LayoutTests/fast/css/cssom-mask-border-width-crash.html

<script>
window.testRunner?.dumpAsText();

const n2 = document.createElement('div');
document.documentElement.appendChild(n2);
n2.attributeStyleMap.set('accent-color', document.documentElement.computedStyleMap().get('mask-border-width'));
</script>
This test passes if it doesn't crash.