Fix #9122

[alchzh]

alternatively it could just tell you to the whole tag with

<button className="square" onClick={() => alert('click')}>
  {/* TODO */}
</button>

or something like that

[alchzh]

Of note, the tutorial probably needs an overhaul

[gaearon]

Thanks! There are other PRs addressing this in more detail so going to use them instead.

[gaearon]

@brigand and I rewrote some parts of the tutorial in #9454, and following along should be easier now. Let us know if you're still struggling! We’re happy to look at remaining issues in case we missed anything.

https://facebook.github.io/react/tutorial/tutorial.html

[alchzh]

Good work 👍