preventOverflow(data, options) {
  		var boundariesElement = options.boundariesElement || getOffsetParent(data.instance.popper);
  
  		// If offsetParent is the reference element, we really want to
  		// go one step up and use the next offsetParent as reference to
  		// avoid to make this modifier completely useless and look like broken
  		if (data.instance.reference === boundariesElement) {
  			boundariesElement = getOffsetParent(boundariesElement);
  		}
  
  		// NOTE: DOM access here
  		// resets the popper's position so that the document size can be calculated excluding
  		// the size of the popper element itself
  		var transformProp = getSupportedPropertyName('transform');
  		var popperStyles = data.instance.popper.style; // assignment to help minification
  		var top = popperStyles.top,
  			left = popperStyles.left,
  			transform = popperStyles[transformProp];
  
  		popperStyles.top = '';
  		popperStyles.left = '';
  		popperStyles[transformProp] = '';
  
  		var boundaries = getBoundaries(data.instance.popper, data.instance.reference, options.padding, boundariesElement, data.positionFixed);
  
  		// NOTE: DOM access here
  		// restores the original style properties after the offsets have been computed
  		popperStyles.top = top;
  		popperStyles.left = left;
  		popperStyles[transformProp] = transform;
  
  		options.boundaries = boundaries;
  
  		var order = options.priority;
  		var popper = data.offsets.popper;
  
  		var check = {
  			primary: function primary(placement) {
  				var value = popper[placement];
  				if (popper[placement] < boundaries[placement] && !options.escapeWithReference) {
  					value = Math.max(popper[placement], boundaries[placement]);
  				}
  				return defineProperty({}, placement, value);
  			},
  			secondary: function secondary(placement) {
  				var mainSide = placement === 'right' ? 'left' : 'top';
  				var value = popper[mainSide];
  				if (popper[placement] > boundaries[placement] && !options.escapeWithReference) {
  					value = Math.min(popper[mainSide], boundaries[placement] - (placement === 'right' ? popper.width : popper.height));
  				}
  				return defineProperty({}, mainSide, value);
  			}
  		};
  
  		order.forEach(function (placement) {
  			var side = ['left', 'top'].indexOf(placement) !== -1 ? 'primary' : 'secondary';
  			popper = _extends({}, popper, check[side](placement));
  		});
  
  		data.offsets.popper = popper;
  
  		return data;
  	}
  
  	/**
  	 * @function
  	 * @memberof Modifiers
  	 * @argument {Object} data - The data object generated by `update` method
  	 * @argument {Object} options - Modifiers configuration and options
  	 * @returns {Object} The data object, properly modified
  	 */
  	function shift(data) {
  		var placement = data.placement;
  		var basePlacement = placement.split('-')[0];
  		var shiftvariation = placement.split('-')[1];
  
  		// if shift shiftvariation is specified, run the modifier
  		if (shiftvariation) {
  			var _data$offsets = data.offsets,
  				reference = _data$offsets.reference,
  				popper = _data$offsets.popper;
  
  			var isVertical = ['bottom', 'top'].indexOf(basePlacement) !== -1;
  			var side = isVertical ? 'left' : 'top';
  			var measurement = isVertical ? 'width' : 'height';
  
  			var shiftOffsets = {
  				start: defineProperty({}, side, reference[side]),
  				end: defineProperty({}, side, reference[side] + reference[measurement] - popper[measurement])
  			};
  
  			data.offsets.popper = _extends({}, popper, shiftOffsets[shiftvariation]);
  		}
  
  		return data;
  	}
  
  	/**
  	 * @function
  	 * @memberof Modifiers
  	 * @argument {Object} data - The data object generated by update method
  	 * @argument {Object} options - Modifiers configuration and options
  	 * @returns {Object} The data object, properly modified
  	 */
  	function hide(data) {
  		if (!isModifierRequired(data.instance.modifiers, 'hide', 'preventOverflow')) {
  			return data;
  		}
  
