Is it possible to add html tags like "strong" or "span" to content title inside sections?

I would like to style single words of title elements but every time I add additional html tags they become encoded and do not work as expected. Or is it able to disable the encoding of html elements in general?

Kind regards,
Michael

I would like to put something like this into the title:

This is my <span>headline</span>

to style the word inside the span tag. Or to add some fontawesome icons with this:

<span class="iconContent"><i class="fa fa-check fa-2x"></i>Additional content with prefixed icon</span>

I suspected it was the security settings, but was hoping I could turn that off somewhere or enable some specific tags as even in the content field only tags are allowed which are enabled through the rich text editor.

Javascript isn't a solution as it might work only somewhat delayed.