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<!doctype html>
<meta charset=utf-8>
<title>Node.appendChild: inserting script and source from a fragment</title>
<script src=/resources/testharness.js></script>
<script src=/resources/testharnessreport.js></script>
<video id="media"></video>
<script>
const happened = [];
const media = document.getElementById("media");
test(() => {
const source = document.createElement("source");
const script = document.createElement("script");
script.textContent = `
happened.push(media.networkState);
`;
const df = document.createDocumentFragment();
df.appendChild(script);
df.appendChild(source);
assert_array_equals(happened, []);
media.appendChild(df);
// This is because immediately during DOM insertion, before the
// post-insertion steps invoke script, `<source>` insertion invokes the
// resource selection algorithm [1] which does this assignment. This
// assignment takes place before earlier-inserted script elements run
// post-insertion.
//
// [1]: https://html.spec.whatwg.org/#concept-media-load-algorithm
assert_array_equals(happened, [HTMLMediaElement.NETWORK_NO_SOURCE]);
}, "Empty <source> immediately sets media.networkState during DOM insertion, " +
"so that an earlier-running script can observe networkState");
</script>
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