WebRectangle.BackgroundColor
From Xojo Documentation
Property (As Color )
aWebRectangle.BackgroundColor = newColorValue
or
ColorValue = aWebRectangle.BackgroundColor
New in 2020r1
Supported for all project types and targets.
or
ColorValue = aWebRectangle.BackgroundColor
New in 2020r1
Supported for all project types and targets.
If HasBackgroundColor is True, this color defines the color of the rectangle's background. If False, the color is white.