FORUM Gesellschaft für Informationssicherheit mbH

We'd very much prefer including the polyfill as it is tiny and avoids the nasty exceptions in IE11.

We're seeing the same issue, although only occasionally. Any updates / ideas what is causing this error?

Hello Mike, sorry for the wait. Our goal was indeed to be able to require certain attributes when their element would make no sense or as in this case even...

Hello Mike, I added a TestCase for the disallowWithoutAttribute() functionality that represents the constellation that caused us problems (arbitrary alt, missing src). Best regards, Sebastian