File: attribute.html

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<!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>