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Test Info:
<html>
<head>
    <style>
        .class_2, .class_3 {
            display: inline-grid;
            grid: repeat(3, 6%) repeat(1, minmax(1em, 3%))/repeat(1, auto);
            grid-row: i;
            grid-auto-columns: 1px;
        }
        .class_2 {
           grid-column: span 999999;
           grid-template-columns: subgrid repeat(99999, [a]) repeat(auto-fill,[b]);
        }
    </style>
</head>
<body>
<big class="class_3">
  <em class="class_2">
    <x style="grid-column:b">A</x>
    <x style="grid-column:a -1">A</x>
  </em>
</big>
</body>
</html>