demo/dist/demo.js
function getQualityOptions() {
	    // Get sizes from <source> elements
	    return html5.getSources.call(this).map(function (source) {
	      return Number(source.getAttribute('size'));
	    }).filter(Boolean);
	  }
function getQualityOptions() {
	    // Get sizes from <source> elements
	    return html5.getSources.call(this).map(function (source) {
	      return Number(source.getAttribute('size'));
	    }).filter(Boolean);
	  }
Get quality levels