external links looking identical or near-identical to diffs can potentially be exploited
eg:
"Look at these vandal diffs:
[https://en.wikipedia.org/w/index.php?title=Wikipedia:Administrators%27_noticeboard/Incidents&diff=prev&oldid=0000000000] [https://en.wikipedia.org/w/index.php?title=Example&diff=0000000000&oldid=0000000000] [etc diffs] [http://en.wikipebia.biz/wiki/Special:Nuke/ClueBot] [irc://w3.org:6667] https://en.wikipedia.org/wiki/Special:UserLogoutUser]][https://en.wikipedia.org/w/index.php?title=Wikipedia:Adrninitsrators%27_noticeboard/lncidents&diff=prev&oldid=0000000000] something ~~~~"
at least some users when given a lot of diffs (like 5 or more) click them fast to open in new tabs without looking very closely at each url
fake el can be used maliciously (list of obvious examples goes here)
- this may (?) be done with templates or css
suggest making external links visually different not only in color (because that doesn't help users who override colors for accessibility, with customized stylesheets? etc)
- in text, such as [1] [2] [3] [ 4-ext ] [5], the 4th being marked differently
- displaying full url if not on a wikimedia site
- making external links non-clickable but text
- text in fixed-width font without homoglyphs
- other solutions etc