  		var refRect = data.offsets.reference;
  		var bound = find(data.instance.modifiers, function (modifier) {
  			return modifier.name === 'preventOverflow';
  		}).boundaries;
  
  		if (refRect.bottom < bound.top || refRect.left > bound.right || refRect.top > bound.bottom || refRect.right < bound.left) {
  			// Avoid unnecessary DOM access if visibility hasn't changed
  			if (data.hide === true) {
  				return data;
  			}
  
  			data.hide = true;
  			data.attributes['x-out-of-boundaries'] = '';
  		} else {
  			// Avoid unnecessary DOM access if visibility hasn't changed
  			if (data.hide === false) {
  				return data;
  			}
  
  			data.hide = false;
  			data.attributes['x-out-of-boundaries'] = false;
  		}
  
  		return data;
  	}
  
  	/**
  	 * @function
  	 * @memberof Modifiers
  	 * @argument {Object} data - The data object generated by `update` method
  	 * @argument {Object} options - Modifiers configuration and options
  	 * @returns {Object} The data object, properly modified
  	 */
  	function inner(data) {
  		var placement = data.placement;
  		var basePlacement = placement.split('-')[0];
  		var _data$offsets = data.offsets,
  			popper = _data$offsets.popper,
  			reference = _data$offsets.reference;
  
  		var isHoriz = ['left', 'right'].indexOf(basePlacement) !== -1;
  
  		var subtractLength = ['top', 'left'].indexOf(basePlacement) === -1;
  
  		popper[isHoriz ? 'left' : 'top'] = reference[basePlacement] - (subtractLength ? popper[isHoriz ? 'width' : 'height'] : 0);
  
  		data.placement = getOppositePlacement(placement);
  		data.offsets.popper = getClientRect(popper);
  
  		return data;
  	}
  
  	/**
  	 * Modifier function, each modifier can have a function of this type assigned
  	 * to its `fn` property.<br />
  	 * These functions will be called on each update, this means that you must
  	 * make sure they are performant enough to avoid performance bottlenecks.
  	 *
  	 * @function ModifierFn
  	 * @argument {dataObject} data - The data object generated by `update` method
  	 * @argument {Object} options - Modifiers configuration and options
  	 * @returns {dataObject} The data object, properly modified
  	 */
  
  	/**
  	 * Modifiers are plugins used to alter the behavior of your poppers.<br />
  	 * Popper.js uses a set of 9 modifiers to provide all the basic functionalities
  	 * needed by the library.
  	 *
  	 * Usually you don't want to override the `order`, `fn` and `onLoad` props.
  	 * All the other properties are configurations that could be tweaked.
  	 * @namespace modifiers
  	 */
  	var modifiers = {
  		/**
  		 * Modifier used to shift the popper on the start or end of its reference
  		 * element.<br />
  		 * It will read the variation of the `placement` property.<br />
  		 * It can be one either `-end` or `-start`.
  		 * @memberof modifiers
  		 * @inner
  		 */
  		shift: {
  			/** @prop {number} order=100 - Index used to define the order of execution */
  			order: 100,
  			/** @prop {Boolean} enabled=true - Whether the modifier is enabled or not */
  			enabled: true,
  			/** @prop {ModifierFn} */
  			fn: shift
  		},
  
