If you were a web browser implementor that had a long standing bug rendering some code never touched by the hip Web Designers of the day, would you expend the energy to fix your browser? Or given a seat on a new standards committee, would you just rewrite the standards so your bug is now a feature?

Welcome to the world of the WhatWG and HTML5. All of those "That's not a bug, it's a feature" jokes on Slashdot from a decade ago about Windows are now being codified for the web by the WhatWG.