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<!DOCTYPE HTML>
<html>
<head>
<meta charset="utf-8">
<title>Changing content targetting :has-slotted through multiple shadow roots</title>
<link rel="help" href="https://github.com/w3c/csswg-drafts/pull/10586">
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
<script src="/resources/testdriver.js"></script>
<script src="/resources/testdriver-vendor.js"></script>
<script src="/resources/testdriver-actions.js"></script>
</head>
<body>
<my-element id="test">Test</my-element>
<template id="myTemplate">
<slot></slot>
<p id="target">This text will be styled.</p>
<style>
p {
color: rgb(0 255 0);
}
slot:not(:has-slotted) + p {
color: rgb(0 0 255);
}
</style>
</template>
<script>
customElements.define('my-element', class extends HTMLElement {
constructor() {
super();
this.attachShadow({
mode: 'open',
slotAssignment: 'manual',
});
this.shadowRoot.append(myTemplate.content.cloneNode(true));
}
get slot() {
return this.shadowRoot.querySelector('slot');
}
});
const blue = 'rgb(0, 0, 255)';
const green = 'rgb(0, 255, 0)';
test(function (t) {
const test = document.getElementById('test');
const target = test.shadowRoot.getElementById('target');
t.add_cleanup(() => { test.innerHTML = 'Test' });
let styles = getComputedStyle(target);
assert_equals(styles.getPropertyValue('color'), blue);
}, "empty node is blue");
test(function (t) {
const test = document.getElementById('test');
const target = test.shadowRoot.getElementById('target');
t.add_cleanup(() => { test.innerHTML = 'Test' });
test.slot.assign(test.childNodes[0])
styles = getComputedStyle(target);
assert_equals(test.slot.assignedNodes().length, 1);
assert_equals(styles.getPropertyValue('color'), green);
test.slot.assign()
styles = getComputedStyle(target);
assert_equals(styles.getPropertyValue('color'), blue);
}, "manually assigning a text node is green, emptying assignment is blue");
test(function (t) {
const test = document.getElementById('test');
const target = test.shadowRoot.getElementById('target');
t.add_cleanup(() => { test.innerHTML = 'Test' });
test.innerHTML = '<div></div>';
assert_equals(styles.getPropertyValue('color'), blue);
test.slot.assign(...test.children)
styles = getComputedStyle(target);
assert_equals(test.slot.assignedNodes().length, 1);
assert_equals(styles.getPropertyValue('color'), green);
test.slot.assign()
styles = getComputedStyle(target);
assert_equals(styles.getPropertyValue('color'), blue);
}, "manually assigning a Element is green, emptying assignment is blue");
</script>
</body>
</html>
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