If you're not a designer, it might be hard to see, but the importance of this work is impossible to overstate. In 10 years, we'll look back on today and think about how barbaric and stupid it was that we didn't have re-flowable text in multi-box CSS layouts or absolute control of typefaces on the web.

I have come upon the edge of what CSS is capable of multiple times, especially when building http://dustincurtis.com, and what happened surprised me: after a while, I noticed that I had started to subconsciously alter my designs to fit within the limitations of the display technology. As I realized that the only sane way to build the layouts was to absolutely/manually position every paragraph, I slowly stopped writing and designing the articles. It was just too much work because the tools to do great custom layouts on the web just don't exist.

Compared to what should be possible by now, CSS is pretty primitive. It's a limiting factor in the digitization of traditional media, like magazines. What Adobe is doing here is awesome, and I commend them for pushing forward the status quo.