...which leads to two buttons which say "Submit query" in the top right of my screen while noVNC is loading. The images for these buttons (clipboard and disconnect, fwiw) are later fetched and displayed. This issue is aggravated by the slow Solaris server which makes loading times much longer, but it's not hard to imagine real-world cases where you'd have a slow connection.
Created attachment 517 [details] Here's how it looks
fixed upstream: https://github.com/kanaka/noVNC/commit/23817e151651a978648b6320ed9d69e0bc5bb7ff
Fixed in revision 28725.
Build 4304: Buttons no longer say 'submit query', that's good enough for me.