Here's an interesting one for mobile web sites…
I am using remote content assets to pull in the email and telephone search tools our uni uses, repackaging them in a mobile friendly (XHTML-MP) design.
It all works swimmingly for the email search, the tunnelling settings (URLs under/in same domain) work perfectly and they correctly ignore mailto: hrefs, creating direct email links.
The telephone search, with the same tunnelling settings, strikes a major hurdle. I'm using the tel: protocol, which is part of XHTML-MP to make numbers 'clickable', but unlike the mailto: urls, matrix cloaks these, breaking them completely.
Any ideas?
You could possibly log this as a bug, but it wouldn't get fixed in v3.12 of Matrix, as that is no longer supported.