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Test Info:
<!DOCTYPE HTML>
<!--
any copyright is dedicated to the public domain.
-->
<html><head>
<style>
html,body {
color:black; background-color:white; font:15px/1 monospace; padding:0; margin:0;
}
.grid {
display: grid;
width: min-content;
grid-template-columns: repeat(9998,0) repeat(auto-fill, 5px 10px 15px 20px);
grid-auto-columns: 500px; /* should not be used */
border: 1px solid;
margin-bottom: 2px;
}
x { grid-column: 1 / foo; }
</style>
</head>
<body>
<div class="grid"><x></x></div>
<script>
document.body.offsetHeight;
window.getComputedStyle(document.querySelectorAll('.grid')[0]).gridTemplateColumns;
</script>
</body>
</html>