testing/web-platform/tests/css/css-layout-api/constraints/support/constraints-fixed-block-size-quirky-body-iframe.html


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<style>
body {
  margin: 0;
  --expected-block-size: 200;
}

.child {
  background: green;
}

@supports (display: layout(test)) {
  body {
    display: layout(test);
  }
}
</style>

<!-- In Quirks mode, we should stretch to 100% of the inital containing block. -->
<body>
<div class="child"></div>
</body>