File: resource-selection-candidate-insert-before.html

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<!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>