stale-css.html - mozsearch

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This test has a WPT meta file that expects 1 subtest issues.
This WPT test may be referenced by the following Test IDs:
- /fetch/stale-while-revalidate/stale-css.html - WPT Dashboard Interop Dashboard

<!DOCTYPE html>

<meta charset="utf-8">

<title>Tests Stale While Revalidate works for css</title>

<script src="/resources/testharness.js"></script>

<script src="/resources/testharnessreport.js"></script>

<script src="/common/utils.js"></script>

<body>

<script>

var request_token = token();

let link_src = "./resources/stale-css.py?token=" + request_token;

let loadLink = async() => {

  let link = document.createElement("link");

  link.rel = "stylesheet";

  link.type = "text/css";

  link.href = "resources/stale-css.py?token=" + request_token;

  let loaded = new Promise(r => link.onload = r);

  document.body.appendChild(link);

  await loaded;

  return window

    .getComputedStyle(document.body)

    .getPropertyValue('background-color');

};

promise_test(async t => {

  await new Promise(r => window.onload = r);

  let bgColor1 = await loadLink();

  assert_equals(bgColor1, "rgb(0, 128, 0)", "(initial version loaded)");

  let bgColor2 = await loadLink();

  assert_equals(bgColor2, "rgb(0, 128, 0)", "(stale version loaded)");

  // Query the server again and again. At some point it must have received the

  // revalidation request. We poll, because we don't know when the revalidation

  // will occur.

  while(true) {

    await new Promise(r => step_timeout(r, 25));

    let response = await fetch(link_src + "&query");

    let count = response.headers.get("Count");

    if (count == '2')

      break;

  let bgColor3 = await loadLink();

  assert_equals(bgColor3, "rgb(255, 0, 0)", "(revalidated version loaded)");

}, 'Cache returns stale resource');

</script>

</body>