I love this deep dive that Sara takes into the question of marking up content for progressive disclosure. It reminds me Dan’s SimpleQuiz from back in the day.
Then there’s this gem, which I think is a terrificly succinct explanation of the importance of meaningful markup:
It’s always necessary, in my opinion, to consider what content would render and look like in foreign environments, or in environments that are not controlled by our own styles and scripts. Writing semantic HTML is the first step in achieving truly resilient Web sites and applications.