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This article mainly explains "the explanation and example usage of padding in css". The content of the explanation in the article is simple and clear, and it is easy to learn and understand. Please follow the editor's train of thought to study and learn "the explanation and example usage of padding in css".

Description

1. For an element with uncertain width and height, but if you want to display it in a certain proportion, you can use padding to calculate the height.

2. Through the width attribute of the parent element, padding can set the percentage to determine the height dynamically.

Example

.parent {/ * parent element width * / width: 600px; position:relative;} .child {width:100%; padding-top:75%;}

The height attribute is not set for the child element, but the padding-top attribute is given 75%, which is calculated based on the width of the parent element parent, height=600px*75%=450px. And the percentages of width and height are 100% and 75%, which meet our 4:3 requirement.

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