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<meta charset="utf-8">
<title>CSS Color Level 4: Parsing and serialization of colors using valid HWB notation</title>
<link rel="help" href="https://drafts.csswg.org/css-color-4/#the-hwb-notation">
<link rel="help" href="https://drafts.csswg.org/css-color-4/#resolving-sRGB-values">
<link rel="help" href="https://drafts.csswg.org/css-color-4/#serializing-sRGB-values">
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
<script src="/css/support/parsing-testcommon.js"></script>
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<script>
test_valid_value("color", "hwb(120 30% 50%)", "rgb(77, 128, 77)");
test_valid_value("color", "hwb(120 30% 50% / 0.5)", "rgba(77, 128, 77, 0.5)");
test_valid_value("color", "hwb(none none none)", "rgb(255, 0, 0)");
test_valid_value("color", "hwb(0 0% 0%)", "rgb(255, 0, 0)");
test_valid_value("color", "hwb(none none none / none)", "rgba(255, 0, 0, 0)");
test_valid_value("color", "hwb(0 0% 0% / 0)", "rgba(255, 0, 0, 0)");
test_valid_value("color", "hwb(120 none none)", "rgb(0, 255, 0)");
test_valid_value("color", "hwb(120 0% 0%)", "rgb(0, 255, 0)");
test_valid_value("color", "hwb(120 80% none)", "rgb(204, 255, 204)");
test_valid_value("color", "hwb(120 80% 0%)", "rgb(204, 255, 204)");
test_valid_value("color", "hwb(120 none 50%)", "rgb(0, 128, 0)");
test_valid_value("color", "hwb(120 0% 50%)", "rgb(0, 128, 0)");
test_valid_value("color", "hwb(120 30% 50% / none)", "rgba(77, 128, 77, 0)");
test_valid_value("color", "hwb(120 30% 50% / 0)", "rgba(77, 128, 77, 0)");
test_valid_value("color", "hwb(none 100% 50% / none)", "rgba(170, 170, 170, 0)");
test_valid_value("color", "hwb(0 100% 50% / 0)", "rgba(170, 170, 170, 0)");

// Test that rounding happens properly. hwb(320deg 30% 40%) in sRGB has a blue
// channel of exactly one-half.
// 0.5 * 255 = 127.5. This value should be rounded UP to 128, not down to 127.
test_valid_value("color", "hwb(320deg 30% 40%)", "rgb(153, 77, 128)");
</script>
</body>
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