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What is box element?
In CSS, the term "box model" is used when talking about design and layout. The CSS box model is essentially a box that wraps around every HTML element. It consists of: margins, borders, padding, and the actual content.
How do you calculate content box?
The content box can't be negative and is floored to 0, making it impossible to use border-box to make the element disappear. Here the dimensions of the element are calculated as: width = border + padding + width of the content, and height = border + padding + height of the content.
What is box-sizing in HTML?
The box-sizing property allows us to include the padding and border in an element's total width and height. If you set box-sizing: border-box; on an element, padding and border are included in the width and height: Both divs are the same size now!
