Analysis of tips instance in CSS

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When the elements margin-top, margin-bottom and padding-top, padding-bottom use percentage units, they are relative to the width width of the parent element, rather than the height height we imagined.

two。 When there is a positioning attribute element, the top and bottom units are the percentage, which is the height height relative to the parent element. Left and right are relative parent element width width.

3. Border width must not be expressed as a percentage.

4.width100%

When there are absolutely positioned child elements in the parent container, the child element setting width:100% actually refers to the width relative to the parent container padding+content.

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