Created attachment 44609 [details]
Screenshot of bahn.de calendar with green notes indicating the problem
The calendar on bahn.de to pick your travel date lacks its previous month / next month arrows when displayed in WebKit (seen in both the 4.0.4 (6531.21.10, r51939) nightly and Google Chrome 184.108.40.206 and many previous versions). This means you cannot use the calendar provided by the site to do anything outside the current month.
See the attached screenshot for an illustration.
bahn.de is Germany's railway website. It's used by loads of people (including those from other European countries as bahn.de provides timetables for the whole continent as most of the other countries' railway sites are horrible).
Created attachment 44623 [details]
reduced test case
This site tries setting innerHTML to "»" instead of "»". This is a mistake, but it's harmless in other browsers, so it should be harmless in WebKit, too.
Not sure when this was resolved, but it appears to work fine in r70732.
Almost certainly fixed by HTML5 tokenizer.