File: margin-collapse-with-indefinite-block-size-004.html

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<!DOCTYPE html>
<meta charset="utf-8">
<link rel="author" title="Oriol Brufau" href="obrufau@igalia.com">
<link rel="help" href="https://drafts.csswg.org/css2/#collapsing-margins">
<link rel="help" href="https://drafts.csswg.org/css-sizing-3/#behave-auto">
<link rel="help" href="https://drafts.csswg.org/css-sizing-4/#valdef-width-fit-content">
<link rel="match" href="../reference/ref-filled-green-100px-square.xht">
<meta name="assert" content="
  According to CSS2, the bottom margin of a block container can collapse
  with the bottom margin of its last in-flow child if `height` computes
  to `auto`.

  However, according to CSS Sizing, that was 'legacy spec prose' and
  should be interpreted as 'behaves as `auto`'.

  Therefore, a `fit-content` value in the preferred block size property
  shouldn't prevent margin collapse, because it behaves as `auto`.
">

<p>Test passes if there is a filled green square and <strong>no red</strong>.</p>
<div style="width: 100px; height: fit-content; background: red">
  <div style="height: 100px; margin-bottom: 100px; background: green"></div>
</div>