text: /** Call a function after loading some font files*/
  function waitForWebfonts(fonts, callback) {
      var loadedFonts = 0;
      for(var i = 0, l = fonts.length; i < l; ++i) {
          (function(font) {
              var node = document.createElement('span');
              // Characters that vary significantly among different fonts
              node.innerHTML = 'giItT1WQy@!-/#';
              // Visible - so we can measure it - but not on the screen
              node.style.position      = 'absolute';
              node.style.left          = '-10000px';
              node.style.top           = '-10000px';
              // Large font size makes even subtle changes obvious
              node.style.fontSize      = '300px';
              // Reset any font properties
              node.style.fontFamily    = 'sans-serif';
              node.style.fontVariant   = 'normal';
              node.style.fontStyle     = 'normal';
              node.style.fontWeight    = 'normal';
              node.style.letterSpacing = '0';
              document.body.appendChild(node);
  
              // Remember width with no applied web font
              var width = node.offsetWidth;
  
              node.style.fontFamily = font;
  
              var interval;
              function checkFont() {
                  // Compare current width with original width
                  if(node && node.offsetWidth != width) {
                      ++loadedFonts;
                      node.parentNode.removeChild(node);
                      node = null;
                  }
  
                  // If all fonts have been loaded
                  if(loadedFonts >= fonts.length) {
                      if(interval) {
                          clearInterval(interval);
                      }
                      if(loadedFonts == fonts.length) {
                          callback();
                          return true;
                      }
                  }
              };
  
              if(!checkFont()) {
                  interval = setInterval(checkFont, 50);
              }
          })(fonts[i]);
      }
  };
  
  export {waitForWebfonts};