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Today, Xiaobian will share with you the relevant knowledge points on how to use calc in css3. The content is detailed and the logic is clear. I believe most people still know too much about this knowledge, so share this article for your reference. I hope you will gain something after reading this article. Let's find out together.

In css3, the calc() function is used to dynamically calculate the length value, the parameter can be set to a mathematical expression, and the result will take the return value after the operation; any length value can be calculated using the calc() function, and the standard mathematical operation priority rule is used, the syntax is "length attribute:calc(length mathematical expression)".

Operating environment for this tutorial: Windows 10, CSS3 && HTML5 version, Dell G3 PC.

What is the use of Calc in CSS3?

The calc() function is used to dynamically calculate length values.

Note that a space needs to be reserved before and after the operator, for example: width: calc(100% - 10px);

Any length value can be calculated using the calc() function;

calc() function supports "+", "-", "*", "/" operations;

The calc() function uses standard mathematical precedence rules;

The syntax is:

calc(expression)

expression must be, a mathematical expression whose result will take the return value of the operation.

Examples are as follows:

123 #div1 { position: absolute; left: 50px; width: calc(100% - 100px); border: 1px solid black; background-color: yellow; padding: 5px; text-align: center;}

Create a div that spans the screen with a gap of 50px on either side:

Some texts...

Output:

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