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<!DOCTYPE html>
<title>Test getCSSStyleRules for pseudo elements</title>
<script src="/tests/SimpleTest/SimpleTest.js"></script>
<link rel="stylesheet" href="/tests/SimpleTest/test.css">
<div id="host">
<test-element id="test1" slot="slot1">test1</test-element>
<test-element id="test2" slot="slot2">test2</test-element>
</div>
<script>
const host = document.getElementById("host");
const shadow = host.attachShadow({ mode: "open" });
shadow.innerHTML = `
<style>
#outer ::slotted(test-element) {
color: red;
}
</style>
<div id="outer">
<slot name="slot1"></slot>
</div>
<div id="nested">
<slot name="slot2"></slot>
</div>
`;
const nested = shadow.querySelector("#nested").attachShadow({ mode: "open" });
nested.innerHTML = `
<style>
#inner ::slotted(test-element) {
font-weight: bold;
}
</style>
<div id="inner">
<slot></slot>
</div>
`;
const InspectorUtils = SpecialPowers.InspectorUtils;
function checkElementRules(id, text, property) {
const element = document.getElementById(id);
let slottedRules = InspectorUtils.getCSSStyleRules(element);
is(slottedRules.length, 1, "Slotted element has expected number of rules.");
let slottedText = slottedRules[0].cssText;
ok(slottedText.includes(text), "Slotted node has expected style content.");
ok(slottedText.includes(property), "Has expected property.");
}
info("Check that slotted rules are retrieved");
checkElementRules("test1", "#outer ::slotted(test-element)", "color");
info("Check that slotted rules are also retrieved for nested slots");
checkElementRules("test2", "#inner ::slotted(test-element)", "font-weight");
</script>
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