JSX has some questionable design limitations in it, though. Like, these work as expected: \<h1>Hello, world!\</h1> \<img alt="Hello, world!"/> \<h1>Hello

JSX has some questionable design limitations in it, though. Like, these work as expected: \<h1>Hello, world!\</h1> \<img alt="Hello, world!"/> \<h1>Hello, {place}!\</h1> \<img alt={message}/> But this doesn't: \<img alt="Hello, {place}!"/> And as other commenters note, it's designed around React internals, meaning you get rules around capitalisation that wouldn't otherwise exist. And so on.