Body Toggle

I appreciate the clarity of this trick that Mikael Ainalem posted over on Reddit:

It’s a one-liner that toggles the class on the so you can mock up different states and toggle between them on click.

Could be on any element as well!
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This can be a big thing. See “The Power of Changing Classes” as a case in point. Even if you aren’t much of a JavaScript person, classList is perhaps the one API you should know.

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