Fix typos

[szepeviktor]

Found some misspellings.

There are some more in the benchmark. You may fix it.

./benchmarks/giant.html:4752:18: `simplfy` -> `simplify`
./benchmarks/giant.html:4756:18: `simplfy` -> `simplify`
./benchmarks/giant.html:4829:116: `simplfy` -> `simplify`
./benchmarks/giant.html:5675:23: `visibile` -> `visible`
./benchmarks/giant.html:5700:23: `visibile` -> `visible`
./benchmarks/giant.html:5794:23: `visibile` -> `visible`
./benchmarks/giant.html:8446:64: `transitionable` -> `transitional`

[ekwoka]

I think transitionable is actually correct here.

The thing is able to be transitioned. Transitional is something that is part of a transition.

The others are good catches

[szepeviktor]

Okay.
That HTML file in untouched in this PR.

[calebporzio]

Thank you!

[szepeviktor]

Glad to contribute.