  		/**
  		 * The `offset` modifier can shift your popper on both its axis.
  		 *
  		 * It accepts the following units:
  		 * - `px` or unit-less, interpreted as pixels
  		 * - `%` or `%r`, percentage relative to the length of the reference element
  		 * - `%p`, percentage relative to the length of the popper element
  		 * - `vw`, CSS viewport width unit
  		 * - `vh`, CSS viewport height unit
  		 *
  		 * For length is intended the main axis relative to the placement of the popper.<br />
  		 * This means that if the placement is `top` or `bottom`, the length will be the
  		 * `width`. In case of `left` or `right`, it will be the `height`.
  		 *
  		 * You can provide a single value (as `Number` or `String`), or a pair of values
  		 * as `String` divided by a comma or one (or more) white spaces.<br />
  		 * The latter is a deprecated method because it leads to confusion and will be
  		 * removed in v2.<br />
  		 * Additionally, it accepts additions and subtractions between different units.
  		 * Note that multiplications and divisions aren't supported.
  		 *
  		 * Valid examples are:
  		 * ```
  		 * 10
  		 * '10%'
  		 * '10, 10'
  		 * '10%, 10'
  		 * '10 + 10%'
  		 * '10 - 5vh + 3%'
  		 * '-10px + 5vh, 5px - 6%'
  		 * ```
  		 * > **NB**: If you desire to apply offsets to your poppers in a way that may make them overlap
  		 * > with their reference element, unfortunately, you will have to disable the `flip` modifier.
  		 * > You can read more on this at this [issue](https://github.com/FezVrasta/popper.js/issues/373).
  		 *
  		 * @memberof modifiers
  		 * @inner
  		 */
  		offset: {
  			/** @prop {number} order=200 - Index used to define the order of execution */
  			order: 200,
  			/** @prop {Boolean} enabled=true - Whether the modifier is enabled or not */
  			enabled: true,
  			/** @prop {ModifierFn} */
  			fn: offset,
  			/** @prop {Number|String} offset=0
  			 * The offset value as described in the modifier description
  			 */
  			offset: 0
  		},
  
  		/**
  		 * Modifier used to prevent the popper from being positioned outside the boundary.
  		 *
  		 * A scenario exists where the reference itself is not within the boundaries.<br />
  		 * We can say it has "escaped the boundaries" — or just "escaped".<br />
  		 * In this case we need to decide whether the popper should either:
  		 *
  		 * - detach from the reference and remain "trapped" in the boundaries, or
  		 * - if it should ignore the boundary and "escape with its reference"
  		 *
  		 * When `escapeWithReference` is set to`true` and reference is completely
  		 * outside its boundaries, the popper will overflow (or completely leave)
  		 * the boundaries in order to remain attached to the edge of the reference.
  		 *
  		 * @memberof modifiers
  		 * @inner
  		 */
  		preventOverflow: {
  			/** @prop {number} order=300 - Index used to define the order of execution */
  			order: 300,
  			/** @prop {Boolean} enabled=true - Whether the modifier is enabled or not */
  			enabled: true,
  			/** @prop {ModifierFn} */
  			fn: preventOverflow,
  			/**
  			 * @prop {Array} [priority=['left','right','top','bottom']]
  			 * Popper will try to prevent overflow following these priorities by default,
  			 * then, it could overflow on the left and on top of the `boundariesElement`
  			 */
  			priority: ['left', 'right', 'top', 'bottom'],
  			/**
  			 * @prop {number} padding=5
  			 * Amount of pixel used to define a minimum distance between the boundaries
  			 * and the popper. This makes sure the popper always has a little padding
  			 * between the edges of its container
  			 */
  			padding: 5,
  			/**
  			 * @prop {String|HTMLElement} boundariesElement='scrollParent'
  			 * Boundaries used by the modifier. Can be `scrollParent`, `window`,
  			 * `viewport` or any DOM element.
  			 */
  			boundariesElement: 'scrollParent'
  		},
  
  		/**
  		 * Modifier used to make sure the reference and its popper stay near each other
  		 * without leaving any gap between the two. Especially useful when the arrow is
  		 * enabled and you want to ensure that it points to its reference element.
  		 * It cares only about the first axis. You can still have poppers with margin
  		 * between the popper and its reference element.
  		 * @memberof modifiers
  		 * @inner
  		 */
  		keepTogether: {
  			/** @prop {number} order=400 - Index used to define the order of execution */
  			order: 400,
  			/** @prop {Boolean} enabled=true - Whether the modifier is enabled or not */
  			enabled: true,
  			/** @prop {ModifierFn} */
  			fn: keepTogether
  		},
  
