1 files changed, 42 insertions, 0 deletions
diff --git a/testing/web-platform/tests/html/semantics/forms/the-input-element/input-stepdown-02.html b/testing/web-platform/tests/html/semantics/forms/the-input-element/input-stepdown-02.html
new file mode 100644
index 0000000000..db71d11009
--- /dev/null
+++ b/testing/web-platform/tests/html/semantics/forms/the-input-element/input-stepdown-02.html
@@ -0,0 +1,42 @@
+<!DOCTYPE HTML>
+<title>Input Step Down</title>
+
+<link rel="help" href="https://html.spec.whatwg.org/multipage/input.html#dom-input-stepup">
+
+<script src="/resources/testharness.js"></script>
+<script src="/resources/testharnessreport.js"></script>
+
+<input type='number' id='input'>
+
+<script>
+  const input = document.getElementById("input");
+
+  function testStepDown(initialValue, minValue, expectedValue) {
+    input.value = initialValue;
+    input.min = minValue;
+
+    input.stepDown();
+
+    assert_equals(input.value, expectedValue);
+  }
+
+  const tests = [
+    { initialValue: '', minValue: '', expectedValue: '-1', description: 'stepDown() on input with no initial or min values' },
+    { initialValue: '', minValue: '7', expectedValue: '7', description: 'stepDown() on input with no initial value and positive min value' },
+    { initialValue: '', minValue: '-7', expectedValue: '-1', description: 'stepDown() on input with no initial value and negative min value' },
+    { initialValue: '7', minValue: '7', expectedValue: '7', description: 'stepDown() on input with initial value equal to min value' },
+    { initialValue: '3', minValue: '7', expectedValue: '3', description: 'stepDown() on input with initial value less than min value' },
+    { initialValue: '10', minValue: '7', expectedValue: '9', description: 'stepDown() on input with initial value greater than min value' },
+  ];
+
+  for(const t of tests) {
+    test(()=>{
+      testStepDown(
+        t.initialValue,
+        t.minValue,
+        t.expectedValue
+      );
+    },
+    t.description);
+  }
+</script>