css/css-sizing/intrinsic-ratio-replaced-box-sizing.html

<!DOCTYPE html>
<meta charset="utf-8">
<title>Replaced sizing should account properly for border-box sizing</title>
<link rel="help" href="https://drafts.csswg.org/css-sizing-3/#intrinsic">
<link rel="help" href="https://bugzilla.mozilla.org/show_bug.cgi?id=1978106">
<link rel="match" href="intrinsic-ratio-replaced-box-sizing-ref.html">
<link rel="author" title="Emilio Cobos Álvarez" href="mailto:emilio@crisal.io">
<link rel="author" title="Mozilla" href="https://mozilla.com">
<style>
svg, img {
  margin: 5px;
  border: 10px solid grey;
}

.border-box {
  box-sizing: border-box;
}

div {
  display: inline-block;
  margin: 10px;
  border: 1px solid black;
  width: 100px;
  height: 100px;
}
</style>
<div>
  <img src="data:image/svg+xml;charset=UTF-8,<svg viewBox='0 0 100 100' xmlns='http://www.w3.org/2000/svg'><rect width='100%' height='100%' fill='lime'/></svg>">
</div>
<div>
  <img src="data:image/svg+xml;charset=UTF-8,<svg viewBox='0 0 100 100' xmlns='http://www.w3.org/2000/svg'><rect width='100%' height='100%' fill='lime'/></svg>" class="border-box">
</div>
<div>
  <svg viewBox="0 0 100 100"><rect width="100%" height="100%" fill="lime"></rect></svg>
</div>
<div>
  <svg viewBox="0 0 100 100" class="border-box"><rect width="100%" height="100%" fill="lime"></rect></svg>
</div>