On: CSS is powerful, you can do a lot of things without JS

[timdavila]

Using HTML5 tags such as <details>, you don't need CSS or JS!

Try this in Chrome: https://jsfiddle.net/timdavila/f5rcarmn/

[cstejerean → timdavila]

Unfortunately this is not yet supported in any version of IE, including Edge.

[irrational → timdavila]

So I didn't try it in Chrome, and it doesn't work in Firefox, yet. But I can see where this is going and it would be awesome if it actually worked.

[qubitcoder → irrational]

On an encouraging note, it does work in Firefox Nightly (50.0a1).

[enraged_camel → timdavila]

Whoa. I learn something new everyday...

[rhgb → timdavila]

It's defined in HTML 5.1, which is still Candidate Recommendation.