1 files changed, 34 insertions, 0 deletions
diff --git a/testing/web-platform/tests/css/cssom-view/scrollIntoView-shadow.html b/testing/web-platform/tests/css/cssom-view/scrollIntoView-shadow.html
new file mode 100644
index 0000000000..3b19e1ef5a
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+++ b/testing/web-platform/tests/css/cssom-view/scrollIntoView-shadow.html
@@ -0,0 +1,34 @@
+<!DOCTYPE HTML>
+<meta name="viewport" content="user-scalable=no">
+<script src="/resources/testharness.js"></script>
+<script src="/resources/testharnessreport.js"></script>
+<title>Check End Position of scrollIntoView of shadow elements</title>
+<div id="container">
+  <div id="space1" style="height: 2000px; width: 2000px;background-color: yellow">
+  </div>
+  <div id="shadow"></div>
+  <div id="space2" style="height: 2000px; width: 2000px;background-color: blue">
+  </div>
+</div>
+<script>
+add_completion_callback(() => document.getElementById("container").remove());
+
+test(t => {
+  var shadow = document.getElementById("shadow");
+  var shadowRoot = shadow.attachShadow({ mode: "open" });
+  var shadowDiv = document.createElement("div");
+  shadowDiv.style.height = "200px";
+  shadowDiv.style.width = "200px";
+  shadowDiv.style.backgroundColor = "green";
+  shadowRoot.appendChild(shadowDiv);
+
+  window.scrollTo(0, 0);
+  var expected_x = shadowDiv.offsetLeft;
+  var expected_y = shadowDiv.offsetTop;
+  assert_not_equals(window.scrollX, expected_x);
+  assert_not_equals(window.scrollY, expected_y);
+  shadowDiv.scrollIntoView({block: "start", inline: "start"});
+  assert_approx_equals(window.scrollX, expected_x, 1);
+  assert_approx_equals(window.scrollY, expected_y, 1);
+}, "scrollIntoView should behave correctly if applies to shadow dom elements");
+</script>