Nat Torkington @O'Reilly Radar breaks it down nicely:

The point of the standards is not just to ensure that browsers can
display the pages. The standards also ensure the pages form a platform
that can be built upon; a hacked-together platform leads to brittle and
fragile extensions.

More on web standards.

Written by

Fred Simmons

As a Managing Partner and the Director of User Experience at Gulo, Fred enjoys making website interactions more natural and improving UX design. Outside of work, Fred enjoys golf, BBQ, craft beer, movies where the bad guy wins, comma-separated lists, and talking about himself in the third person.