Let me know when browser support the full CSS print spec...no Prince doesn't count.
Again I would be happy with HTML if the major browsers actually implemented full CSS print spec that exists to cover what PDF does with print layout.
> That’s an important feature, just like reflow. But does the former make PDF World’s most important file format?
It's not just that PDFs are displayed the same across devices, it's that it's displayed the same over time. I can open a PDF generated in 1995 and it will look identical today as it did then. The same can't be said about HTML or Word documents generated in 1995.