Looking back at my line numbering plugin for Prism, I realized that it's working too hard by manipulating the DOM. Prism works by string manipulation anyway, so there's no harm in using that to wrap the lines rather than searching through elements. The code is now only 6 lines long. It still uses CSS and ::before pseudoelements to show the line numbers.
Hacking at 0300
Thoughts on web design and programming from a very occasional volunteer webmaster
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