Please don't make me create a new account on yet another service just to post a comment, specially if they're moderated beforehand.

Your tip is so wrong. These shortcuts work (both JKL and the arrows/spacebar) both on a Mac and on Youtube HTML5 videos, you might have to click on the video first for it to recognize the keystrokes are meant for it, but the point is they work.

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Albuquerque!

See, I can do it too!

National Treasure.

The problem is not this does or does not work on the mac, it's focus. The video has to be the focus on the webpage for most keyboard shortcuts to work. Spacebar works on the mac, as do the arrow keys. In fact, youtube has a whole tab-controlled system to move around the controls hands-free in a video - just google 'youtube keyboard controls' for things like the 1-9 number keys insta-jumping to the 10%-90% point in the video.

Right. Focus is the "key" here. BTW idontwanttoregis, the Kirk tip is not "so wrong" (those shortcuts works on a Flash video on a Mac), it is just a bit "incomplete".

Click or not, it doesn't work for me with HTML5 videos. So what could be different between my Safari and your browser?

Even though it doesn't work for you, it is documented in several several places. Stating the spacebar and arrow keys don't work on youtube on mac is flat out wrong. Although one could be less acetic in tone when pointing it out, this hint, as written, is wrong. I even switched to the HTML5 viewer - same expected behaviour - click on video, it pauses. Now, spacebar and arrow keys work. Google acknowledges the HTML5 player has issues in full screen - space and arrow keys worked, extended control keys ( 1-9 to go to percent, 0 to beginning) do not work.

This is similar to iTunes, where I had to explain frequently that the spacebar would not pause and play if the focus in iTunes is changed. You can tab around the iTunes interface also, making spacebar something other than play/pause.

Perhaps it's something less-than-obvious, like full keyboard access in SP->Keyboard, but I'm not interested enough to troubleshoot myself in the foot.

Once in awhile you get shown the light
In the strangest of places, if you look at it right.

These keyboard shortcuts also work for QuickTime 7 (which I use in preference to QuickTime 10, because of the separate control bar).