Some day ago I tried out Sublime Text for working with character sheets, and Cassie provide me with a good setup that showed both HTML highlighs as well as javascript highlights.
I ended up tinkering a bit with the setting, and now have a setup that have few minor Roll20-specific highlights that might come in handy for some people
Roll20-specific HTML hightlight for Sublime Text
It highlights i18n-data language attributes and their value, as well as button, rolltemplate and charmancer tags
