fix: Unbreak HTMLized table of contents

[larseggert]

Fixes #5483

[codecov]

Codecov Report

Merging #5486 (e69c9b9) into main (84c1fa1) will increase coverage by 0.00%.
The diff coverage is n/a.

@@           Coverage Diff           @@
##             main    #5486   +/-   ##
=======================================
  Coverage   88.80%   88.81%           
=======================================
  Files         285      285           
  Lines       39611    39611           
=======================================
+ Hits        35177    35180    +3     
+ Misses       4434     4431    -3     

see 4 files with indirect coverage changes

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[rjsparks]

@NGPixel How can we get tests around this?

[larseggert]

At some point I added code so that CI fails when there are unexpected messages in the JS console - but that doesn't seem to trigger anymore?

[NGPixel]

We could add a simple Playwright test on an internet draft we choose. But if the bug only occurred on recent drafts rather than all of them, it might not be helpful at catching future bugs.