I think the important thing to keep in mind is HOW Google ensures that their understanding of Javascript helps them improve the Search Experience. If they craw

I think the important thing to keep in mind is HOW Google ensures that their understanding of Javascript helps them improve the Search Experience. If they crawl your page with javascript enabled, and find that after a hover event a button appears and after a click on that button a modal appears, and that modal has content about BLUE WIDGETS, they are still NEVER going to rank that URL for "BLUE WIDGETS" Google wants to send users searching for "BLUE WIDGETS" to a page where content about "BLUE WIDGETS" is instantly visible and apparent.