What Does `flex: 1` Actually Do in CSS?

Understanding flex: 1

In the realm of CSS, the flex property plays a crucial role in controlling the layout and distribution of elements within a flex container. By default, it assumes the value 0 1 auto, assigning values to flex-grow, flex-shrink, and flex-basis respectively.

However, a common usage arises where flex: 1 is employed. This shorthand designation raises questions about its true intention.

Decoding flex: 1

The confusion stems from multiple interpretations of flex: 1. Some assume it signifies 1 1 auto, while others speculate 1 0 auto as its equivalent.

However, neither assumption is correct. flex: 1 in fact represents the following:

• flex-grow: 1: The element will expand in proportion to the available space within the flex container. As the container grows, so will the element.
• flex-shrink: 1: The element will contract proportionally in response to the shrinkage of the container. If space becomes scarce, the element will shrink to accommodate other elements within the container.
• flex-basis: 0: The element lacks a specified starting size and will take up space dynamically based on the available screen or window size. It will adjust its dimensions as the container or viewport is resized.

In essence, flex: 1 ensures that the element occupies space equally with other elements in the flex container, allowing both growth and shrinkage to maintain a balanced distribution. This flex behavior is commonly used for responsive designs where elements need to adapt to different screen sizes, ensuring a harmonious layout for various device resolutions.

The above is the detailed content of What Does `flex: 1` Actually Do in CSS?. For more information, please follow other related articles on the PHP Chinese website!