Next week: "Our research suggests that user experience can be further improved with inline advertisement embedding. What this change means for our partners is that, when serving ads, we recommend prerendering them and avoiding use of explicit semantic markup. As per our new recommendations, advertisements should be located within <main> or <article> elements, and contained within an enclosing <div>. Do not place them within <iframe> or <aside> elements."

Zrybew with the protip, I forgot about Reader.