<!DOCTYPE html>
<title>CSS aspect-ratio: img block size with box-sizing</title>
<link rel="author" title="Mozilla" href="https://www.mozilla.org/">
<link rel="help" href="https://drafts.csswg.org/css-sizing-4/#aspect-ratio">
<link rel="match" href="../../reference/ref-filled-green-100px-square.xht" />
<style>
.border1 {
  border-left: 10px solid green;
}
.border2 {
  border-left: 15px solid green;
}
</style>

<p>Test passes if there is a filled green square and <strong>no red</strong>.</p>

<!--
  1st: A green rect 50x100.
       border-left is 10x100 and the content box is 40x100.
       We use 'aspect-ratio: auto && <ratio>', so the aspect-ratio works with
       content-box dimensions always. The inline size of the content box is
       (50px - 10px) = 40px, so the block size is 40px * 5/2 = 100px.
       (note: width here is the inline size of border-box.)

  2st: A green rect 25x100.
       border-left is 15x100 and the content box is 10x100.
       (note: width here is the inline size of content-box.)

  3nd: A green rect 25x100.
       border-left is 15x100 and the content box is 10x100 because we compute
       the block size by aspect-ratio which works with border-box and so the
       block size is 25px * 4 = 100.
       (note: width here is the inline size of border-box.)
-->
<img class="border1" src="support/20x50-green.png" style="width: 50px; aspect-ratio: auto 1/1; box-sizing: border-box;"
><img class="border2" src="support/20x50-green.png" style="width: 10px; aspect-ratio: 1/10; box-sizing: content-box;"
><img class="border2" src="support/20x50-green.png" style="width: 25px; aspect-ratio: 1/4; box-sizing: border-box;">