- Spacing in CSS for human readability breaks the syntax highlighting:
<syntaxhighlight lang="CSS" inline>margin-top: 0; margin-bottom: -0.5em;</syntaxhighlight>
shows up almost entirely green.
- If you run all the code together into a blob, it starts working, but it doesn't work properly for a value like -0.5em:
<syntaxhighlight lang="CSS" inline>margin-top:0;margin-bottom:-0.5em;</syntaxhighlight>
That is mis-parsing the -0.5em value as a separate -0 (no such thing) and turning it purple, followed by a .5em, in blue. This effect is even partially visible if you render the first example above: the entire code block is green except .5em.
Conditions: Just using <syntaxhighlight> at en.wikipedia.org. For a quick look at these examples in rendered form, see them in the table after the first block of discussion at https://en.wikipedia.org/w/index.php?title=User_talk:N%C3%B8kkenbuer&oldid=847447251#Misuse_of_syntax_highlighting