Why is the element width inconsistent after setting position: absolute;? How to solve this problem?

Detailed explanation of the problem of inconsistency between CSS absolute positioning and element width

When using CSS for web page layout, position: absolute; attribute will have an unexpected impact on the width of the element, especially when used in conjunction with percentage width. This article will explain this phenomenon and provide solutions.

Problem description: When an element is set to position: absolute; its width becomes inconsistent; and after removing this property, the width returns to the same. The user's computer display configuration is 1.25 physical pixels equal to 1 logical pixel, and the browser zoom is 100%.

Problem Analysis: This problem is related to the context of absolute positioning and percentage width calculations. position: absolute; Removes the element from the document stream, and its width calculation depends on its containing block.

If the parent element does not have position: relative; or other positioning attributes set, the containing block of the absolute positioning element will be the most recent positioned ancestor element, and if not, the initial containing block (usually the viewport). When using percentage width, percentage is calculated based on the inclusion block width. Browser scaling or other factors may affect the width of the contained block, resulting in inconsistent widths of the absolute positioning elements.

Solution:

1. Add position: relative; : to the parent element , which specifies the inclusion block of absolutely positioned elements, making its width calculation more stable and predictable.

2. Use fixed pixel (px) width : Avoid using percentage widths, directly use pixel values ​​to define element widths, eliminate the impact of included block width changes, and ensure width consistency.

Through the above methods, the inconsistency of element width caused by position: absolute; combined with percentage width can be effectively solved to ensure the stability and consistency of web page layout.

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