css/css-layout-api/box-tree-unregistered.https.html

<!DOCTYPE html>
<link rel="help" href="https://drafts.css-houdini.org/css-layout-api/#layout-api-box-tree">
<link rel="match" href="box-tree-unregistered-ref.html">
<meta name="assert" content="This test checks that an unregistered layout() works the same as a normal flow-root." />
<style>
@supports (display: layout(unregistered)) {
  .test {
    display: layout(unregistered);
  }
}

.container {
  margin: 20px 0;
  border: solid 2px;
  width: 100px;
}

.float {
  float: left;
  width: 100%;
  height: 40px;
  background: hotpink;
}

.inflow {
  height: 40px;
  background: hotpink;
}
</style>

<div class="container">
  <!-- This tests that the "layout()" margins don't collapse with its children. -->
  <div class="test" style="margin: 20px 0">
    <div class="inflow" style="margin: 20px 0"></div>
  </div>
</div>

<div class="container">
  <!-- This tests that the "layout()" grows to fit child floats. -->
  <div class="test">
    <div class="float" style="margin: 40px 0"></div>
  </div>
</div>

<div class="container">
  <!-- This tests that a float does not intrude into "layout()" box. -->
  <div class="float"></div>
  <div class="test" style="width: 100%; height: 40px; background: green;"></div>
</div>