What are the methods for expressing width value in css?

Methods include pixel value, percentage, em unit, rem unit, vw/vh unit, auto, fit-content, min-content, max-content. Detailed introduction: 1. Pixel value (px): The pixel value is fixed, and its width remains unchanged no matter how the screen resolution changes. For example: width: 300px; 2. Percent (%): The percentage width is relative to the width of the parent element. For example: width: 50%; 3, em unit, etc.

In CSS, the main methods of expressing width values are:

1. Pixel value (px): The pixel value is fixed , its width remains unchanged no matter how the screen resolution changes. For example: width: 300px;
2. Percent (%): The percentage width is relative to the width of the parent element. For example: width: 50%;
3. em unit: This is a relative unit, usually relative to the font size of the current element. For example: width: 2em;
4. rem unit: This unit is relative to the font size of the root element (html). For example: width: 2rem;
5. vw/vh units: These units represent one hundredth of the viewport width/height respectively. For example: width: 50vw;
6. auto: When set to auto, the browser will automatically determine the width of the element. For example: width: auto;
7. fit-content: This value will automatically adjust the width of the element based on the content, but will not exceed the width of its parent element. For example: width: fit-content;
8. min-content: This value will automatically adjust the width of the element based on the minimum size of the content. For example: width: min-content;
9. max-content: This value will automatically adjust the width of the element based on the maximum size of the content. For example: width: max-content;

These units can be selected and used according to your needs, but please note that different units may have different effects in different scenarios.

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