Add css style for broken page links in ckeditor
With the old rtehtmlarea broken links (at least page links which linked to not existing page) where displayed differently with a red border and yellow background. This is no longer working with ckeditor.
The broken links are apparently already marked with an additional attribute (see RteHtmlParser::markBrokenLinks):
<a data-rte-error= ...
If CSS for <a> elements with this attribute are added in the rte_ckeditor, the broken links could be visually displayed as broken links.
The style ('background-color: yellow; border:2px red solid; color: black;') that is added in RteHtmlParser::markBrokenLinks is probably removed by ckeditor.
Updated by Sybille Peters about 3 years ago
The patch needs more work, please also see https://typo3.slack.com/archives/C03AM9R17/p1526289651000331