I need this textfield to be like the wysiwyf editor of phpbb (when you post a new topic for example).
phpBB does not have a WYSIWYG editor so you will need to explain exactly what it is that you are trying to do.
David Remember: You only know what you know and - you don't know what you don't know! My CDB Contributions | How to install an extension I will not be accepting translations for any of my extensions in Github - please post any translations in the appropriate topic. No support requests via PM or email as they will be ignored
Is this even regarding extension developing?
And line breaks are rendered in phpBB, by the textformatter.
And a double line break closes the previous paragraph (<p>) and opens a new one.
If you want additional spacing, just add a custom BBCode that will do just that?