Cancel current network requests See https://github.com/sampotts/plyr/issues/174
function cancelRequests() {
	    if (!this.isHTML5) {
	      return;
	    } // Remove child sources


	    removeElement(html5.getSources.call(this)); // Set blank video src attribute
	    // This is to prevent a MEDIA_ERR_SRC_NOT_SUPPORTED error
	    // Info: http://stackoverflow.com/questions/32231579/how-to-properly-dispose-of-an-html5-video-and-close-socket-or-connection

	    this.media.setAttribute('src', this.config.blankVideo); // Load the new empty source
	    // This will cancel existing requests
	    // See https://github.com/sampotts/plyr/issues/174

	    this.media.load(); // Debugging

	    this.debug.log('Cancelled network requests');
	  }