[Enhancement]: Javascript preview renderer

[Nanorithm]

Hello! I'm surprised it hasn't been brought up before (at least from my searches) but a feature I would like to see would be a javascript renderer for the code preview function. A lot of snippets I have depend on javascript to display properly so a JS renderer would be perfect.

For example:

MassCode

CodePen

As you can see, it is a night and day difference haha, making the preview feature nearly useless for more modern snippets that expand beyond plain html and css.

I would assume it hasn't been implemented for security reasons but I think it should be possible given things like codepen, JSFiddle, etc are able to execute javascript securely in a sandbox.

[Nanorithm]

I just looked at this again today and javascript rendering is already possible via <script> tags in an html fragment, it only doesn't show if it is in a separate .js fragment in the snippet so really we only need js marked fragments to run inside of a <script> tag when previewing the code.