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<!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>
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