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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>
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