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diff --git a/testing/web-platform/tests/css/css-position/position-absolute-dynamic-static-position-margin-001.html b/testing/web-platform/tests/css/css-position/position-absolute-dynamic-static-position-margin-001.html
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+++ b/testing/web-platform/tests/css/css-position/position-absolute-dynamic-static-position-margin-001.html
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+<!DOCTYPE html>
+<html class='reftest-wait'>
+<link rel="match" href="../reference/ref-filled-green-100px-square-only.html">
+<link rel="help" href="https://www.w3.org/TR/css-position-3/" />
+<meta name="assert" content="This test checks that a dynamic change in constraints calculates the static position correctly."/>
+<script src="/common/reftest-wait.js"></script>
+<style>
+#container {
+ position: relative;
+ background: red;
+
+ box-sizing: border-box;
+ border: solid green 10px;
+ width: 100px;
+ height: 100px;
+}
+
+#block {
+ background: green;
+ height: 40px;
+ margin-bottom: 20px;
+}
+
+#target {
+ position: absolute;
+ background: green;
+
+ width: 80px;
+ height: 20px;
+ top: -10px;
+ left: -10px;
+}
+
+#cover {
+ position: absolute;
+ background: green;
+
+ width: 80px;
+ height: 20px;
+ top: 40px;
+ left: 0px;
+}
+</style>
+<p>Test passes if there is a filled green square.</p>
+<div id="container">
+ <div id="block"></div>
+ <div id="target"></div>
+ <div id="cover"></div>
+</div>
+<script>
+document.body.offsetTop;
+const target = document.getElementById('target');
+target.style.top = 'initial';
+target.style.left = 'initial';
+document.body.offsetTop;
+takeScreenshot();
+</script>