What Does 'flex: 1' Really Do in CSS Flexbox?

Understanding the Significance of "flex: 1"

The flex property, as we are aware, is a concise representation of the flex-grow, flex-shrink, and flex-basis properties. With a default value of 0 1 auto, its definition reads as follows:

flex-grow: 0;
flex-shrink: 1;
flex-basis: auto;

However, it has been observed that "flex: 1" is commonly used in various scenarios. Comprehending its implications requires further examination.

Deciphering "flex: 1"

When "flex: 1" is declared, it translates to the following:

flex-grow : 1;    ➜ The div expands proportionally to the window's size.       
flex-shrink : 1;  ➜ The div shrinks proportionally to the window's size. 
flex-basis : 0;   ➜ The div lacks a predetermined starting value, adapting its size dynamically based on the available screen space. (e.g., if three divs are present within the wrapper, each div will occupy approximately 33% of the available space.)

In summary, "flex: 1" essentially instructs the div to expand and contract in proportion to the surrounding window. Furthermore, it ensures optimal space utilization by adjusting its size dynamically without a predefined starting point. This property has proven particularly useful in responsive web design, where flexibility and adaptability are crucial for providing a seamless user experience across multiple devices.

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