CodePen

HTML

            
              

            
          
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↑ Insert the most common viewport meta tag

CSS

            
              
            
          
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JS

            
               play: function() {
  var that = this;
  setTimeout(function(){
   that._audio.play();
  }, 0);
 },
 
 initWithContentsOfURL_error: function(url1, arg2) {
  // parameter url1 is of type HTMLAnchorElement
  this._audio = new Audio(url1.href);
  return this;
 },
            
          
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Must be a valid URL.
+ add another resource
via JS Hint
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