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Test Info:
- This WPT test may be referenced by the following Test IDs:
- /custom-elements/state/state-css-selector-shadow-dom.html - WPT Dashboard Interop Dashboard
<!doctype html>
<html>
<head>
<meta charset="utf-8" />
<meta name="timeout" content="long" />
<meta
name="author"
title="Keith Cirkel"
href="mailto:wpt@keithcirkel.co.uk"
/>
<link rel="help" href="https://html.spec.whatwg.org/multipage/custom-elements.html#custom-state-pseudo-class" />
<title>:state() css selector applies in shadow roots</title>
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
</head>
<body>
<custom-state id="myCE"> I should be green </custom-state>
<style></style>
<script>
customElements.define(
"custom-state",
class extends HTMLElement {
connectedCallback() {
this.elementInternals = this.attachInternals();
const css = new CSSStyleSheet();
css.replaceSync(`
:host {
color: #f00;
}
:host(:state(green)) {
color: #0f0;
}
`);
this.attachShadow({ mode: "open" }).adoptedStyleSheets.push(css);
}
},
);
test(function () {
assert_false(myCE.elementInternals.states.has("green"));
assert_equals(
getComputedStyle(myCE).getPropertyValue("color"),
"rgb(255, 0, 0)",
);
}, "state selector has no influence when state is not applied");
test(function (t) {
myCE.elementInternals.states.add("green");
t.add_cleanup(() => {
myCE.elementInternals.states.delete("green");
});
assert_true(myCE.elementInternals.states.has("green"));
assert_equals(
getComputedStyle(myCE).getPropertyValue("color"),
"rgb(0, 255, 0)",
);
}, "state selector has influence when state is applied");
test(function (t) {
myCE.elementInternals.states.add("foo");
t.add_cleanup(() => {
myCE.elementInternals.states.delete("foo");
});
assert_false(myCE.elementInternals.states.has("green"));
assert_true(myCE.elementInternals.states.has("foo"));
assert_equals(
getComputedStyle(myCE).getPropertyValue("color"),
"rgb(255, 0, 0)",
);
}, "state selector only applies on given ident");
</script>
</body>
</html>