chromium/third_party/blink/web_tests/fast/css-grid-layout/percent-grid-item-in-percent-grid-track-in-percent-grid.html

<!DOCTYPE html>
<html>
<link href="resources/grid.css" rel="stylesheet">
<style>
.container {
    position: relative;
    width: 500px;
    height: 600px;
}

.grid {
    grid-template-columns: 40% 60%;
    grid-template-rows: 30% 70%;
    width: 80%;
    height: 50%;
}

.firstRowFirstColumn {
    width: 100%;
    height: 15px;
}

.firstRowSecondColumn {
    width: 15px;
    height: 100%;
}

.secondRowFirstColumn {
    width: 50%;
    height: 50%;
}

.secondRowSecondColumn {
    width: -webkit-calc(100%);
    height: -webkit-calc(100%);
}
</style>
<script src="../../resources/check-layout.js"></script>
<body onload="checkLayout('.grid')">

<p>Test that percentage sized grid items inside percentage sized grid tracks inside a percentage size grid get properly sized.</p>

<div class="container">
<div class="grid" data-expected-width="400" data-expected-height="300">
    <div class="firstRowFirstColumn" data-expected-width="160" data-expected-height="15"></div>
    <div class="firstRowSecondColumn" data-expected-width="15" data-expected-height="90"></div>
    <div class="secondRowFirstColumn" data-expected-width="80" data-expected-height="105"></div>
    <div class="secondRowSecondColumn" data-expected-width="240" data-expected-height="210"></div>
</div>
</div>

<div class="container">
<div class="grid verticalRL" data-expected-width="400" data-expected-height="300">
    <div class="firstRowFirstColumn" data-expected-width="120" data-expected-height="15"></div>
    <div class="firstRowSecondColumn" data-expected-width="15" data-expected-height="180"></div>
    <div class="secondRowFirstColumn" data-expected-width="140" data-expected-height="60"></div>
    <div class="secondRowSecondColumn" data-expected-width="280" data-expected-height="180"></div>
</div>
</div>

<div class="container">
<div class="grid verticalLR" data-expected-width="400" data-expected-height="300">
    <div class="firstRowFirstColumn" data-expected-width="120" data-expected-height="15"></div>
    <div class="firstRowSecondColumn" data-expected-width="15" data-expected-height="180"></div>
    <div class="secondRowFirstColumn" data-expected-width="140" data-expected-height="60"></div>
    <div class="secondRowSecondColumn" data-expected-width="280" data-expected-height="180"></div>
</div>
</div>

</body>
</html>