I am looking for Documentation that lists all the available HTML tags in Vision.
Specifically I am looking for the definitions for these codes:
Ex. ² (this is for subscript 2)
I don't think this is documented anywhere, even in the Java documentation.
Vision's HTML support is really just Java Swing's HTML support. It's poorly documented and seems to be just a small subset something ancient like HTML 3.x.
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Specifically ² is just an HTML entity code; I'll echo Kevin that I don't think this is internally documented anywhere, but you can certainly try any of the codes on this page:
The more modern way to embed arbitrary characters is Unicode; e.g. subscript 2: ₂. Swing supports unicode characters just fine, but your font may or may not; our default embed in Ignition 8 is Noto Sans with basic support for unicode characters, but there are significant gaps, notably the CJK language families and also emoji.