Ever since I joined the SE system, when I am editing an answer or a question I can see how it looks before I hit "submit" or accept the edit.
I have found, this morning, that I have to submit the edit (with possible errors in look or content) to find out if it looks as intended.
Did I hit a switch that I am unaware of, or did the SO/SE mega powers make a change? I tried an edit at Christianity.SE and it worked as before in terms of WISIWYG while editing.
Later that same evening: on a different PC, using Chrome rather than IE or Edge, same issue on my answer to this question, but not on this meta question that I am asking. Odd bug.