What is the programing language I'm editing in when make an HTML5 Canvas file in Animate?

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What is the programing language I'm editing in when make an HTML5 Canvas file in Animate?

Is this ActionScript 3.0 or something else?

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The entire point of HTML5 Canvas documents, unlike SWFs, is that they don't rely on a browser plugin. That means they can only do what browsers themselves can natively do. So that means they use the only language browsers can use: JavaScript.

https://helpx.adobe.com/animate/kb/as-to-html5.html