Why do two adjacent child elements in the same Flex container show different styles?

Analysis of style differences between CSS Flex container subelements

In CSS Flex layout, we sometimes observe that the styles of adjacent child elements in the same Flex container are inconsistent. For example, a child element shows a purple twill, while adjacent child elements do not. This article will explore the possible reasons for this phenomenon.

Suppose there are two child elements A and B in the Flex container, and child element A shows a purple twill, and child element B does not. This is not a problem with the Flex layout itself, but is caused by differences in the application of CSS styles. The following situations may cause this difference:

1. Background style difference: Sub-element A may set the background image, background color, or background gradient, while sub-element B does not. Purple twill may be part of the background pattern. For example, element A may use linear gradient: background-image: linear-gradient(45deg, purple, transparent);

2. Border style differences: Sub-element A may have a border with purple twill, such as using a border image or a special border style. Sub-element B does not have such border settings.

3. Pseudo-element or pseudo-class: child element A may use ::before or ::after pseudo-element and set a style to produce purple twill. Child element B does not use pseudo-elements or uses a different pseudo-element style.

4. CSS selector priority: There may be CSS rules, whose selectors more accurately match child element A, thus overwriting more general style rules. This resulted in only element A to apply purple twill style.

5. Inheritance and Cascade: The style of the parent or ancestor element may affect the display of the child element. It is necessary to check whether the styles of the parent and ancestor elements have different effects on children A and B.

In order to find the exact reason, it is necessary to check the CSS code of the child elements A and B, as well as the CSS code of their parent elements. If the CSS of child element A contains any of the above styles and child element B does not, this style difference can be explained. For example, if child element A uses a linear gradient background and child element B does not, the purple twill is caused by the gradient background.

By carefully examining the CSS code and gradually eliminating the above possibilities, you can find the root cause of the differences in the style of the child element. It is recommended to use the browser's developer tools to check the style of elements and view the CSS rules applied to the elements.

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