File: fontface-fonts-loading.html

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<!DOCTYPE html>
<title>Test document.fonts.ready loading with two fonts</title>
<link rel="help" href="https://drafts.csswg.org/css-font-loading/#fontfaceset-ready">
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
<style>
@font-face {
  font-family: "AhemTest";
  src: url("/fonts/Ahem.ttf") format("truetype");
}
.initial {
  font-family: "AhemTest", sans-serif;
  font-size: 20px;
}
</style>
<div>Font loading test</div>
<script>
promise_test(async t => {
  const fontSet = document.fonts;
  const readyPromise1 = fontSet.ready;
  await readyPromise1;
  assert_equals(fontSet.status, "loaded", "ready promise should resolve when fonts loaded");

  const dynamicFace = new FontFace("AhemTest2", "url(/fonts/Ahem.ttf)");
  fontSet.add(dynamicFace);
  dynamicFace.load();
  const readyPromise2 = fontSet.ready;
  assert_not_equals(readyPromise1, readyPromise2, "A new FontFace added should create a new document.fonts.ready promise");

  await readyPromise2;
  assert_equals(fontSet.status, "loaded", "document.fonts.status should be 'loaded'");
}, "document.fonts.ready is replaced as new fonts are loaded");
</script>