Why Does Percentage Padding on Flex Items Cause Layout Issues?

Why Padding Percentage Disturbs Flex Item

Your conundrum with the

elements breaking the

into multiple lines when percentage paddings are applied stems from the way padding is calculated. Percentage padding is determined relative to the width of the containing block, which in this case is the
.

Before the percentage of padding can be calculated, the width of the

must first be established. By using percentage padding without setting a fixed width for the
, you are essentially asking the browser to guess its width based on its content.

As the calculated width of the

depends on its content, applying percentage padding introduces a dependency loop. The browser first tries to calculate the width of the
• elements with the percentage padding, which influences the width of the
  . This width is then used to calculate the padding for the
  • elements, which again affects the width of the
    .

    This iterative process continues until the width is finally resolved, but it can result in unexpected behavior like the multiple-line layout you witnessed when you applied percentage padding. As an alternative, using fixed paddings eliminates this circular calculation and ensures a stable layout.

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