<!DOCTYPE html>
<svg><marker id="x21" viewBox="0,0,0,0"><marker style="clip-path: url(#x18);"></marker></svg>
<svg id="x22"><clipPath id="x18"><line marker-start="url(#x21)"></clipPath></svg>
<script>
window?.testRunner.dumpAsText();
document.querySelector('line').getBoundingClientRect();
document.body.textContent = 'PASS - WebKit did not crash';
</script>
