askvortsov Sligma For security reasons, HTML is generally disabled. Headings and links can be accomplished via markdown or bbcode, you can read more online about both.
clarkwinkelmann The [h1] through [h6] bbcodes are available but not enabled by default. An extension can enable them https://s9etextformatter.readthedocs.io/Plugins/BBCodes/Add_from_the_repository/#h1 Markdown titles are enabled by default however: Title 1 Title 2 Title 3 Title 4 Title 5 Title 6 # Title 1 ## Title 2 ### Title 3 #### Title 4 ##### Title 5 ###### Title 6 or Title 1 Title 2 Title 1 === Title 2 --- Reference https://s9etextformatter.readthedocs.io/Plugins/Litedown/Syntax/#headers
clarkwinkelmann You can see which bbcode tags are enabled by the flarum/bbcode extension here https://github.com/flarum/framework/blob/main/extensions/bbcode/extend.php I think FoF Formatting only enables some other non-bbcode tags. As far as I know, there is currently no extension that enables [h1]/[h2]/etc. [size=] is enabled by the bbcode extension. Usage is described in the TextFormatter documentation https://s9etextformatter.readthedocs.io/Plugins/BBCodes/Add_from_the_repository/#size The value passed is the number of pixels which must be between 8 and 36.
askvortsov Sligma that's not supported. For headings use markdown: https://www.markdownguide.org/basic-syntax/