File: resource-selection-source-media-env-change.html

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<!doctype html>
<title>the &lt;source> media attribute: no reaction to environment change</title>
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
<div id=log></div>
<iframe src="resources/media-min-width.html" width="300"></iframe>
<script>
// promises for the iframed test to resolve
let beforeEnvChange = new Promise((resolve, reject) => {
  window[0].resolveBeforeEnvChange = resolve;
});
let afterEnvChange = new Promise((resolve, reject) => {
  window[0].resolveAfterEnvChange = resolve;
});
let afterLoadCalled = new Promise((resolve, reject) => {
  window[0].resolveAfterLoadCalled = resolve;
});
const t = promise_test(async () => {
  [beforeEnvChange, afterEnvChange, afterLoadCalled] = await Promise.all([ beforeEnvChange, afterEnvChange, afterLoadCalled ]);
  assert_equals(beforeEnvChange, '#a', 'beforeEnvChange');
  assert_equals(afterEnvChange, '#a', 'afterEnvChange');
  assert_equals(afterLoadCalled, '#b', 'afterLoadCalled');
});
</script>