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diff --git a/testing/web-platform/tests/html/semantics/forms/the-selectlist-element/selectlist-popover-position.tentative.html b/testing/web-platform/tests/html/semantics/forms/the-selectlist-element/selectlist-popover-position.tentative.html
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+++ b/testing/web-platform/tests/html/semantics/forms/the-selectlist-element/selectlist-popover-position.tentative.html
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+<!DOCTYPE html>
+<html>
+<title>HTMLSelectListElement Test: popover position</title>
+<link rel="author" title="Ionel Popescu" href="mailto:iopopesc@microsoft.com">
+<script src="/resources/testharness.js"></script>
+<script src="/resources/testharnessreport.js"></script>
+<script src="/resources/testdriver.js"></script>
+<script src="/resources/testdriver-actions.js"></script>
+<script src="/resources/testdriver-vendor.js"></script>
+
+<style>
+  #selectList0 {
+    position: absolute;
+    top: 0px;
+    left: 0px;
+  }
+
+  #selectList1 {
+    position: absolute;
+    bottom: 0px;
+    left: 0px;
+  }
+
+  #selectList2 {
+    position: absolute;
+    top: 0px;
+    right: 0px;
+  }
+
+  #selectList3 {
+    position: absolute;
+    bottom: 0px;
+    right: 0px;
+  }
+</style>
+
+<selectlist id="selectList0">
+  <div popover slot="listbox" behavior="listbox" id="selectList0-popover">
+    <option>bottom left</option>
+    <option>two</option>
+    <option>three</option>
+  </div>
+</selectlist>
+<br>
+
+<selectlist id="selectList1">
+  <div popover slot="listbox" behavior="listbox" id="selectList1-popover">
+    <option>top left</option>
+    <option>two</option>
+    <option>three</option>
+  </div>
+</selectlist>
+
+<selectlist id="selectList2">
+  <div popover slot="listbox" behavior="listbox" id="selectList2-popover">
+    <option>bottom right</option>
+    <option>two</option>
+    <option>three</option>
+  </div>
+</selectlist>
+
+<selectlist id="selectList3">
+  <div popover slot="listbox" behavior="listbox" id="selectList3-popover">
+    <option>top right</option>
+    <option>two</option>
+    <option>three</option>
+  </div>
+</selectlist>
+
+<script>
+  function clickOn(element) {
+    const actions = new test_driver.Actions();
+    return actions.pointerMove(0, 0, {origin: element})
+      .pointerDown({button: actions.ButtonType.LEFT})
+      .pointerUp({button: actions.ButtonType.LEFT})
+      .send();
+  }
+
+  promise_test(async () => {
+    const selectList0 = document.getElementById("selectList0");
+    const selectList0Popover = document.getElementById("selectList0-popover");
+
+    await clickOn(selectList0);
+    assert_equals(Math.abs(Math.trunc(selectList0.getBoundingClientRect().bottom - selectList0Popover.getBoundingClientRect().top)), 0);
+    assert_equals(Math.abs(Math.trunc(selectList0.getBoundingClientRect().left - selectList0Popover.getBoundingClientRect().left)), 0);
+  }, "The popover should be bottom left positioned");
+
+  promise_test(async () => {
+    const selectList1 = document.getElementById("selectList1");
+    const selectList1Popover = document.getElementById("selectList1-popover");
+
+    await clickOn(selectList1);
+    assert_equals(Math.abs(Math.trunc(selectList1.getBoundingClientRect().top - selectList1Popover.getBoundingClientRect().bottom)), 0);
+    assert_equals(Math.abs(Math.trunc(selectList1.getBoundingClientRect().left - selectList1Popover.getBoundingClientRect().left)), 0);
+  }, "The popover should be top left positioned");
+
+  promise_test(async () => {
+    const selectList2 = document.getElementById("selectList2");
+    const selectList2Popover = document.getElementById("selectList2-popover");
+
+    await clickOn(selectList2);
+    assert_equals(Math.abs(Math.trunc(selectList2.getBoundingClientRect().bottom - selectList2Popover.getBoundingClientRect().top)), 0);
+    assert_equals(Math.abs(Math.trunc(selectList2.getBoundingClientRect().right - selectList2Popover.getBoundingClientRect().right)), 0);
+  }, "The popover should be bottom right positioned");
+
+  promise_test(async () => {
+    const selectList3 = document.getElementById("selectList3");
+    const selectList3Popover = document.getElementById("selectList3-popover");
+
+    await clickOn(selectList3);
+    assert_equals(Math.abs(Math.trunc(selectList3.getBoundingClientRect().top - selectList3Popover.getBoundingClientRect().bottom)), 0);
+    assert_equals(Math.abs(Math.trunc(selectList3.getBoundingClientRect().right - selectList3Popover.getBoundingClientRect().right)), 0);
+  }, "The popover should be top right positioned");
+
+</script>