While it is true that this is dead simple to implement (and probably exists elsewhere. I know there are plenty of side-by-side editors that require you to push a button. I bet one realized they could eliminate that.), it's still very useful for people learning HTML, wanting to try some obscure thing with HTML super-fast, etc.
Easy to implement != useless or boring. Look at Twitter.
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While it is true that this is dead simple to implement (and probably exists elsewhere. I know there are plenty of side-by-side editors that require you to push a button. I bet one realized they could eliminate that.), it's still very useful for people learning HTML, wanting to try some obscure thing with HTML super-fast, etc.
Easy to implement != useless or boring. Look at Twitter.
No doubt; I'm just surprised that something this common made the front page, even if putting "instant" in front of things is all the rage.