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<!DOCTYPE html>
<title>@scope - invalidation</title>
<link rel="help" href="https://drafts.csswg.org/css-cascade-6/#scope-atrule">
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
<script>
function test_scope_invalidation(script_element, callback_fn, description) {
test((t) => {
// The provided <script> element must be an immedate subsequent sibling of
// a <template> element.
let template_element = script_element.previousElementSibling;
assert_equals(template_element.tagName, 'TEMPLATE');
t.add_cleanup(() => {
while (main.firstChild)
main.firstChild.remove()
});
main.append(template_element.content.cloneNode(true));
callback_fn();
}, description);
}
function assert_green(element) {
assert_equals(getComputedStyle(element).backgroundColor, 'rgb(0, 128, 0)');
}
function assert_not_green(element) {
assert_equals(getComputedStyle(element).backgroundColor, 'rgb(0, 0, 0)');
}
</script>
<style>
main * {
background-color: black;
}
</style>
<main id=main>
</main>
<!-- Tests follow -->
<template>
<style>
@scope (.a) {
span { background-color: green; }
}
</style>
<div>
<span></span>
</div>
</template>
<script>
test_scope_invalidation(document.currentScript, () => {
let div = main.querySelector('div');
let span = main.querySelector('div > span');
assert_not_green(span);
div.classList.add('a');
assert_green(span);
div.classList.remove('a');
assert_not_green(span);
}, 'Element becoming scope root');
</script>
<template>
<style>
@scope (.a) {
.b { background-color: green; }
}
</style>
<div class=b></div>
</template>
<script>
test_scope_invalidation(document.currentScript, () => {
let b = main.querySelector('.b');
assert_not_green(b);
b.classList.add('a');
assert_green(b);
b.classList.remove('a');
assert_not_green(b);
}, 'Element becoming scope root, with inner selector matching that root');
</script>
<template>
<style>
@scope (.a) to (.b) {
span { background-color: green; }
}
</style>
<div class=a>
<div>
<span></span>
</div>
</div>
</template>
<script>
test_scope_invalidation(document.currentScript, () => {
let inner_div = main.querySelector('.a > div');
let span = main.querySelector('.a > div > span');
assert_green(span);
inner_div.classList.add('b');
assert_not_green(span);
inner_div.classList.remove('b');
assert_green(span);
}, 'Element becoming scope limit');
</script>
<template>
<style>
@scope (.a) {
@scope (.b) {
span { background-color: green; }
}
}
</style>
<div>
<div>
<span></span>
</div>
</div>
</template>
<script>
test_scope_invalidation(document.currentScript, () => {
let outer_div = main.querySelector(':scope > div');
let inner_div = main.querySelector(':scope > div > div');
let span = main.querySelector('div > div > span');
assert_not_green(span);
outer_div.classList.add('a');
assert_not_green(span);
inner_div.classList.add('b');
assert_green(span);
// Toggle .b while .a remains.
inner_div.classList.remove('b');
assert_not_green(span);
inner_div.classList.add('b');
assert_green(span);
// Toggle .a while .b remains.
outer_div.classList.remove('a');
assert_not_green(span);
outer_div.classList.add('a');
assert_green(span);
}, 'Toggling inner/outer scope roots');
</script>
<template>
<style>
@scope (.a) {
:scope { background-color:green; }
}
</style>
<div></div>
</template>
<script>
test_scope_invalidation(document.currentScript, () => {
let div = main.querySelector('main > div');
assert_not_green(div);
div.classList.add('a');
assert_green(div);
div.classList.remove('a');
assert_not_green(div);
}, 'Element becoming root, with :scope in subject');
</script>
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