  		/**
  		 * This modifier is used to move the `arrowElement` of the popper to make
  		 * sure it is positioned between the reference element and its popper element.
  		 * It will read the outer size of the `arrowElement` node to detect how many
  		 * pixels of conjunction are needed.
  		 *
  		 * It has no effect if no `arrowElement` is provided.
  		 * @memberof modifiers
  		 * @inner
  		 */
  		arrow: {
  			/** @prop {number} order=500 - Index used to define the order of execution */
  			order: 500,
  			/** @prop {Boolean} enabled=true - Whether the modifier is enabled or not */
  			enabled: true,
  			/** @prop {ModifierFn} */
  			fn: arrow,
  			/** @prop {String|HTMLElement} element='[x-arrow]' - Selector or node used as arrow */
  			element: '[x-arrow]'
  		},
  
  		/**
  		 * Modifier used to flip the popper's placement when it starts to overlap its
  		 * reference element.
  		 *
  		 * Requires the `preventOverflow` modifier before it in order to work.
  		 *
  		 * **NOTE:** this modifier will interrupt the current update cycle and will
  		 * restart it if it detects the need to flip the placement.
  		 * @memberof modifiers
  		 * @inner
  		 */
  		flip: {
  			/** @prop {number} order=600 - Index used to define the order of execution */
  			order: 600,
  			/** @prop {Boolean} enabled=true - Whether the modifier is enabled or not */
  			enabled: true,
  			/** @prop {ModifierFn} */
  			fn: flip,
  			/**
  			 * @prop {String|Array} behavior='flip'
  			 * The behavior used to change the popper's placement. It can be one of
  			 * `flip`, `clockwise`, `counterclockwise` or an array with a list of valid
  			 * placements (with optional variations)
  			 */
  			behavior: 'flip',
  			/**
  			 * @prop {number} padding=5
  			 * The popper will flip if it hits the edges of the `boundariesElement`
  			 */
  			padding: 5,
  			/**
  			 * @prop {String|HTMLElement} boundariesElement='viewport'
  			 * The element which will define the boundaries of the popper position.
  			 * The popper will never be placed outside of the defined boundaries
  			 * (except if `keepTogether` is enabled)
  			 */
  			boundariesElement: 'viewport'
  		},
  
  		/**
  		 * Modifier used to make the popper flow toward the inner of the reference element.
  		 * By default, when this modifier is disabled, the popper will be placed outside
  		 * the reference element.
  		 * @memberof modifiers
  		 * @inner
  		 */
  		inner: {
  			/** @prop {number} order=700 - Index used to define the order of execution */
  			order: 700,
  			/** @prop {Boolean} enabled=false - Whether the modifier is enabled or not */
  			enabled: false,
  			/** @prop {ModifierFn} */
  			fn: inner
  		},
  
  		/**
  		 * Modifier used to hide the popper when its reference element is outside of the
  		 * popper boundaries. It will set a `x-out-of-boundaries` attribute which can
  		 * be used to hide with a CSS selector the popper when its reference is
  		 * out of boundaries.
  		 *
  		 * Requires the `preventOverflow` modifier before it in order to work.
  		 * @memberof modifiers
  		 * @inner
  		 */
  		hide: {
  			/** @prop {number} order=800 - Index used to define the order of execution */
  			order: 800,
  			/** @prop {Boolean} enabled=true - Whether the modifier is enabled or not */
  			enabled: true,
  			/** @prop {ModifierFn} */
  			fn: hide
  		},
  
