CSS engine: Differences between Data Center and Cloud?

[Steffen Heller]

Hi all,

I would like to know if Data Center and Cloud use different CSS engines and have differences in what CSS properties are supported or not. 

For older versions of Server I once found that the Flying Saucer library was used. With that information I could check what is supported or not.

What is the case now with the latest versions?

If someone wants to get more specific: I am interested in support for "element()".

So far, I am using CSS code that includes this:

@page {
@Top-left {
content: element(runningfooter) element(var_page);
} }

That works with the current Data Center version.
Asking ChatGPT about differences, it vaguely said that "the PDF export engine in the cloud does not reliably support the CSS element() function".
This statement I would like to translate.

[Kristian Klima]

Hi @Steffen Heller 

If you mean CSS options to change the look and feel of Confluence as such, then ... well, Cloud does not have CSS styling options.

Except: https://developer.atlassian.com/platform/forge/extend-ui-with-custom-options/

On Cloud, CSS styling options are only available for PDF exports (which is, I assume, why ChatGPT is giving you answers related to PDF). And judging by questions asked here on community, that feature is not exactly reliable.