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<!doctype html>
<title>Test for Bug 922669</title>
<script src="/tests/SimpleTest/SimpleTest.js"></script>
<script src="/tests/SimpleTest/EventUtils.js"></script>
<link rel="stylesheet" href="/tests/SimpleTest/test.css">
<script>
function assertMatches(query) {
ok(matchMedia(query).matches, `${query} should match`);
}
function assertPrefersContrastIs(value) {
assertMatches(`(prefers-contrast: ${value})`);
}
add_task(async function setupPrefs() {
assertPrefersContrastIs("no-preference");
await SpecialPowers.pushPrefEnv({
set: [
["browser.display.document_color_use", 2],
["browser.display.use_system_colors", false],
]
});
assertMatches("(prefers-contrast)");
});
async function testColors(foreground, background, expected) {
await SpecialPowers.pushPrefEnv({
set: [
["browser.display.foreground_color", foreground],
["browser.display.background_color", background],
]
});
assertPrefersContrastIs(expected);
// Test the inversed order too.
await SpecialPowers.pushPrefEnv({
set: [
["browser.display.foreground_color", background],
["browser.display.background_color", foreground],
]
});
assertPrefersContrastIs(expected);
}
add_task(async function test_prefers_contrast_colors() {
await testColors("black", "black", "less");
await testColors("black", "white", "more");
await testColors("red", "black", "custom");
});
</script>
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