Content - a0734f97acc2cca500f280a58fab69fd8b26c778 - 2acfc38/paint-timing/paint-visited.html

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Tip revision: 5714cf6b90a4549afee19fcc37b0633d327e1cd0 authored by Alex Moshchuk on 12 April 2018, 18:55:42 UTC
Use PostTask to schedule cross-process postMessage forwarding.

Tip revision: 5714cf6

paint-visited.html

<!DOCTYPE html>
<style>
  a:visited {
    color:white;
  }
</style>
<body>
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
<a id="link" href="./">link</a>
<script>
/* This test ensures that an empty page is painted when there is an invisible visited link (that would be visible if the link was not visited). It's necessary that whether the page is painted or not does not depend on visitedness of the link. Otherwise the paint-timing API could be used to sniff whether a link has been visited or not. */
window.onload = function() {
  /* Convenience helper to get the link into the browsing history.
    Using a relative path because some browsers only allow replaceState within the same domain. */
  current_url = window.location.href;
  history.replaceState({}, "", "./");
  history.replaceState({}, "", current_url);
}
async_test(function(t) {
  function testPaintEntries() {
      const bufferedEntries = performance.getEntriesByType('paint');
      if (bufferedEntries.length < 2) {
          t.step_timeout(function() {
              testPaintEntries();
          }, 20);
          return;
      }
      t.step(function() {
          assert_equals(bufferedEntries.length, 2, "FP and FCP.");
          assert_equals(bufferedEntries[0].entryType, "paint");
          assert_equals(bufferedEntries[0].name, "first-paint");
          assert_equals(bufferedEntries[1].entryType, "paint");
          assert_equals(bufferedEntries[1].name, "first-contentful-paint");
          t.done();
      });
  }
  t.step(function() {
      testPaintEntries();
  });
}, "Visited-attack test to check existence of FP and FCP.");
</script>
</body>

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