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+<!DOCTYPE html>
+<meta charset="utf-8">
+<title>CSS Overflow: Scrollable Overflow Transform Dynamic Positioned Element</title>
+<link rel="author" title="Manuel Rego Casasnovas" href="mailto:rego@igalia.com">
+<link rel="help" href="https://drafts.csswg.org/css-overflow-3/#scrollable" />
+<meta name="assert" content="Checks that changes on an element's transform contribute to the scrollable overflow on a positioned element.">
+<script src="/resources/testharness.js"></script>
+<script src="/resources/testharnessreport.js"></script>
+<style>
+  .container {
+    position: absolute;
+    width: 100px;
+    height: 100px;
+    overflow: auto;
+    background: silver;
+    border: solid thick;
+  }
+
+  .element {
+    width: 50px;
+    height: 50px;
+    background: lime;
+  }
+</style>
+
+<div style="position: relative;">
+
+  <div id="container1" style="top: 0px;" class="container">
+    <div id="element1" style="transform: translateX(20px);" class="element"></div>
+  </div>
+
+  <div id="container2" style="top: 150px;"  class="container">
+    <div id="element2" style="transform: translateY(30px);" class="element"></div>
+  </div>
+
+  <div id="container3" style="top: 300px;"  class="container">
+    <div id="element3" style="transform: translate(20px, 30px);" class="element"></div>
+  </div>
+
+</div>
+
+<script>
+  test(() => {
+    assert_equals(container1.scrollWidth, 100);
+    element1.style.transform = "translateX(200px)";
+    assert_equals(container1.scrollWidth, 250);
+  }, "Check scrollWidth before and after transform chage");
+
+  test(() => {
+    assert_equals(container2.scrollHeight, 100);
+    element2.style.transform = "translateY(300px)";
+    assert_equals(container2.scrollHeight, 350);
+  }, "Check scrollHeight before and after transform chage");
+
+  test(() => {
+    assert_equals(container3.scrollWidth, 100);
+    assert_equals(container3.scrollHeight, 100);
+    element3.style.transform = "translate(200px, 300px)";
+    assert_equals(container3.scrollWidth, 250);
+    assert_equals(container3.scrollHeight, 350);
+  }, "Check scrollWidth and scrollHeight before and after transform chage");
+</script>