I have tried to put a section label as HTML.
Here is the config of section:
When I apply changes, this what appears on builder.
And then when I execute it on runner this is the result:
It is scaping HTML and by that is being treated as plain text.
I am using Orbeon 2018.1.2.201810050007 PE.
Maybe I am not taking in account something or missing any configuration.
This issue is fixed in Orbeon Forms 2018.2.3 and Orbeon Forms 2019.1. See #3671 for details. There is no backport of this fix to the Orbeon Forms 2018.1 series as of yet but if you have commercial support, please contact Orbeon directly about this.