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<!doctype html>
<title>CSS Test Reference</title>
<style>
.container, .not_a_container {
width: auto;
height: 100px;
border: 1px solid black;
margin-bottom: 10px;
}
span {
border: 1px solid green;
margin: 2px;
}
</style>
<div style="width:150px">
<div class=container>
<main>
<div style="display:flex">
<span style="flex:1">Test1</span>
<span style="flex:1">Test2</span>
<span style="flex:1">Test3</span>
</div>
</main>
</div>
</div>
<div style="width:200px">
<div class=container>
<main>
<div>
<span style="display:block">Test1</span>
<span style="display:block">Test2</span>
<span style="display:block">Test3</span>
</div>
</main>
</div>
</div>
<div style="width:150px">
<div class=not_a_container>
<main>
<div>
<span>Test1</span>
<span>Test2</span>
<span>Test3</span>
</div>
</main>
</div>
</div>