Add Superscript and Subscript Support for Trix Editor #210
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- uses Material Design icons for sub and sup for visual consistency. For reference, these are from Material Symbols, weight 500, size 20px, fill color black, and implemented as URL-encoded data objects in CSS. - moves sub and sup buttons to 'text tools' button group - moves JS code to app.js
wunc
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Jan 16, 2026
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This PR adds support for superscript formatting in the Trix editor by applying a community-recommended fix (see basecamp/trix#368) to resolve issue #209.
Additionally, it updates the Purify configuration to use the stevebauman/purify package's definition structure. The previous config followed the underlying HTMLPurifier conventions without including the package's HTML5 definition class, causing
<sub>and<sup>tags to be stripped during sanitization despite being allowed. This update, combined with the Trix editor configuration, ensures subscript and superscript formatting works end-to-end—from editor input to frontend rendering.