CKEditor5 Sup Fix

Following lessons learned developing CKEditor5 Table Fix.

A lightweight plugin that restores HTML <sup> markup support (like for example:

<sup id="fn1-1-rf"><a class="fn-lnk" href="#fn1"><span class="wb-inv">Footnote </span>1</a></sup>

<a class="fn-lnk" href="#fn1"><span class="wb-inv"><sup id="fn1-1-rf">Footnote </sup></span><sup id="fn1-1-rf">1</sup></a>

ckeditor5_sup_fix is especially useful after upgrading from CKEditor4.

<sup id="fn1-1-rf"><a class="fn-lnk" href="#fn1"><span class="wb-inv">Footnote </span>1</a></sup>

Provides a faux CKEditor button for easy enablement (just drag the dummy icon down to the editor bar and then save configuration)
Works with Drupal 10/11 and any text format using CKEditor5
Designed for upgraded sites coming from CKEditor4 that need legacy sup markup preserved

Use cases:

Enable the CKEditor5 Sup Fix plugin on the same text format. Look for the “Sup Fix Dummy” button and add it to the toolbar.
Save your text format — the plugin is now active.

No visible button will appear in the CKEditor UI, but the plugin will be loaded silently in the background to preserve your full <sup> markup.

None. This module only requires Drupal core CKEditor 5 support and does not depend on contrib modules.

CKEditor 5 Sup Fix