Quick check what entities is allowed between two slashes in regards to a protocol "//"
<a href="/$[data1]/test.com/" id=x></a>if(x.host == "test.com")log('$[data1]')<a href="/\/test.com/" id=x></a><a href="/
/test.com/" id=x></a><a href="///test.com/" id=x></a><a href="/	/test.com/" id=x></a>