My thought when reading that in the article was (in cases where, as you said, irregular-shaped clickable areas are not a concern): why do we need pixel-based po

My thought when reading that in the article was (in cases where, as you said, irregular-shaped clickable areas are not a concern): why do we need pixel-based positioning? What's wrong with percentage-based positioning and sizing? I did exactly that a couple of years ago, and it worked as expected.