I added correct syntax highlight for -ms-viewport and -o-viewport.

[george-tr6]

I added correct syntax highlight for -ms-viewport and -o-viewport.

Originally posted by @octref in #54515 (comment)

[george-tr6]

I see the same issue after the latest update Version: 1.55.0.
Previous issue related to this bug was #54515

[alexr00]

We recently moved to a different CSS grammar for providing syntax highlighting. The old one was unmaintained, and the new one has good fixes in it. You can see the full discussion here: #115480

Specifically, see #115480 (comment), which references viewport as a deprecated feature (details https://developer.mozilla.org/en-US/docs/Web/CSS/@viewport). Even though the new grammar is missing ms-viewport, we decided to go with it because the benefits of having a maintained grammar outweighed the negative of missing the deprecated ms-viewport.

If you feel strongly that this is essential for the grammar, I recommend going to https:/atom/language-css/, the repo that we pull our css grammar from, and filing an issue there to ask for ms-viewport to be supported in their textmate grammar.

[george-tr6]

Thank you for the detailed explanation Alex!
I was using this feature for emails and as we know the email coding is kind of stuck in the past :)
I will work on retiring this deprecated feature in my code as it seems that it is not essential anymore.

Thanks again and have a great day!