https://lists.w3.org/Archives/Public/public-css-archive/2018Jun/0552.html
[csswg-drafts] Pull Request: [css-contain] property names linkified from Eric Willigers via GitHub...
https://bugzilla.mozilla.org/show_bug.cgi?id=464222
464222 - Relative links not linkified in "View Selection Source"
RESOLVED (jkitch.bug) in Core - DOM: HTML Parser. Last updated 2014-02-20.
relative linksview selectionsource