<html>
This test makes sure FontFaceSets don't access deleted documents. The test passes if there is no crash when running under ASan.
<script>

d = document.implementation.createDocument(null, '');
f = new FontFace('f', 'local(F)', {});
ffs = d.fonts;
delete d;
// gc();
GCController.collect();

// trigger use after free
ffs.add(f);
</script>
</html>