overlay-user-agent-rules.html

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This test has a WPT meta file that expects 4 subtest issues.
This WPT test may be referenced by the following Test IDs:
- /css/css-position/overlay/overlay-user-agent-rules.html - WPT Dashboard Interop Dashboard

<!DOCTYPE html>

<link rel=author href="mailto:jarhar@chromium.org">

<link rel=help href="https://github.com/whatwg/html/pull/9093">

<link rel=help href="https://drafts.csswg.org/css-position-4/#overlay">

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

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

<title>CSS Position Test: User agent style for overlay</title>

<style>

div {

  overlay: auto;

</style>

<body>

<script>

test(() => {

  const div = document.createElement('div');

  document.body.appendChild(div);

  div.style.overlay = 'auto';

  assert_equals(getComputedStyle(div).overlay, 'none');

}, 'HTML elements should have overlay:none !important from the user-agent.');

test(() => {

  const svg = document.createElement('svg');

  document.body.appendChild(svg);

  svg.style.overlay = 'auto';

  assert_equals(getComputedStyle(svg).overlay, 'none');

}, 'SVG elements should have overlay:none !important from the user-agent.');

test(() => {

  const nullNamespace = document.createElementNS(null, 'div');

  document.body.appendChild(nullNamespace);

  assert_equals(getComputedStyle(nullNamespace).overlay, 'none');

}, 'Null namespace elements should have overlay:none !important from the user-agent.');

test(() => {

  const weirdNamespace = document.createElementNS('hello world', 'div');

  document.body.appendChild(weirdNamespace);

  assert_equals(getComputedStyle(weirdNamespace).overlay, 'none');

}, 'Arbitrary namespace elements should have overlay:none !important from the user-agent.');

</script>