That was not supported in 7.0 either. The Text Area has a very limited set of officially supported html constructs. By default HTML sanitation is enabled which means unsupported html constructs will be disabled on text area rendering. You can disable that sanitation though here:
Warning: Do this at your own risk since this is not necessarily recommended for security purposes and TIBCO cannot garruantee that any unsupported code will continue to work or will not interfere with other parts of the Spotfire application. Of course, it is often disabled to use more advanced webcoding features...
Please see this great explanation of why HTML sanitation is enabled by default:
Just to remember everyone that you need to restart Spotfire after that to make the change active (at least, that's what I had to do).
oliver.drummond - Dec 28, 2017 - 5:31pm
You can use style tag like that if you disable the HTML sanitation, you just need to be aware of the possibility that the behavior might change in future versions. Becuase of that, I have to put that big disclaimer : ) So a style section, in-line styling, JS styling can all be used*
Sean Riley - Nov 29, 2016 - 11:02am
Thanks for the reply Sean! What would you recommend to do when trying to achieve the same output? In-line styling?