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diff --git a/testing/web-platform/tests/html/rendering/non-replaced-elements/form-controls/placeholder-opacity-default.tentative.html b/testing/web-platform/tests/html/rendering/non-replaced-elements/form-controls/placeholder-opacity-default.tentative.html
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+++ b/testing/web-platform/tests/html/rendering/non-replaced-elements/form-controls/placeholder-opacity-default.tentative.html
@@ -0,0 +1,25 @@
+<!DOCTYPE html>
+<html>
+  <head>
+    <meta charset="utf-8" />
+    <title>Placeholder Test: opacity default value</title>
+    <link rel="author" title="Karl Dubost" href="mailto:kdubost@mozilla.com"
+    />
+    <link rel="help" href="https://drafts.csswg.org/css-pseudo-4/#placeholder-pseudo"
+    />
+    <script src="/resources/testharness.js"></script>
+    <script src="/resources/testharnessreport.js"></script>
+  </head>
+  <body>
+    <input
+      id="opacity"
+      placeholder="::placeholder should have default opacity: 1"
+    />
+    <script>
+      test(function () {
+        var target = document.getElementById("opacity");
+        assert_equals(getComputedStyle(target, '::placeholder').opacity, "1");
+      }, "Default opacity value is '1'");
+    </script>
+  </body>
+</html>