testing/web-platform/tests/css/CSS2/floats/floats-wrap-bfc-with-margin-010.html


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<!DOCTYPE html>
<title>CSS Test: Float followed by a BFC root with a negative margin-top</title>
<link rel="author" title="Oriol Brufau" href="obrufau@igalia.com">
<link rel="help" href="https://drafts.csswg.org/css2/#floats">
<link rel="match" href="floats-wrap-bfc-with-margin-010-ref.html">
<meta name="assert" content="
  If the negative margin places the BFC root entirely above the float,
  then they don't overlap so we are done.
  If the negative margin is not enough to prevent them from overlapping,
  then the BFC root needs to be placed adjacent to the float if there
  is enough available space, or be cleared below the float.">
<style>
.wrapper {
  float: left;
  width: 100px;
  border: 5px solid;
  margin: 75px 10px;
}
.float {
  float: left;
  width: 50px;
  height: 50px;
  background: cyan;
}
.bfc {
  overflow: hidden;
  height: 50px;
  background: green;
}
</style>
<div class="wrapper">
  <div class="float"></div>
  <div class="bfc" style="margin-top: -75px; width: 50px"></div>
</div>
<div class="wrapper">
  <div class="float"></div>
  <div class="bfc" style="margin-top: -75px; width: 75px"></div>
</div>
<div class="wrapper">
  <div class="float"></div>
  <div class="bfc" style="margin-top: -25px; width: 50px"></div>
</div>
<div class="wrapper">
  <div class="float"></div>
  <div class="bfc" style="margin-top: -25px; width: 75px"></div>
</div>