Thickness

One, two, or three doubles that define the area around a rectangle.

Examples:

• 12.5 (12.5 on all sides)
• 5, 10 (5 on left and right sides, 10 on top and bottom)
• 3, 4, 5, 6 (3 on left, 4 on top, 5 on right, 6 on bottom)

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