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+<!DOCTYPE html>
+<title>CSS aspect-ratio: img inline 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>
+img {
+  border-top: 40px solid green;
+}
+</style>
+
+<p>Test passes if there is a filled green square and <strong>no red</strong>.</p>
+
+<!--
+  1st: A green rect 60x100.
+       border-top is 60x40 and the content box is 60x60.
+       We use 'aspect-ratio: auto && <ratio>', so the aspect-ratio works with
+       content-box dimensions always. The block size of the content box is
+       (100px - 40px) = 60px, so the inline size is 60px * 1/1 = 60px.
+       (note: height here is the block size of border-box.)
+
+  2nd: A green rect 20x100.
+       border-top is 20x40 and the content box is 20x60.
+       (note: height here is the block size of content-box.)
+
+  3rd: A green rect 10x100.
+       border-top is 10x40 and the content box is 10x60 because we compute
+       the inline size by aspect-ratio which works with border-box and so the
+       inline size is 100px / 10 = 10px.
+       (note: height here is the block size of border-box.)
+
+  4th: A green rect 10x100.
+       border-top is 10x40 and the content box is 10x60 to add up to 10x100.
+-->
+<img src="support/1x1-green.png" style="height: 100px; aspect-ratio: auto 1/10; box-sizing: border-box;"
+><img src="support/1x1-green.png" style="height: 60px; aspect-ratio: 1/3; box-sizing: content-box;"
+><img src="support/1x1-green.png" style="height: 100px; aspect-ratio: 1/10; box-sizing: border-box;"
+><img src="support/1x1-green.png" style="width: 10px; aspect-ratio: 1/6; box-sizing: content-box;">