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<!DOCTYPE html>
<style>
div {
display: inline-block;
width: 80px;
height: 80px;
background: lightblue;
outline-style: solid;
margin: 20px;
}
.w3 { outline-width: 3px; outline-offset: -3px; }
.w8 { outline-width: 8px; outline-offset: -8px; }
.w12 { outline-width: 12px; outline-offset: -12px; }
</style>
<div class="w3"></div>
<div class="w8"></div>
<div class="w12"></div>