Thanks! I changed some phrases and rearranged them a little bit, please see https://javascript.info/css-animations#performance, PR if something should be fixed =)

Thanks. I want to point out that I have once seen a sentence here that mentioned that paint is often the slowest step, not layout.

Better now?

Nice job, doc
👍

layout vs paint
I guess it depends on cpu/gpu/screen hardware

Hi Ilya,
is 440 grammar ok? sounds odd
I would also write "mozilla gecko" or just "firefox" so it doesnt sound like a stowaway

@joaquinelio what's wrong? Is 440 a line number?

oops sorry
Not sure
your Engl is better thn mine
no problems in translating it, anyway

440 The opacity property also never causes Layout (also skips Paint in Gecko). We can...

my bad. "also never" seems correct.
apologies

but the 2nd silly suggestion may stand...

@joaquinelio Changed to Mozilla Firefox.

Yes 440 is a line number. It is now 442.

The opacity property also never causes Layout (also skips Paint in Mozilla Gecko). We can...

Yes I agree it sounds weird to say somethings "causes Layout". It'd be better to say it "triggers Layout", even better if we say it "triggers the Layout step".

Line 438 also uses "cause" which could be changed to "trigger".

I originally used 1 and 1 2 and 1 2 3 when talking about these triggers, which was good too. It more clearly makes readers understand that these steps are sequential - if you trigger 1, then 2 3 will trigger too.

@ZYinMD changed to trigger.

Uhm...
@iliakan
you added a redundant line 46 (link to bezier is in line 40 too)

sounds to me
"...you might want to check the previous article you just read in this very same chapter :)

I would combine it with line 40, or place it before 40 below the heading.

removed the extra phrase.