This is an example how you can use the XSS type to fuzz URLs. It uses a base tag to get round the sandboxed iframe problems.
<script>window.onerror=x=>true;</script>0x0D
<base href="https://example.com" /><a href="/$[data1]/example2.com" id=x></a>x.host === "example2.com" && log('$[data1]')<a href="/\/example2.com" id=x></a><a href="/
/example2.com" id=x></a><a href="///example2.com" id=x></a><a href="/	/example2.com" id=x></a>