  		/**
  		 * Computes the style that will be applied to the popper element to gets
  		 * properly positioned.
  		 *
  		 * Note that this modifier will not touch the DOM, it just prepares the styles
  		 * so that `applyStyle` modifier can apply it. This separation is useful
  		 * in case you need to replace `applyStyle` with a custom implementation.
  		 *
  		 * This modifier has `850` as `order` value to maintain backward compatibility
  		 * with previous versions of Popper.js. Expect the modifiers ordering method
  		 * to change in future major versions of the library.
  		 *
  		 * @memberof modifiers
  		 * @inner
  		 */
  		computeStyle: {
  			/** @prop {number} order=850 - Index used to define the order of execution */
  			order: 850,
  			/** @prop {Boolean} enabled=true - Whether the modifier is enabled or not */
  			enabled: true,
  			/** @prop {ModifierFn} */
  			fn: computeStyle,
  			/**
  			 * @prop {Boolean} gpuAcceleration=true
  			 * If true, it uses the CSS 3D transformation to position the popper.
  			 * Otherwise, it will use the `top` and `left` properties
  			 */
  			gpuAcceleration: true,
  			/**
  			 * @prop {string} [x='bottom']
  			 * Where to anchor the X axis (`bottom` or `top`). AKA X offset origin.
  			 * Change this if your popper should grow in a direction different from `bottom`
  			 */
  			x: 'bottom',
  			/**
  			 * @prop {string} [x='left']
  			 * Where to anchor the Y axis (`left` or `right`). AKA Y offset origin.
  			 * Change this if your popper should grow in a direction different from `right`
  			 */
  			y: 'right'
  		},
  
  		/**
  		 * Applies the computed styles to the popper element.
  		 *
  		 * All the DOM manipulations are limited to this modifier. This is useful in case
  		 * you want to integrate Popper.js inside a framework or view library and you
  		 * want to delegate all the DOM manipulations to it.
  		 *
  		 * Note that if you disable this modifier, you must make sure the popper element
  		 * has its position set to `absolute` before Popper.js can do its work!
  		 *
  		 * Just disable this modifier and define your own to achieve the desired effect.
  		 *
  		 * @memberof modifiers
  		 * @inner
  		 */
  		applyStyle: {
  			/** @prop {number} order=900 - Index used to define the order of execution */
  			order: 900,
  			/** @prop {Boolean} enabled=true - Whether the modifier is enabled or not */
  			enabled: true,
  			/** @prop {ModifierFn} */
  			fn: applyStyle,
  			/** @prop {Function} */
  			onLoad: applyStyleOnLoad,
  			/**
  			 * @deprecated since version 1.10.0, the property moved to `computeStyle` modifier
  			 * @prop {Boolean} gpuAcceleration=true
  			 * If true, it uses the CSS 3D transformation to position the popper.
  			 * Otherwise, it will use the `top` and `left` properties
  			 */
  			gpuAcceleration: undefined
  		}
  	};
  
  	/**
  	 * The `dataObject` is an object containing all the information used by Popper.js.
  	 * This object is passed to modifiers and to the `onCreate` and `onUpdate` callbacks.
  	 * @name dataObject
  	 * @property {Object} data.instance The Popper.js instance
  	 * @property {String} data.placement Placement applied to popper
  	 * @property {String} data.originalPlacement Placement originally defined on init
  	 * @property {Boolean} data.flipped True if popper has been flipped by flip modifier
  	 * @property {Boolean} data.hide True if the reference element is out of boundaries, useful to know when to hide the popper
  	 * @property {HTMLElement} data.arrowElement Node used as arrow by arrow modifier
  	 * @property {Object} data.styles Any CSS property defined here will be applied to the popper. It expects the JavaScript nomenclature (eg. `marginBottom`)
  	 * @property {Object} data.arrowStyles Any CSS property defined here will be applied to the popper arrow. It expects the JavaScript nomenclature (eg. `marginBottom`)
  	 * @property {Object} data.boundaries Offsets of the popper boundaries
  	 * @property {Object} data.offsets The measurements of popper, reference and arrow elements
  	 * @property {Object} data.offsets.popper `top`, `left`, `width`, `height` values
  	 * @property {Object} data.offsets.reference `top`, `left`, `width`, `height` values
  	 * @property {Object} data.offsets.arrow] `top` and `left` offsets, only one of them will be different from 0
  	 */
  
