wpt / css / compositing / parsing / background-blend-mode-computed.html

Status: PASS | Duration: 73ms | Subtests: 19/19 | Open test on wpt.live | wpt.fyi

TestTest SourceSubtests (19/19)

Data from commit:
a50cb89 wpt: run reference-named files which are themselves tests (#836) (2026-09-03)

SubtestStatusMessage
Property background-blend-mode value 'normal'PASS
Property background-blend-mode value 'multiply'PASS
Property background-blend-mode value 'screen'PASS
Property background-blend-mode value 'overlay'PASS
Property background-blend-mode value 'darken'PASS
Property background-blend-mode value 'lighten'PASS
Property background-blend-mode value 'color-dodge'PASS
Property background-blend-mode value 'color-burn'PASS
Property background-blend-mode value 'hard-light'PASS
Property background-blend-mode value 'soft-light'PASS
Property background-blend-mode value 'difference'PASS
Property background-blend-mode value 'exclusion'PASS
Property background-blend-mode value 'hue'PASS
Property background-blend-mode value 'saturation'PASS
Property background-blend-mode value 'color'PASS
Property background-blend-mode value 'luminosity'PASS
Property background-blend-mode value 'normal, luminosity'PASS
Property background-blend-mode value 'screen, overlay'PASS
Property background-blend-mode value 'color, saturation'PASS

/css/compositing/parsing/background-blend-mode-computed.html

<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<title>Compositing and Blending Level 1: getComputedStyle().backgroundBlendMode</title>
<link rel="help" href="https://drafts.fxtf.org/compositing-1/#propdef-background-blend-mode">
<meta name="assert" content="background-blend-mode computed value is as specified.">
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
<script src="/css/support/computed-testcommon.js"></script>
</head>
<body>
<div id="target"></div>
<script>
test_computed_value("background-blend-mode", "normal");
test_computed_value("background-blend-mode", "multiply");
test_computed_value("background-blend-mode", "screen");
test_computed_value("background-blend-mode", "overlay");
test_computed_value("background-blend-mode", "darken");
test_computed_value("background-blend-mode", "lighten");
test_computed_value("background-blend-mode", "color-dodge");
test_computed_value("background-blend-mode", "color-burn");
test_computed_value("background-blend-mode", "hard-light");
test_computed_value("background-blend-mode", "soft-light");
test_computed_value("background-blend-mode", "difference");
test_computed_value("background-blend-mode", "exclusion");
test_computed_value("background-blend-mode", "hue");
test_computed_value("background-blend-mode", "saturation");
test_computed_value("background-blend-mode", "color");
test_computed_value("background-blend-mode", "luminosity");

// Per spec, excess values should not be used,
// BUT the computed style should be similar to the specified values.
// see https://drafts.fxtf.org/compositing-1/#background-blend-mode
// and https://drafts.csswg.org/css-backgrounds-3/#layering
// > The lists are matched up from the first value: excess values at the end are not used.
// but in https://drafts.csswg.org/css-values-4/#linked-properties
// it was decided that
// > The computed values of the coordinating list properties are not affected by such truncation or repetition.
//
// There is a distinction between specified values, used values, and computed values.

test_computed_value("background-blend-mode", "normal, luminosity");
test_computed_value("background-blend-mode", "screen, overlay");
test_computed_value("background-blend-mode", "color, saturation");
</script>
</body>
</html>