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Test Info:

<!DOCTYPE html>
<html><head>
<style>
.grid-container {
display: grid;
border: solid thick;
margin: 10px;
}
.columns {
grid-template-columns: repeat(auto-fill, 50px 50px);
grid-auto-rows: 25px;
grid-column-gap: 100px;
width: 300px;
}
.rows {
grid-auto-flow: column;
grid-template-rows: repeat(auto-fill, 50px 50px);
grid-auto-columns: 25px;
grid-row-gap: 100px;
width: min-content;
height: 300px;
}
.grid-container>div {
background: lime;
}
</style>
<style>
div { grid-column-start: first;}
</style>
</head>
<body>
<div class="grid-container columns">
<div></div>
<div></div>
<div></div>
<div></div>
</div>
<div class="grid-container columns"
style="grid-template-columns: repeat(auto-fill, 50px 50px 50px)">
<div></div>
<div></div>
<div></div>
<div></div>
</div>
<div class="grid-container columns"
style="grid-template-columns: repeat(auto-fill, 50px 50px 50px 50px)">
<div></div>
<div></div>
<div></div>
<div></div>
</div>
<div class="grid-container rows">
<div></div>
<div></div>
<div></div>
<div></div>
</div>
</body></html>