text: function toggleDarkMode() { // jshint ignore:line
  	var toggler = document.getElementById( 'dark-mode-toggler' );
  
  	if ( 'false' === toggler.getAttribute( 'aria-pressed' ) ) {
  		toggler.setAttribute( 'aria-pressed', 'true' );
  		document.documentElement.classList.add( 'is-dark-theme' );
  		document.body.classList.add( 'is-dark-theme' );
  		window.localStorage.setItem( 'twentytwentyoneDarkMode', 'yes' );
  	} else {
  		toggler.setAttribute( 'aria-pressed', 'false' );
  		document.documentElement.classList.remove( 'is-dark-theme' );
  		document.body.classList.remove( 'is-dark-theme' );
  		window.localStorage.setItem( 'twentytwentyoneDarkMode', 'no' );
  	}
  }
  
  function twentytwentyoneIsDarkMode() {
  	var isDarkMode = window.matchMedia( '(prefers-color-scheme: dark)' ).matches;
  
  	if ( 'yes' === window.localStorage.getItem( 'twentytwentyoneDarkMode' ) ) {
  		isDarkMode = true;
  	} else if ( 'no' === window.localStorage.getItem( 'twentytwentyoneDarkMode' ) ) {
  		isDarkMode = false;
  	}
  
  	return isDarkMode;
  }
  
  function darkModeInitialLoad() {
  	var toggler = document.getElementById( 'dark-mode-toggler' ),
  		isDarkMode = twentytwentyoneIsDarkMode();
  
  	if ( isDarkMode ) {
  		document.documentElement.classList.add( 'is-dark-theme' );
  		document.body.classList.add( 'is-dark-theme' );
  	} else {
  		document.documentElement.classList.remove( 'is-dark-theme' );
  		document.body.classList.remove( 'is-dark-theme' );
  	}
  
  	if ( toggler && isDarkMode ) {
  		toggler.setAttribute( 'aria-pressed', 'true' );
  	}
  }
  
  function darkModeRepositionTogglerOnScroll() {
  
  	var toggler = document.getElementById( 'dark-mode-toggler' ),
  		prevScroll = window.scrollY || document.documentElement.scrollTop,
  		currentScroll,
  
  		checkScroll = function() {
  			currentScroll = window.scrollY || document.documentElement.scrollTop;
  			if (
  				currentScroll + ( window.innerHeight * 1.5 ) > document.body.clientHeight ||
  				currentScroll < prevScroll
  			) {
  				toggler.classList.remove( 'hide' );
  			} else if ( currentScroll > prevScroll && 250 < currentScroll ) {
  				toggler.classList.add( 'hide' );
  			}
  			prevScroll = currentScroll;
  		};
  
  	if ( toggler ) {
  		window.addEventListener( 'scroll', checkScroll );
  	}
  }
  
  darkModeInitialLoad();
  darkModeRepositionTogglerOnScroll();
  