Hmmm... ran into one ebook today where the modified sanity check throws an error. The line reads:
Code:
<p class="center"><a href="https://alsoby.me/r/amazon/B07BZM62LQ?fc=us&ds=1"><span class="underline">THE UNBELIEVABLE MR. BROWNSTONE</span></a></p>
Removing the equal signs from '?fc=us&ds=1' stops the error from occurring. Just removing the entire string seems to have no effect on opening the URL.
Edit: Also add this line as one that triggers an error message from sanity check:
Code:
<meta http-equiv="Content-Type" content="text/html; charset=utf-8"/>