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The "box-sizing" CSS Property

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ExperimentalNew in CSS3

This property specifies how to apply the width and height of the content box to the element. The value "content-box" (the initial value) is the behavior specified by CSS 2.1, while "border-box" is the common implementation of legacy browsers for replaced elements and input elements.

Values for "box-sizing"
CSS LevelValue
CSS 2.1(invalid)
CSS3"content-box", "padding-box", or "border-box"

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