  	/**
  	 * Default options provided to Popper.js constructor.<br />
  	 * These can be overridden using the `options` argument of Popper.js.<br />
  	 * To override an option, simply pass an object with the same
  	 * structure of the `options` object, as the 3rd argument. For example:
  	 * ```
  	 * new Popper(ref, pop, {
  	 *   modifiers: {
  	 *     preventOverflow: { enabled: false }
  	 *   }
  	 * })
  	 * ```
  	 * @type {Object}
  	 * @static
  	 * @memberof Popper
  	 */
  	var Defaults = {
  		/**
  		 * Popper's placement.
  		 * @prop {Popper.placements} placement='bottom'
  		 */
  		placement: 'bottom',
  
  		/**
  		 * Set this to true if you want popper to position it self in 'fixed' mode
  		 * @prop {Boolean} positionFixed=false
  		 */
  		positionFixed: false,
  
  		/**
  		 * Whether events (resize, scroll) are initially enabled.
  		 * @prop {Boolean} eventsEnabled=true
  		 */
  		eventsEnabled: true,
  
  		/**
  		 * Set to true if you want to automatically remove the popper when
  		 * you call the `destroy` method.
  		 * @prop {Boolean} removeOnDestroy=false
  		 */
  		removeOnDestroy: false,
  
  		/**
  		 * Callback called when the popper is created.<br />
  		 * By default, it is set to no-op.<br />
  		 * Access Popper.js instance with `data.instance`.
  		 * @prop {onCreate}
  		 */
  		onCreate: function onCreate() {},
  
  		/**
  		 * Callback called when the popper is updated. This callback is not called
  		 * on the initialization/creation of the popper, but only on subsequent
  		 * updates.<br />
  		 * By default, it is set to no-op.<br />
  		 * Access Popper.js instance with `data.instance`.
  		 * @prop {onUpdate}
  		 */
  		onUpdate: function onUpdate() {},
  
  		/**
  		 * List of modifiers used to modify the offsets before they are applied to the popper.
  		 * They provide most of the functionalities of Popper.js.
  		 * @prop {modifiers}
  		 */
  		modifiers: modifiers
  	};
  
  	/**
  	 * @callback onCreate
  	 * @param {dataObject} data
  	 */
  
  	/**
  	 * @callback onUpdate
  	 * @param {dataObject} data
  	 */
  
  // Utils
  // Methods
  	var Popper = function () {
  		/**
  		 * Creates a new Popper.js instance.
  		 * @class Popper
  		 * @param {HTMLElement|referenceObject} reference - The reference element used to position the popper
  		 * @param {HTMLElement} popper - The HTML element used as the popper
  		 * @param {Object} options - Your custom options to override the ones defined in [Defaults](#defaults)
  		 * @return {Object} instance - The generated Popper.js instance
  		 */
  		function Popper(reference, popper) {
  			var _this = this;
  
  			var options = arguments.length > 2 && arguments[2] !== undefined ? arguments[2] : {};
  			classCallCheck(this, Popper);
  
  			this.scheduleUpdate = function () {
  				return requestAnimationFrame(_this.update);
  			};
  
  			// make update() debounced, so that it only runs at most once-per-tick
  			this.update = debounce(this.update.bind(this));
  
  			// with {} we create a new object with the options inside it
  			this.options = _extends({}, Popper.Defaults, options);
  
  			// init state
  			this.state = {
  				isDestroyed: false,
  				isCreated: false,
  				scrollParents: []
  			};
  
  			// get reference and popper elements (allow jQuery wrappers)
  			this.reference = reference && reference.jquery ? reference[0] : reference;
  			this.popper = popper && popper.jquery ? popper[0] : popper;
  
  			// Deep merge modifiers options
  			this.options.modifiers = {};
  			Object.keys(_extends({}, Popper.Defaults.modifiers, options.modifiers)).forEach(function (name) {
  				_this.options.modifiers[name] = _extends({}, Popper.Defaults.modifiers[name] || {}, options.modifiers ? options.modifiers[name] : {});
  			});
  
