Currently only the ThornGuideHTML output uses utf-8 encoding in HTML output files, while the others use latin1.

The pull request

https://bitbucket.org/cactuscode/cactus/pull-requests/68/use-utf-8-encoding-for-all-html-output/diff

uses the same htlatex options for all HTML output and also checks for some htlatex warnings / errors.

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Ticket URL: https://bitbucket.org/einsteintoolkit/tickets/issues/2302/use-utf-8-encoding-for-all-html-output