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flex-basis refers to width/height?

andi1984 profile image Andreas Sander Originally published at andi1984.dev ・1 min read

This week I realized again something about flexbox and flex-basis in particular which I tend to forget while working on
other CSS styles.

It is about the flex-basis property:

An absolute <length>, a <percentage> of the parent flex container's main size property, or the keyword auto.

What is referred here as "main size" is the size along the main axis of the flexbox.

Thus, this means flex-basis refers to:

  • width in case of flex-direction: row
  • height in case of flex-direction: column

My misconception here was that flex-basis ALWAYS refers to the width.

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