In dev10 there is a problem with Box background color and

size

modifiers: backgroundColor not works in below code:

Box(backgroundColor = Color.Blue, modifier = Modifier.width(200.dp).height(100.dp))

works in below one:

Box(backgroundColor = Color.Blue, modifier = Modifier.size(200.dp))

It is a known issue,

width

and

height

have been buggy in dev09 and dev10. Please use

preferredWidth

or

preferredHeight

instead, and switch back to them in dev11 where the bug should be fixed

@Mihai Popa Thank you, can you please explain the difference of width and preferredWidth, the docs of them is not very clear to me.

width

will be respected even when it does not respect the incoming constraints, while

preferredWidth

will be coerced inside the incoming constraints