File: object-view-box-transition-mutation.html

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<!DOCTYPE html>
<title>Unrelated mutation does not affect object-view-box transition</title>
<link rel="help" href="https://drafts.csswg.org/css-images-4/#the-object-view-box">
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
<div id=element>
</div>
<style>
  #element {
    object-view-box: inset(0px);
    transition: object-view-box 100s -50s linear;
  }
</style>
<script>
  test((t) => {
    // Ensure a before-style for element.
    getComputedStyle(element).objectViewBox;
    // Trigger a transition from inset(0px) to inset(20px).
    element.style.objectViewBox = 'inset(20px)';
    assert_equals(getComputedStyle(element).objectViewBox, 'inset(10px)', 'before mutation');
    // Now do a style mutation that's unrelated to the computed value
    // of object-view-box, and check again.
    element.style.setProperty('--x', '1');
    assert_equals(getComputedStyle(element).objectViewBox, 'inset(10px)', 'after mutation');
  }, 'Unrelated mutation does not affect object-view-box transition');
</script>