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chromium/third_party/blink/web_tests/external/wpt/css/css-anchor-position/anchor-center-002-ref.html 

<!DOCTYPE html>
<title>Tests that 'anchor-center' behaves as 'center' in non-OOF layout modes</title>

<style>
.container {
  width: 100px;
  height: 100px;
  background: orange;
  margin-block: 5px;
}

.item {
  width: 40px;
  height: 40px;
  background: lime;
}

.flex {
  display: flex;
}

.grid {
  display: grid;
  grid-template-columns: repeat(8, 1fr);
  grid-auto-rows: 50px;
  grid-template-areas:
    "a a a a b b b b"
    "a a a a b b b b";
}
</style>

<div class="flex container" style="align-items: center">
  <div class="item"></div>
</div>

<div class="flex container">
  <div class="item" style="align-self: center"></div>
</div>

<div class="grid container"
     style="align-items: center; justify-items: center">
  <div class="item" style="grid-area: a"></div>
  <div class="item" style="grid-area: b"></div>
</div>

<div class="grid container">
  <div class="item" style="grid-area: a; align-self: center"></div>
  <div class="item" style="grid-area: b; justify-self: center"></div>
</div>