I'm not sure if this is an actual bug or not, but the SyntaxHighlight box takes up 100% of the page width regardless if there is something else in the way on the page. For instance, on https://www.mediawiki.org/wiki/Extension:SyntaxHighlight_GeSHi the first usage instance ducks under the infobox. Likewise on https://en.wikipedia.org/wiki/HTML_element.
I'm using Chrome 42 on Yosemite, it was originally reported on OTRS (ticket 2015050310010375) by someone using SeaMonkey 2.26.1 on XP SP3.
| Status | Subtype | Assigned | Task | ||
|---|---|---|---|---|---|
| Resolved | TheDJ | T98338 SyntaxHighlight box forces 100% width; can end up hidden below under other HTML elements | |||
| Resolved | Krinkle | T2260 Vector: Handle <pre> overflow with a scrollbar or wrapping | |||
| Resolved | ori | T85794 Convert SyntaxHighlight_Geshi from Geshi to Pygments (was: Don't register 250+ modules) | |||
| Resolved | ssastry | T40800 Tidy should not create (additional) white space between elements |
This has been a known problem since 2004 and is tracked as T2260.
It's one of those issues that has seen some 4 attempts to fix it over that last ten years, all of them reverted because of negative side effects.