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diff --git a/testing/web-platform/tests/html/browsers/the-window-object/open-close/open-features-tokenization-screenx-screeny.html b/testing/web-platform/tests/html/browsers/the-window-object/open-close/open-features-tokenization-screenx-screeny.html
new file mode 100644
index 0000000000..5a53fefc40
--- /dev/null
+++ b/testing/web-platform/tests/html/browsers/the-window-object/open-close/open-features-tokenization-screenx-screeny.html
@@ -0,0 +1,55 @@
+<!DOCTYPE html>
+<meta charset="utf-8">
+<title>HTML: window.open `features`: tokenization -- legacy position features `screenx`, `screeny`</title>
+<meta name=timeout content=long>
+<link rel="help" href="https://html.spec.whatwg.org/multipage/#apis-for-creating-and-navigating-browsing-contexts-by-name">
+
+<!-- user agents are not required to support open features other than `noopener`
+     and on some platforms position and size features don't make sense -->
+<meta name="flags" content="may" />
+
+<script src="/resources/testharness.js"></script>
+<script src="/resources/testharnessreport.js"></script>
+<script src="/common/PrefixedPostMessage.js"></script>
+<script>
+var windowURL = 'resources/message-opener.html';
+var width = 'width=401,';
+var height = 'height=402,';
+
+[ 'screenx=141',
+  ' screenx = 141',
+  'screenx==141',
+  '\nscreenx= 141',
+  ',screenx=141,,',
+  'SCREENX=141',
+  'screenX=141'
+].forEach((features, idx, arr) => {
+  async_test(t => {
+    var prefixedMessage = new PrefixedMessageTest();
+    prefixedMessage.onMessage(t.step_func_done((data, e) => {
+      e.source.close();
+      assert_equals(data.left, 141);
+    }));
+    var win = window.open(prefixedMessage.url(windowURL) + '&expected_screenX=141', '', width + height + features);
+  }, `${format_value(features)} should set left position of opened window`);
+});
+
+[ 'screeny=142',
+  ' screeny = 142',
+  'screeny==142',
+  '\nscreeny= 142',
+  ',screeny=142,,',
+  'SCREENY=142',
+  'screenY=142'
+].forEach((features, idx, arr) => {
+  async_test(t => {
+    var prefixedMessage = new PrefixedMessageTest();
+    prefixedMessage.onMessage(t.step_func_done((data, e) => {
+      e.source.close();
+      assert_equals(data.top, 142);
+    }));
+    var win = window.open(prefixedMessage.url(windowURL) + '&expected_screenY=142', '', width + height + features);
+  }, `${format_value(features)} should set top position of opened window`);
+});
+
+</script>