This is Jetbrain's "language injection" feature if you want to look it up. It works with any languages that the IDE supports, and like a sibling comment mention

This is Jetbrain's "language injection" feature if you want to look it up. It works with any languages that the IDE supports, and like a sibling comment mentioned it does more than syntax highlighting. https://www.jetbrains.com/help/idea/using-language-injections.html https://www.jetbrains.com/help/idea/using-language-injection...