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+<!DOCTYPE html>
+<html class="reftest-wait">
+<link rel="author" title="Google LLC" href="http://www.google.com" />
+<link rel="help" href="https://drafts.csswg.org/css-flexbox/#line-sizing" />
+<title>css-flexbox: Tests that we use the aspect ratio, clamped by cross min/max, to compute the main size.</title>
+<link rel="match" href="../reference/ref-filled-green-100px-square.xht" />
+
+<style>
+#reference-overlapped-red {
+    position: absolute;
+    background-color: red;
+    width: 100px;
+    height: 100px;
+    z-index: -1;
+}
+
+#flex {
+  display: flex;
+  justify-content: flex-start;
+  align-items: flex-start;
+}
+
+img {
+  min-width: 0; /* Disable min-size: auto so we don't have to think about it. */
+  min-height: 100px;
+}
+</style>
+<script>
+// Force a relayout after the image loads to work around http://crbug.com/1042329
+window.onload = (event) => {
+  flex.style.width = "50px";
+  flex.offsetTop;
+  flex.style.removeProperty("width");
+  flex.offsetTop;
+  document.documentElement.classList.remove("reftest-wait")
+}
+</script>
+
+<p>Test passes if there is a filled green square and <strong>no red</strong>.</p>
+
+<div id="reference-overlapped-red"></div>
+<div style="width:60px; height: 100px; background: green; float: left;"></div>
+<div id="flex">
+  <img src="support/20x50-green.png">
+</div>