This file contains invisible Unicode characters that are indistinguishable to humans but may be processed differently by a computer. If you think that this is intentional, you can safely ignore this warning. Use the Escape button to reveal them.
./test/HTML/758606.html:1: HTML parser error : Invalid char in comment 0xC
<!--<!doctype
^
./test/HTML/758606.html:2: HTML parser error : Comment not terminated