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[QTI] Cannot publish a channel because of an exercise containing strikethrough formatted text #6138
Description
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Observed behavior
Similarly to #5895 it's not possible to publish the following test channel containing an exercise with a question containing strikethrough formatting of the text: <s>test</>. This issue is not happening on production. No errors in the browser console:
strikethrough.mp4
Expected behavior
Formatted text should not impact the publishing of a channel.
Steps to reproduce the issue
- Sign in to Studio at
unstable - Go to Channel > Channel editor > New exercise
- Create an exercise containing strikethrough formatting of the text
- Attempt to publish the channel
Usage Details
- Studio Unstable
- OS: Windows 11
- Browser: Chrome, Firefox
Activity
pcenov commentedon Sep 16, 2026
@radinamatic @AlexVelezLl
radinamatic commentedon Sep 16, 2026
This is reoccurrence, should have been fixed in #5595
AlexVelezLl commentedon Sep 16, 2026
No, this is a new issue, it's because of the new QTI publish workflow https://learningequality.sentry.io/issues/7735455836/?environment=unstable&project=1252819&query=is%3Aunresolved&referrer=issue-stream.
AlexVelezLl commentedon Sep 16, 2026
This issue is because the QTI 3.0 specs do not allow
<s>or<del>tags, and our QTI bundling workflow bans them at publish time. To still support the strikethrough button, we will use thestyleattribute on a<span>tag instead.styleisn't defined in the QTI 3.0 XSD either, but at least this does not cause any validation errors.For this, we will need to refactor code from https://github.com/learningequality/studio/pull/6073/changes#diff-48a08c8b3283d25275c3a266a3c25dda576f0d131965a2739729f68227bb1eeeR89 to allow converting these tags into
spantags withstyleattributes rather than just stripping them. We'll also need to update the Rich Text Editor in Studio to recognize the properstylerules for active strikethrough and update the toolbar buttons to toggle it.We should do the same for the underline button, since
<u>isn't valid in QTI 3.0 either. And now that we're going in this direction, we can also show the text alignment buttons again.On the Kolibri side, the
styleattribute is currently supported (learningequality/kolibri#14984); however, there is an allowlist that should be updated accordingly. Before merging the PR for this, follow-up issues/PRs should be opened there to update the allowlist.[-]Unstable - Cannot publish a channel because of an exercise containing strikethrough formatted text[/-][+][QTI] Cannot publish a channel because of an exercise containing strikethrough formatted text[/+]