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<!doctype html>
<meta charset="utf-8">
<title>Emulation of color-scheme (bug 1570721)</title>
<script src="/tests/SimpleTest/SimpleTest.js"></script>
<link rel="stylesheet" type="text/css" href="/tests/SimpleTest/test.css" />
<style>
@media (prefers-color-scheme: light) {
#test { color: rgb(0, 1, 0); }
}
@media (prefers-color-scheme: dark) {
#test { color: rgb(0, 2, 0); }
}
</style>
<div id="test"></div>
<script>
function colorId() {
// Gets the middle number of the rgb(0, x, 0) color.
let color = getComputedStyle(document.getElementById("test")).color;
let id = parseInt(color.split(",")[1], 10);
ok(id == 1 || id == 2 || id == 3, "Bogus color?");
return id;
}
{
let bc = SpecialPowers.wrap(window).browsingContext.top;
ok('prefersColorSchemeOverride' in bc, "API should exist");
is(bc.prefersColorSchemeOverride, "none", "Override shouldn't be active.");
let originalColor = colorId();
bc.prefersColorSchemeOverride = "light";
is(colorId(), 1, "Light emulation works");
bc.prefersColorSchemeOverride = "dark";
is(colorId(), 2, "Dark emulation works");
bc.prefersColorSchemeOverride = "none";
is(colorId(), originalColor, "Clearing the override works");
}
</script>
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