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The UDim data type represents the position and size of a GUI element within one dimension. UDim is composed of a relative scale (as per parent) and an absolute offset (as per unit). UDim is constructed from two number values. Two UDim values are used to construct a UDim2 value.

Scale is a number between 0.0 and 1.0 that is a percentage of the parent object's size. For example, if the parent object is 50 pixels wide, a UDim scale of 0.5 would be 25 pixels wide. 0.5 makes the size cover 50% of its parent, same as 0.38 is going to cover 38%, 0.85 is going to cover 85%, and so on.

Offset is a specified integer. This is a non changing value that is factored into the UDim calculation.

The final result is a combination of Scale and Offset: Scale * Parent.AbsoluteSize + Offset.

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