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diff --git a/testing/web-platform/mozilla/tests/html/rendering/non-replaced-elements/form-controls/range-snap-to-tick-marks-03.html b/testing/web-platform/mozilla/tests/html/rendering/non-replaced-elements/form-controls/range-snap-to-tick-marks-03.html
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index 0000000000..9397c39e0a
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+++ b/testing/web-platform/mozilla/tests/html/rendering/non-replaced-elements/form-controls/range-snap-to-tick-marks-03.html
@@ -0,0 +1,46 @@
+<!doctype html>
+<meta charset=utf-8>
+<meta name=viewport content=width=device-width>
+<title>Snap to a vertical slider's tick marks by clicking near them</title>
+<link rel=help href="https://html.spec.whatwg.org/multipage/rendering.html#the-input-element-as-a-range-control">
+<link rel=help href="https://bugzilla.mozilla.org/show_bug.cgi?id=1803118">
+<link rel=author href="mailto:zach@zrhoffman.net" title="Zach Hoffman">
+<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>
+  input[type=range] {
+    writing-mode: vertical-lr;
+    direction: rtl; /* so the range progresses upwards, not downwards */
+  }
+</style>
+<input type=range list=tickmarks min=-5 max=35>
+<datalist id=tickmarks>
+  <option value=0></option>
+  <option value=3></option>
+</datalist>
+<script>
+  const range = document.querySelector("input[type=range]");
+  promise_test(async function snapToVerticalTickMarks() {
+    const assertions = [[-3, "-3"], [-2, "0"], [1, "0"], [2, "3"], [5, "3"], [6, "6"]];
+    const rect = range.getBoundingClientRect();
+    const padding = 10;
+    const bottom = rect.bottom - padding;
+    const height = rect.height - 2 * padding;
+    const actions = new test_driver.Actions();
+    const min = parseInt(range.min);
+    const max = parseInt(range.max);
+    for (const assertion of assertions) {
+      const moveTo = (bottom - height * (assertion[0] - min) / (max - min)) | 0;
+      const expected = assertion[1];
+      await actions
+          .pointerMove(rect.left, moveTo)
+          .pointerDown()
+          .pointerUp()
+          .send();
+      assert_equals(range.value, expected);
+    }
+  });
+</script>