The new window warnings tooltip has a max-width set on it:
opens a new window
When the warning is not in English, the text goes out of the background as shown on this French website.
French new window warning
Source: https://www.facebook.com/photo?fbid=10239263746556455&set=gm.1578606409971987&idorvanity=517376262761679
See on website: https://weblazilo.fr/a-propos/
This is a duplicate of this EDAC issue: equalizedigital/accessibility-checker#1248