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How to trigger animate on character length


New member
Hi all,
I am in the midst of making a Twitch alert which has html/css and now seems like it may need javascript.

Currently I have usernames which animate using keyframes, but it does it for every username. I want to limit this to usernames that are more than 300px in width.

While I don't want someone to write that for me, I do want to know what the buzz/key words are I should research to do so.