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<!DOCTYPE html>
<link rel="author" title="David Shin" href="mailto:dshin@mozilla.com">
<style>
.flex {
display: flex;
align-items: center;
width: 100%;
height: 100%;
}
.grid {
display: grid;
justify-items: center;
align-items: center;
width: 100%;
height: 100%;
}
.container {
border: 1px solid;
position: relative;
width: 100px;
height: 100px;
display: inline-block;
margin-right: 5px;
}
.abs {
width: 50px;
height: 50px;
position: absolute;
background: purple;
}
.center-inline {
left: 25px;
}
.left {
left: 0;
}
.top {
top: 0;
}
.center-block {
top: 25px;
}
</style>
<div class="container"><div class="flex">
<div class="abs left center-block"></div>
</div></div>
<div class="container"><div class="flex">
<div class="abs left top"></div>
</div></div>
<br>
<div class="container"><div class="grid">
<div class="abs center-inline center-block"></div>
</div></div>
<div class="container"><div class="grid">
<div class="abs center-inline top"></div>
</div></div>
<div class="container"><div class="grid">
<div class="abs left center-block"></div>
</div></div>
<div class="container"><div class="grid">
<div class="abs left top"></div>
</div></div>
<br>