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<!doctype html>
<meta charset="utf-8">
<title>Test InspectorUtils::isUsedColorSchemeDark</title>
<script src="/tests/SimpleTest/SimpleTest.js"></script>
<link rel="stylesheet" href="/tests/SimpleTest/test.css"/>
<meta name="color-scheme" content="light dark">
<div id="dark" style="color-scheme: dark"></div>
<div id="light" style="color-scheme: light"></div>
<div id="preferred" style="color-scheme: light dark"></div>
<div id="default"></div>
<script>
const InspectorUtils = SpecialPowers.InspectorUtils;
function testElement(id, dark) {
is(InspectorUtils.isUsedColorSchemeDark(document.getElementById(id)), dark, id + " should " + (dark ? "" : "not ") + "be dark");
}
const meta = document.querySelector('meta[name="color-scheme"]');
function runTests() {
const prefersDark = matchMedia("(prefers-color-scheme: dark)").matches;
info(`testing with meta ${meta.content} and preference ${prefersDark ? "dark" : "light"}`);
testElement("dark", true);
testElement("light", false);
testElement("preferred", prefersDark);
testElement("default", meta.content.includes("dark") && (!meta.content.includes("light") || prefersDark));
}
function waitForColorSchemeToBe(scheme) {
return new Promise(resolve => {
let mq = matchMedia(`(prefers-color-scheme: ${scheme})`);
if (mq.matches) {
resolve();
} else {
mq.addEventListener("change", resolve, { once: true });
}
});
}
async function switchColorScheme(dark) {
await SpecialPowers.pushPrefEnv({ set: [["layout.css.prefers-color-scheme.content-override", dark ? 0 : 1]] });
await waitForColorSchemeToBe(dark ? "dark" : "light");
}
add_task(async function() {
runTests();
for (let dark of [false, true]) {
for (let metaValue of ["light", "dark", "light dark"]) {
meta.setAttribute("content", metaValue);
await switchColorScheme(dark);
runTests();
}
}
});
</script>
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