diff --git a/tests/wpt/mozilla/meta/MANIFEST.json b/tests/wpt/mozilla/meta/MANIFEST.json
index 2fcfe5ff25b..32d55768235 100644
--- a/tests/wpt/mozilla/meta/MANIFEST.json
+++ b/tests/wpt/mozilla/meta/MANIFEST.json
@@ -5320,6 +5320,18 @@
             "url": "/_mozilla/css/transition_calc.html"
           }
         ],
+        "css/transition_calc_implicit.html": [
+          {
+            "path": "css/transition_calc_implicit.html",
+            "references": [
+              [
+                "/_mozilla/css/transition_calc_implicit_ref.html",
+                "=="
+              ]
+            ],
+            "url": "/_mozilla/css/transition_calc_implicit.html"
+          }
+        ],
         "css/translate_clip.html": [
           {
             "path": "css/translate_clip.html",
@@ -12440,6 +12452,18 @@
           "url": "/_mozilla/css/transition_calc.html"
         }
       ],
+      "css/transition_calc_implicit.html": [
+        {
+          "path": "css/transition_calc_implicit.html",
+          "references": [
+            [
+              "/_mozilla/css/transition_calc_implicit_ref.html",
+              "=="
+            ]
+          ],
+          "url": "/_mozilla/css/transition_calc_implicit.html"
+        }
+      ],
       "css/translate_clip.html": [
         {
           "path": "css/translate_clip.html",
diff --git a/tests/wpt/mozilla/tests/css/transition_calc_implicit.html b/tests/wpt/mozilla/tests/css/transition_calc_implicit.html
new file mode 100644
index 00000000000..a4cca7548ae
--- /dev/null
+++ b/tests/wpt/mozilla/tests/css/transition_calc_implicit.html
@@ -0,0 +1,21 @@
+<!DOCTYPE html>
+<link rel='match' href='transition_calc_implicit_ref.html'>
+<style>
+#inner {
+    transition: transform 0.01s;
+    height: 100px;
+    width: 100px;
+    transform: translate(1%, 1%);
+}
+.active {
+    transform: translate(0px, 1px) !important;
+}
+</style>
+<div id=inner></div>
+<script>
+requestAnimationFrame(function() {
+    var inner = document.getElementById('inner');
+    inner.className = 'active';
+    requestAnimationFrame(function() {});
+});
+</script>
diff --git a/tests/wpt/mozilla/tests/css/transition_calc_implicit_ref.html b/tests/wpt/mozilla/tests/css/transition_calc_implicit_ref.html
new file mode 100644
index 00000000000..0e76edd65b7
--- /dev/null
+++ b/tests/wpt/mozilla/tests/css/transition_calc_implicit_ref.html
@@ -0,0 +1 @@
+<!DOCTYPE html>
