My craziest bug was making text-only changes to an html file I'd edited for months, saving the file, then seeing no changes in the browser. Somehow I'd opened

My craziest bug was making text-only changes to an html file I'd edited for months, saving the file, then seeing no changes in the browser. Somehow I'd opened a second editing window for the file, exactly on top of the first window - and the editor was saving with a slightly different name.