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<!DOCTYPE html>
<link rel="help" href="https://drafts.csswg.org/css-gaps-1/">
<link rel="author" title="Javier Contreras" href="mailto:javiercon@microsoft.com">
<style>
body {
margin: 0;
}
.multi-column {
position: relative;
height: 47px;
column-width: 110px;
width: 350px;
column-gap: 10px;
}
#flexbox {
display: flex;
flex-wrap: wrap;
height: 110px;
column-gap: 10px;
width: 110px;
background: lightgreen;
}
#monolithic {
contain: size;
}
.items {
background: lightblue;
width: 50px;
}
.column-rule {
position: absolute;
height: 55px;
background: gold;
width: 10px;
top: 0px;
}
</style>
<div class="multi-column">
<div class="column-rule" style="left: 50px;"></div>
<div class="column-rule" style="left: 170px; height: 47px;"></div>
<div class="column-rule" style="left: 290px; height: 8px;"></div>
<div id="flexbox">
<div class="items">1</div>
<div class="items" id="monolithic">2</div>
<div class="items">3</div>
<div class="items">4</div>
</div>
</div>