1. There's position: sticky; recently added to CSS: https://drafts.csswg.org/css-position/#sticky-pos
2. Position: sticky; is gaining browser support fast: http://caniuse.com/#feat=css-sticky
So what I draw from that are the following insights:
3. The author of the bookmarklet should update the code to also check for elements now using position: sticky;
4. Sticky elements haven't peaked on the web, the deluge is _about_ to begin actually. Brace yourselves…