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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>