The square root sign for the L2  norm doesn't show up for example, which is incorrect... see here: https://einsteintoolkit.org/thornguide/CactusNumerical/LocalReduce/documentation.html
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 changed status to open

The issue is, neither Chrome nor Safari supports MathML, which breaks the rendering of equations in Einstein Toolkit documentation. Instead they support MathJax.
Following a separate discussion with Roland, he points out there is a “hybrid” TeX>HTML conversion option that would support both MathJax & MathML:
if we had a new enough htlatex (which we likely don't) then one can get a hybrid: https://tex.stackexchange.com/a/68962
For reference here is the same snippet but rendered in Chrome (84.0.4147.89).

Some more background information: Wikipedia has a list of browsers supporting MathML https://en.wikipedia.org/wiki/MathML) Chrome did support MathML at one point but phased it out https://www.cnet.com/news/googlesubtractsmathmlfromchromeandangermultiplies/
Our server is that generates the HTML pages (from the release branch) is indeed too old to produce mathjax files. It can however produce files that render all equations as images.

Addressed in pull request: https://bitbucket.org/cactuscode/cactus/pullrequests/100/usemathjaxinhtmloutput

Please review.
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Can you provide a screenshot, please? For the L2 norm I see a square root sign: