chromium/third_party/blink/web_tests/fast/parser/resources/badentity.xhtml

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Strict//EN" "xhtml1-strict.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<body>
Test: &badEntity;
If you don't crash, you pass.
</body>
</html>