dom/media/webvtt/test/mochitest/manifest.js

   1 // Force releasing decoder to avoid timeout in waiting for decoding resource.
   2 function removeNodeAndSource(n) {
   3   n.remove();
   4   // reset |srcObject| first since it takes precedence over |src|.
   5   n.srcObject = null;
   6   n.removeAttribute("src");
   7   n.load();
   8   while (n.firstChild) {
   9     n.firstChild.remove();
  10   }
  11 }
  12
  13 function once(target, name, cb) {
  14   var p = new Promise(function (resolve) {
  15     target.addEventListener(
  16       name,
  17       function () {
  18         resolve();
  19       },
  20       { once: true }
  21     );
  22   });
  23   if (cb) {
  24     p.then(cb);
  25   }
  26   return p;
  27 }