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Table of Contents
Detailed explanation of the purple slash area in the Flex layout
Scene reappears
Misconceptions and truth
In-depth understanding
Home Web Front-end CSS Tutorial Why are the purple slashed areas in the Flex layout mistakenly considered 'overflow space'?

Why are the purple slashed areas in the Flex layout mistakenly considered 'overflow space'?

Apr 05, 2025 pm 05:51 PM
tool flex layout Why

Detailed explanation of the purple slash area in the Flex layout

When using Flex layouts, the purple slashed area that appears in the developer tool is often confusing. It is not a real overflow, but a visual representation of the "remaining space" in the Flex layout. This article will explain its causes.

Scene reappears

Suppose the parent element a contains two child elements, where the second child element has a height greater than the parent element a . In the developer tools, you will see a purple slash area (as shown below).

Why are the purple slashed areas in the Flex layout mistakenly considered Why are the purple slashed areas in the Flex layout mistakenly considered

Misconceptions and truth

The purple slash area is not a visual overflow, but a representation of the "remaining space" in the Flex layout. The "negative free space" mentioned in the MDN documentation explains this phenomenon. When the child element height exceeds the parent element, the "remaining space" can be negative, which causes it to look visually like an overflow.

In-depth understanding

"Remaining Space" is not always a positive value, it can be a negative value. So even if it looks visually like an overflow, this area is still the "remaining space" used in the Flex layout to allocate space. Understanding this is essential for the correct use of Flex layout.

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