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+<!DOCTYPE html>
+<meta charset="utf-8">
+<title>CSS Containment Test: Layout containment inside a fit-content element</title>
+<link rel="help" href="https://crbug.com/1268449">
+<link rel="help" href="https://drafts.csswg.org/css-contain-1/#containment-layout">
+<link rel="match" href="../reference/ref-filled-green-100px-square.xht">
+<meta name=assert
+ content="Layout containment inside a fit-content element should update size when the content is changed">
+<style>
+ #contain-parent {
+ width: fit-content;
+ }
+
+ #contain-layout {
+ contain: layout;
+ background: green;
+ }
+
+ #content {
+ width: 50px;
+ height: 100px;
+ }
+</style>
+<p>Test passes if there is a filled green square and <strong>no red</strong>.</p>
+<div id="contain-parent">
+ <div id="contain-layout">
+ <div id="content"></div>
+ </div>
+</div>
+
+<script>
+window.requestAnimationFrame(() => {
+ document.body.offsetTop;
+ document.getElementById('content').style.width = '100px';
+ document.body.offsetTop;
+});
+</script>