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<!doctype html>
<title>::part():dir() invalidation</title>
<link rel="author" title="Keith Cirkel" href="mailto:wpt@keithcirkel.co.uk" />
<link rel="help" href="https://drafts.csswg.org/css-shadow-parts/#part" />
<link rel="help" href="https://github.com/whatwg/html/pull/8467" />
<style>
my-element::part(inner) {
background-color: #ff0000;
}
my-element::part(inner):dir(ltr) {
background-color: #00ff00;
}
my-element::part(inner):dir(rtl) {
background-color: #0000ff;
}
</style>
<body>
<my-element id="subject"></my-element>
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
<script>
const RED = "rgb(255, 0, 0)";
const GREEN = "rgb(0, 255, 0)";
const BLUE = "rgb(0, 0, 255)";
customElements.define(
"my-element",
class MyElement extends HTMLElement {
connectedCallback() {
this.attachShadow({
mode: "open",
}).innerHTML = `<div part="inner">Test</div>`;
this.elementInternals = this.attachInternals();
}
get inner() {
return this.shadowRoot.querySelector("[part=inner]");
}
},
);
test((t) => {
t.add_cleanup(() => {
subject.inner.lang = null;
});
assert_equals(getComputedStyle(subject.inner).backgroundColor, GREEN);
subject.inner.dir = "rtl";
assert_equals(getComputedStyle(subject.inner).backgroundColor, BLUE);
subject.inner.dir = "ltr";
assert_equals(getComputedStyle(subject.inner).backgroundColor, GREEN);
}, "::part():dir() invalidation");
test((t) => {
t.add_cleanup(() => {
subject.removeAttribute("dir");
});
assert_equals(getComputedStyle(subject.inner).backgroundColor, GREEN);
subject.inner.setAttribute("dir", "rtl");
assert_equals(getComputedStyle(subject.inner).backgroundColor, BLUE);
subject.inner.removeAttribute("dir");
assert_equals(getComputedStyle(subject.inner).backgroundColor, GREEN);
}, "::part():dir() invalidation from setAttribute");
</script>
</body>
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