The wonderful use of the combination of `flex: 1; width: 0;` in Flex layout: Why can the first child element be displayed normally after the second child element is set to `width: 0;`?

Flex layout skills: use flex: 1; width: 0; solve the problem of child elements squeezing

Flex layout is widely used in web layout, but sometimes it encounters the problem of child elements squeezing each other. This article will explore in-depth the use of flex: 1; width: 0; combination and how to avoid the situation where sub-elements in the Flex container are squeezed.

The following code snippet shows a common problem: a Flex container contains two child elements, the first child element sets a fixed width, and the second child element takes up the remaining space, resulting in the first child element being nearly invisible.

<div style="width: 350px; display: flex;">
    <div style="width: 50px; height: 50px; background-color: blanchedalmond;"></div>
    <div style="flex: 1; width: 0; white-space: nowrap;">
        <div>css3 flex layout, text exceeds .css3 flex layout, text exceeds .css3 flex layout, text exceeds .css3 flex layout, text exceeds .</div>
    </div>
</div>

Why can the first child element be displayed normally after adding width: 0; to the second child element? The key lies in the space allocation mechanism of Flex layout.

When display: flex , the child element becomes the Flex project. The Flex layout allocates space according to project properties. By default, the items min-width and min-height are auto . If width is set for only one project, and the other project width is not specified, the items with width set may be compressed. This is why the first element in the above code is squeezed.

However, when the second project sets width: 0; and flex: 1; at the same time, the situation changes. The Flex layout calculates the width of all items. width: auto depends on the element type: block-level elements represent full use of available space, and inline elements represent shrinking to the appropriate size.

A combination of width: 0; and flex: 1; allows the second project to take up no space. flex: 1 allocates remaining space (350px - 50px = 300px) to it. In this way, the first element will not be squeezed.

Although min-width or width: 0; can solve the problem, it is recommended to use flex-shrink: 0; to prevent the first element from being compressed, which is more in line with the design concept of Flex layout.

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