resource-selection-candidate-insert-before.html

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This test has a WPT meta file that expects 1 subtest issues.
This WPT test may be referenced by the following Test IDs:
- /html/semantics/embedded-content/media-elements/loading-the-media-resource/resource-selection-candidate-insert-before.html - WPT Dashboard Interop Dashboard

<!doctype html>

<title>inserting another source before the candidate</title>

<script src="/resources/testharness.js"></script>

<script src="/resources/testharnessreport.js"></script>

<div id=log></div>

<script>

var v;

function createSource(src) {

  var source = document.createElement('source');

  source.src = src;

  return source;

var t = async_test(function(t) {

  v = document.createElement('video');

  v.addEventListener('loadstart', t.step_func(function() {

    assert_equals(v.currentSrc.substr(v.currentSrc.lastIndexOf('#')), '#a');

    t.done();

  }), false);

  v.appendChild(createSource('#a')); // invokes resource selection

});

</script>

<!-- now resource selection algorithm will continue its sync section (the </script> tag below provides a stable state) -->

<!-- #a is candidate -->

<!-- pointer is between #a and the end of the list -->

<script>

t.step(function() {

  v.insertBefore(createSource('#b'), v.firstChild); // pointer is unchanged, #a is still candidate

});

</script>