You also might be able to add the tags and their possible attributes that you want to use in the assets/components/tinymce/xconfig.js fileAs I mentioned previously in this thread - the xconfig.js file has html5 tags (at least some of them) in it as valid but MODX's tinymce implementation seems to ignore this. So the answer lies else where!
You also might be able to add the tags and their possible attributes that you want to use in the assets/components/tinymce/xconfig.js fileAs I mentioned previously in this thread - the xconfig.js file has html5 tags (at least some of them) in it as valid but MODX's tinymce implementation seems to ignore this. So the answer lies else where!