offscreen-canvas-outlives-font-selector.html

<!doctype html>
<title>Should not crash when OffscreenCanvas outlives FontSelector</title>
<script src="../../resources/testharness.js"></script>
<script src="../../resources/testharnessreport.js"></script>
<body>
<script>
promise_test(async function() {
  assert_implements(window.gc, 'This test requires forced GC');
  assert_implements(navigator.storage, 'This test requires navigator.storage');

  // Set up a canvas and cache a font there
  var iframe = document.body.appendChild(document.createElement('iframe'));
  var canvas = new iframe.contentWindow.OffscreenCanvas(400, 300);
  var context = canvas.getContext('2d');
  context.measureText('text');

  // Remove the owner document and run GC to remove FontFallbackMap
  iframe.remove();
  window.gc();
  await navigator.storage.estimate();

  context.measureText("text");
}, 'Should not crash when re-accessing the font after the document is gone');

promise_test(async function() {
  assert_implements(window.gc, 'This test requires forced GC');
  assert_implements(navigator.storage, 'This test requires navigator.storage');

  // Set up a canvas and cache a font there
  var iframe = document.body.appendChild(document.createElement('iframe'));
  var canvas = new iframe.contentWindow.OffscreenCanvas(400, 300);
  var context = canvas.getContext('2d');
  context.letterSpacing = '1px';

  // Remove the owner document and run GC to remove FontFallbackMap
  iframe.remove();
  window.gc();
  await navigator.storage.estimate();

  // Should not crash when setting a new font
  context.font = '50% sans-serif';
}, 'Should not crash when setting font after the document is gone');
</script>
</body>
chromium/third_party/blink/web_tests/fast/canvas/offscreen-canvas-outlives-font-selector.html
