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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>