RTE: Custom CSS properties

[leekelleher]

📋 Description

Adds a page to outline the custom CSS properties that can be used to customize the appearance of the Rich Text Editor.

📎 Related Issues (if applicable)

• Tiptap RTE: Custom CSS Variables for min/max height/width Umbraco-CMS#19841 (comment)

✅ Contributor Checklist

I've followed the Umbraco Documentation Style Guide and can confirm that:

• Code blocks are correctly formatted.
• Sentences are short and clear (preferably under 25 words).
• Passive voice and first-person language (“we”, “I”) are avoided.
• Relevant pages are linked.
• All links work and point to the correct resources.
• Screenshots or diagrams are included if useful.
• Any code examples or instructions have been tested.
• Typos, broken links, and broken images are fixed.

Product & Version (if relevant)

Umbraco CMS v16.2.0

Deadline (if relevant)

Anytime before the v16.2.0 release (4th Sept 2025).

📚 Helpful Resources

• 🧾 Umbraco Contribution Guidelines
• ✍️ Umbraco Documentation Style Guide

[leekelleher]

I'm getting a Vale error [UmbracoDocs.Names] Use ''JavaScript'' instead of 'JavaScript' for consistency, which I don't understand, as I've used the correct casing for "JavaScript". 🤔

[sofietoft]

We've updated some of the vale checks today, so might be some issue related to that. We'll check up on it 🙏

Also, could you add the new article to the SUMMARY file? 😇

[leekelleher]

Also, could you add the new article to the SUMMARY file? 😇

@sofietoft I'd totally forgotten about that file. 🤦 I've updated it now. 👍