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chromium/third_party/blink/web_tests/fast/css-grid-layout/grid-painting-items-only-once.html 

<!DOCTYPE html>
<html>
<head>
    <link href="resources/grid.css" rel="stylesheet">
    <style>
        .grid2Rows2Columns {
            grid-template-columns: auto auto;
            grid-template-rows: auto auto;
        }

        .gridAreas2Rows {
            grid-template-areas: "a a"
                                 "b b";
        }

        .gridAreas2Columns {
            grid-template-areas: "a b"
                                 "a b";
        }

        .areaA {
            grid-area: a;
        }

        .areaB {
            grid-area: b;
        }
    </style>
</head>
<body>
    <div>
        This test shows 4 grids where all the items are placed in several cells (span or areas).<br>
        It passes if these grid items are painted only once.
    </div>
    <div class="grid grid2Rows2Columns">
        <div class="firstRowBothColumn">item</div>
        <div class="secondRowBothColumn">item</div>
    </div>
    <div class="grid grid2Rows2Columns">
        <div class="bothRowFirstColumn">item</div>
        <div class="bothRowSecondColumn">item</div>
    </div>
    <div class="grid gridAreas2Rows">
        <div class="areaA">item</div>
        <div class="areaB">item</div>
    </div>
    <div class="grid gridAreas2Columns">
        <div class="areaA">item</div>
        <div class="areaB">item</div>
    </div>
</body>
</html>