  			// Refactoring modifiers' list (Object => Array)
  			this.modifiers = Object.keys(this.options.modifiers).map(function (name) {
  				return _extends({
  					name: name
  				}, _this.options.modifiers[name]);
  			})
  			// sort the modifiers by order
  				.sort(function (a, b) {
  					return a.order - b.order;
  				});
  
  			// modifiers have the ability to execute arbitrary code when Popper.js get inited
  			// such code is executed in the same order of its modifier
  			// they could add new properties to their options configuration
  			// BE AWARE: don't add options to `options.modifiers.name` but to `modifierOptions`!
  			this.modifiers.forEach(function (modifierOptions) {
  				if (modifierOptions.enabled && isFunction(modifierOptions.onLoad)) {
  					modifierOptions.onLoad(_this.reference, _this.popper, _this.options, modifierOptions, _this.state);
  				}
  			});
  
  			// fire the first update to position the popper in the right place
  			this.update();
  
  			var eventsEnabled = this.options.eventsEnabled;
  			if (eventsEnabled) {
  				// setup event listeners, they will take care of update the position in specific situations
  				this.enableEventListeners();
  			}
  
  			this.state.eventsEnabled = eventsEnabled;
  		}
  
  		// We can't use class properties because they don't get listed in the
  		// class prototype and break stuff like Sinon stubs
  
  
  		createClass(Popper, [{
  			key: 'update',
  			value: function update$$1() {
  				return update.call(this);
  			}
  		}, {
  			key: 'destroy',
  			value: function destroy$$1() {
  				return destroy.call(this);
  			}
  		}, {
  			key: 'enableEventListeners',
  			value: function enableEventListeners$$1() {
  				return enableEventListeners.call(this);
  			}
  		}, {
  			key: 'disableEventListeners',
  			value: function disableEventListeners$$1() {
  				return disableEventListeners.call(this);
  			}
  
  			/**
  			 * Schedules an update. It will run on the next UI update available.
  			 * @method scheduleUpdate
  			 * @memberof Popper
  			 */
  
  
  			/**
  			 * Collection of utilities useful when writing custom modifiers.
  			 * Starting from version 1.7, this method is available only if you
  			 * include `popper-utils.js` before `popper.js`.
  			 *
  			 * **DEPRECATION**: This way to access PopperUtils is deprecated
  			 * and will be removed in v2! Use the PopperUtils module directly instead.
  			 * Due to the high instability of the methods contained in Utils, we can't
  			 * guarantee them to follow semver. Use them at your own risk!
  			 * @static
  			 * @private
  			 * @type {Object}
  			 * @deprecated since version 1.8
  			 * @member Utils
  			 * @memberof Popper
  			 */
  
  		}]);
  		return Popper;
  	}();
  
  	/**
  	 * The `referenceObject` is an object that provides an interface compatible with Popper.js
  	 * and lets you use it as replacement of a real DOM node.<br />
  	 * You can use this method to position a popper relatively to a set of coordinates
  	 * in case you don't have a DOM node to use as reference.
  	 *
  	 * ```
  	 * new Popper(referenceObject, popperNode);
  	 * ```
  	 *
  	 * NB: This feature isn't supported in Internet Explorer 10.
  	 * @name referenceObject
  	 * @property {Function} data.getBoundingClientRect
  	 * A function that returns a set of coordinates compatible with the native `getBoundingClientRect` method.
  	 * @property {number} data.clientWidth
  	 * An ES6 getter that will return the width of the virtual reference element.
  	 * @property {number} data.clientHeight
  	 * An ES6 getter that will return the height of the virtual reference element.
  	 */
  
  
  	Popper.Utils = (typeof window !== 'undefined' ? window : global).PopperUtils;
  	Popper.placements = placements;
  	Popper.Defaults = Defaults;
  
  	return Popper;
  
  })));
  //# sourceMappingURL=popper.js.map
  