See [https://fr.wikipedia.org/w/index.php?title=Alexis_Galp%C3%A9rine&diff=prev&oldid=119818187 this edit] (and also other edits on this article) :
- Forbidden <a> tag
- With an ISBN converted into a telephone number
- With parsoid attributes
iOS has a feature which detects patterns of numbers in an HTML document and automatically turns these into tel:// links when rendering a page on an iOS device. This in combination with VisualEditor sometimes leads to tel:// links being inserted by VisualEditor as it converts the HTML document back to wikitext.
As tel:// links are supported and allowed in wikitext and because the html links have no distinguishing features they are currently not filtered out because they might be legitimate content..
A fix was attempted earlier by disallowing this automatic detection in {T256758} but it seems that this hint does not transfer to the visual editor documents we are handling.