A bit of pedantry: it's actually very old, as the article mentions, even being removed from the spec at one point [1] and then being added back in. https://git

A bit of pedantry: it's actually very old, as the article mentions, even being removed from the spec at one point [1] and then being added back in. https://github.com/whatwg/html/commit/5ddfc78b1f82e86cc202d72ccc752a0e15f1e4ad https://github.com/whatwg/html/commit/5ddfc78b1f82e86cc202d7...