[taeric]

I feel like you are ultimately reinforcing the point? PX, especially in CSS, does not refer to a single device pixel. As such, it is just a smaller unit of measure, within all of the other units that are supported.

I grant that it is different from REM, in that it is not dependent on the root font-size. That said, I hesitate to see how that is a bad thing. Seems being stable between font changes is a good thing for most measurements on the page? I suppose it is a perspective of trying to make sure a set number of textual items fit in a space, or of keeping all of the boxes on the page the same size? I could see both being valid.

Edit: to be fair, my point on box sizes is made in the article.