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The "border-width" CSS Property


This shorthand property sets the thickness of all four sides of the element's border. Lengths may not be negative.

Values for "border-width"
CSS LevelValue
CSS 2.1<border-width>{1,4}, where <border-width> is "thin", "medium", "thick", or a non-negative length
CSS3<line-width>{1,4}, where <line-width> is "thin", "medium", "thick", or a non-negative length

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