The forthcoming Chrome UI change to having the address bar at the bottom makes this even worse.
Scrolling down a page auto hides the address bar, it disappears off the bottom of the screen. Scrolling up the page makes it reappear.
The composer opening triggers the address bar to appear. No amount of scrolling down the page makes the address bar disappear while the composer is open.
This may be something to ignore, since it’s Canary…
Edit: for reference, this behaviour is identical in Chrome Beta 63, with the address bar bottom aligned, as well. However, scrolling down the page in Chrome “Stable/Release” 61, with the composer open, auto hides the top-aligned address bar.
Also, is it a bug or a feature that I can scroll the page behind the composer while swapping vertically on the composer text box itself?