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Test Info:
- This WPT test may be referenced by the following Test IDs:
- /html/canvas/element/global-hdr-headroom/attribute.html - WPT Dashboard Interop Dashboard
<!DOCTYPE HTML>
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
<script>
test(function() {
// Test setting, getting, and default values of globalHDRHeadroom
const canvas = new OffscreenCanvas(64, 64);
const ctx = canvas.getContext('2d');
if (ctx.globalHDRHeadroom !== undefined) {
// Default value is 0.
assert_equals(ctx.globalHDRHeadroom, 0);
// Negative and NaN values are rejected.
ctx.globalHDRHeadroom = -1.0;
assert_equals(ctx.globalHDRHeadroom, 0);
ctx.globalHDRHeadroom = NaN;
assert_equals(ctx.globalHDRHeadroom, 0);
ctx.globalHDRHeadroom = -Infinity;
assert_equals(ctx.globalHDRHeadroom, 0);
// Nonnegative values are not rejected.
ctx.globalHDRHeadroom = 1;
assert_equals(ctx.globalHDRHeadroom, 1);
ctx.globalHDRHeadroom = 0;
assert_equals(ctx.globalHDRHeadroom, 0);
// Infinity is a valid value.
ctx.globalHDRHeadroom = Infinity;
assert_equals(ctx.globalHDRHeadroom, Infinity);
// Strings from dynamic-range-limit are rejected.
ctx.globalHDRHeadroom = 'constrained';
assert_equals(ctx.globalHDRHeadroom, Infinity);
}
});
</script>