adoptedstylesheets-observablearray.html

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This WPT test may be referenced by the following Test IDs:
- /css/cssom/adoptedstylesheets-observablearray.html - WPT Dashboard Interop Dashboard

<!DOCTYPE html>

<meta charset="utf-8">

<title>Adoptedstylesheets as ObservableArray</title>

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

<link rel="help" href="https://drafts.csswg.org/cssom/#extensions-to-the-document-or-shadow-root-interface">

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

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

<span id=target>Test Span</span>

<div id="divNonConstructed" class="nonConstructed"></div>

<style>

  #target {background-color: red;}

</style>

<script>

const shadowRootNonConstructed = divNonConstructed.attachShadow({mode:'open'})

nonConstructedStyle = document.createElement("style");

shadowRootNonConstructed.appendChild(nonConstructedStyle);

nonConstructedStyle.sheet.insertRule(".nonConstructed { color: red; }", 0);

const nonConstructedStyleSheet = nonConstructedStyle.sheet;

function assert_is(targetStyle, color) {

  assert_equals(targetStyle.getPropertyValue('background-color'), color);

function testRoot(d, targetStyle) {

  const red = 'rgb(255, 0, 0)';

  const green = 'rgb(0, 255, 0)';

  const blue = 'rgb(0, 0, 255)';

  const sheet1 = new CSSStyleSheet();

  sheet1.replaceSync('#target {background-color:lime !important;}');

  const sheet2 = new CSSStyleSheet();

  sheet2.replaceSync('#target {background-color:blue !important;}');

  assert_equals(d.adoptedStyleSheets.length, 0);

  assert_is(targetStyle, red);

  d.adoptedStyleSheets = [sheet1];

  assert_equals(d.adoptedStyleSheets.length, 1);

  assert_is(targetStyle, green);

  d.adoptedStyleSheets.push(sheet2);

  assert_equals(d.adoptedStyleSheets.length, 2);

  assert_is(targetStyle, blue);

  d.adoptedStyleSheets.pop();

  assert_equals(d.adoptedStyleSheets.length, 1);

  assert_is(targetStyle, green);

  d.adoptedStyleSheets.push(sheet2);

  d.adoptedStyleSheets.reverse();

  assert_equals(d.adoptedStyleSheets.length, 2);

  assert_is(targetStyle, green);

  d.adoptedStyleSheets.splice(1, 1);

  assert_equals(d.adoptedStyleSheets.length, 1);

  assert_is(targetStyle, blue);

  d.adoptedStyleSheets.splice(0, 1, sheet1);

  assert_equals(d.adoptedStyleSheets.length, 1);

  assert_is(targetStyle, green);

  // Adding non-constructed stylesheet to AdoptedStyleSheets is not allowed.

  assert_throws_dom('NotAllowedError', () => { document.adoptedStyleSheets.push(nonConstructedStyleSheet); });

  assert_throws_js(TypeError, () => { document.adoptedStyleSheets.push("foo"); });

test(function() {

  const target = document.querySelector('#target');

  const targetStyle = window.getComputedStyle(target);

  testRoot(document, targetStyle);

}, "document.adoptedStyleSheets should allow mutation in-place");

test(function() {

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

  document.body.appendChild(host);

  const shadow = host.attachShadow({mode: 'open'});

  shadow.innerHTML = '<span id=target>Test Shadow Span</span><style>#target{background-color: red;}</style>';

  const target = shadow.querySelector('#target');

  const targetStyle = window.getComputedStyle(target);

  testRoot(shadow, targetStyle);

}, "shadowRoot.adoptedStyleSheets should allow mutation in-place");

test(function() {

  assert_true(Array.isArray(document.adoptedStyleSheets));

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

  document.body.appendChild(host);

  const shadow = host.attachShadow({mode: 'open'});

  assert_true(Array.isArray(shadow.adoptedStyleSheets));

}, "adoptedStyleSheets should return true for isArray()");

</script>