@fengwang Cool. Once upon a time I was a teacher in a former life and old habits like sharing knowledge die hard. Had to take coursework on "readability" decades before "UX" was a thing. Of course it is obvious once Baris replied. Duh... On related note: You mentioned images. In event you are unawares, clicking on an image then opens that image for larger display (maybe even in a new tab depending on config, I forget the default just now). Most modern browsers auto zoom to adjust for full browser screen geometry. Clicking on that image yet again should result in full scale, e.g. 5k by 4K, which you will then need to pan about w/sliders and such.