test_bug1375944.html

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<!DOCTYPE html>

<html>

<head>

  <title>Test for bug 1375944</title>

  <script src="/tests/SimpleTest/SimpleTest.js"></script>

  <link rel="stylesheet" type="text/css" href="/tests/SimpleTest/test.css">

</head>

<body>

<iframe id="subframe"></iframe>

<pre id="log">

<script>

SimpleTest.waitForExplicitFinish();

async function runTest() {

  let f = new FontFace("Ahem", "url(Ahem.ttf)", {});

  await f.load();

  is(f.status, "loaded", "Loaded Ahem font");

  let subframe = document.getElementById("subframe");

  subframe.src = "file_bug1375944.html";

  await new Promise(resolve => subframe.onload = resolve);

  let elem = subframe.contentDocument.getElementById("test");

  is(elem.getBoundingClientRect().width, 64,

     "The font should be loaded properly");

  SimpleTest.finish();

runTest();

</script>

</pre>

</body>

</html>