layout/generic/crashtests/1965081-iframe.html (18 lines of code) (raw):
<!DOCTYPE html>
<style>
:root {display: grid;}
*:only-child { margin: 63% }
*::first-line { }
#a { align-self: baseline }
</style>
<script>
addEventListener("DOMContentLoaded", () => {
c.insertBefore(b, null);
})
</script>
<dl>
<video id="a" controls="" src="data:image/gif;base64,R0lGODlhAQABAAD/ACwAAAAAAQABAAACADs="></video>
<svg>
<text id="b"></text>
<font-face-src id="c">
</svg>