48 lines
1.8 KiB
HTML
48 lines
1.8 KiB
HTML
<!DOCTYPE HTML>
|
|
<title>CSS Shadow Parts - :host::part() cascading</title>
|
|
<link rel="help" href="https://drafts.csswg.org/css-shadow-parts-1/#part">
|
|
<link rel="help" href="https://drafts.csswg.org/css-scoping-1/#host-selector">
|
|
<link rel="help" href="https://drafts.csswg.org/css-cascade-5/#cascade-sort">
|
|
<link rel="help" href="https://drafts.csswg.org/selectors-4/#specificity">
|
|
<link rel="author" title="L. David Baron" href="https://dbaron.org/">
|
|
<link rel="author" title="Google" href="http://www.google.com/">
|
|
<script src="/resources/testharness.js"></script>
|
|
<script src="/resources/testharnessreport.js"></script>
|
|
|
|
<div id="host"></div>
|
|
|
|
<script>
|
|
|
|
test(function() {
|
|
let host = document.getElementById("host");
|
|
let shadow = host.attachShadow({mode: "open"});
|
|
// Make three rules with equal specificity, so that they cascade by
|
|
// order. Pseudo-elements and elements have the same specificity.
|
|
// Pseudo-classes and attribute selectors have the same specificity.
|
|
shadow.innerHTML = `
|
|
<style>
|
|
div[part="part-name"] {
|
|
color: red;
|
|
}
|
|
:host::part(part-name) {
|
|
color: lime;
|
|
background-color: red;
|
|
}
|
|
div[part="part-name"] {
|
|
background-color: green;
|
|
}
|
|
</style>
|
|
<div part="part-name"></div>
|
|
`;
|
|
|
|
let part_cs = getComputedStyle(shadow.querySelector('div[part="part-name"]'));
|
|
|
|
assert_equals(part_cs.color, "rgb(0, 255, 0)",
|
|
":host::part() selectors override earlier selectors with " +
|
|
"same encapsulation context and specificity");
|
|
assert_equals(part_cs.backgroundColor, "rgb(0, 128, 0)",
|
|
":host::part() selectors are overridden by later selectors " +
|
|
"with same encapsulation context and specificity");
|
|
}, ":host::part has correct cascading behavior");
|
|
|
|
</script>
|