Prevent CKEditor5 from filtering out classes

[jayhlee]

Description

CKEditor5 filters out any classes applied to HTML elements in the Source Mode. I created an HTML Purifier config to prevent this, but the classes still get stripped out upon saving an entry.

{
   "HTML.Allowed": "ol[class],li"
}

Specifically, I'm trying to allow different classes to be applied to <ul> elements (e.g. class1, class2) without CKEditor5 stripping them out.

Additional info

• Craft version: 4.5.3
• PHP version: 8.0.13
• Database driver & version: MariaDB 10.5.22
• Plugins & versions: CKEditor 3.5.1

[brandonkelly]

CKEditor itself is probably the one stripping the classes. The only way CKEditor will allow classes to be added to ol/ul/li elements is via the Styles feature.

Note that to style lists, you will need to ensure your CKEditor config’s “List Plugin” setting is set to DocumentList.