Learn more about this buildin magic rendering tricks

Hi, I came across this magic format [:small.opacity-50 :fire:1 :speech_balloon:100 ]
It omits the ‘keyword’ :small.opacity-50 and renders the brackets slightly transparent.
Is there any other ‘keyword’ like :small.opacity-50 that can do certain buildin magic rendering?
Unfortunately I don’t find a document for this.

This is hiccup code. It’s basically html for clojure.
See here:

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