Usability of a mobile navigation consisting mostly of accordions?

I have a fairly simple site map with two levels of pages in several categories:
Landing A
– A1
– A2
– A3
Landing B
– B1
– B2
– B3
etc.
Would having a mobile navigation consisting mainly of accordions (which reveal links t…
Why are the profile pictures rounded nowadays?

Why are many websites and applications using round profile pictures? Even the top players like Google and Apple use round profile pics over conventional rectangle frames. Why?
Why are the profile pictures rounded nowadays?

Why are many websites and applications using round profile pictures? Even the top players like Google and Apple use round profile pics over conventional rectangle frames. Why?
Why do scrollbars revert to original scroll distance when mouse is dragged sideways too far?

When dragging the scrollbar using the mouse, the contents of the scrollpane move up and down as the bar moves with the mouse. But if you keep the mouse button held down, and move the pointer sideways for about 100 pixels (te…
What’s the point of closing windows by double-clicking their top-left?

In Windows, you can double-click the top-left of a window to close it.
But why?
It’s not intuitive. At all.
What sort of advantage is there by using this kind of behaviour for closing windows? I even happened to accidental…