Can you explain the meaning of "0 0" in the CSS property "flex: 0 0 33%"?

Exploring the world of flex, I came across this interesting line within Bootstrap 4's column classes:

.col-md-4 {
    flex: 0 0 33.3333%;
}

I am curious about the properties associated with the values 0 0. Could you please shed some light on it?

Answer №1

According to information provided by MDN:

flex

This serves as a shorthand property incorporating flex-grow, flex-shrink, and flex-basis.

These values can be thought of as proportional indicators for the growth or shrinking behavior of an element. For instance, 0 0 33% essentially means "occupy one-third space" without further expansion or contraction relative to other elements.

Delving deeper:

flex-grow

The flex-grow CSS attribute denotes the extent to which a flex item should grow within a flex container. The specified value determines how much space the item should claim inside the container in relation to its siblings.

flex-shrink

The flex-shrink CSS characteristic indicates the degree to which a flex item can shrink to fit into the parent container, based on the assigned value compared to other items when original widths exceed those of the container.

flex-basis

The flex-basis CSS feature defines the initial main size of a flex item, determining its content-box dimensions unless overridden with box-sizing specifications.

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