--- a/testing/web-platform/meta/MANIFEST.json
+++ b/testing/web-platform/meta/MANIFEST.json
@@ -37260,16 +37260,64 @@
         "pointerevents/pointerevent_setpointercapture_to_same_element_twice-manual.html": [
           {
             "path": "pointerevents/pointerevent_setpointercapture_to_same_element_twice-manual.html",
             "url": "/pointerevents/pointerevent_setpointercapture_to_same_element_twice-manual.html"
           }
         ]
       },
       "reftest": {
+        "html/semantics/grouping-content/the-ol-element/reversed-1a.html": [
+          {
+            "path": "html/semantics/grouping-content/the-ol-element/reversed-1a.html",
+            "references": [
+              [
+                "/html/semantics/grouping-content/the-ol-element/reversed-1-ref.html",
+                "=="
+              ]
+            ],
+            "url": "/html/semantics/grouping-content/the-ol-element/reversed-1a.html"
+          }
+        ],
+        "html/semantics/grouping-content/the-ol-element/reversed-1b.html": [
+          {
+            "path": "html/semantics/grouping-content/the-ol-element/reversed-1b.html",
+            "references": [
+              [
+                "/html/semantics/grouping-content/the-ol-element/reversed-1-ref.html",
+                "=="
+              ]
+            ],
+            "url": "/html/semantics/grouping-content/the-ol-element/reversed-1b.html"
+          }
+        ],
+        "html/semantics/grouping-content/the-ol-element/reversed-1c.html": [
+          {
+            "path": "html/semantics/grouping-content/the-ol-element/reversed-1c.html",
+            "references": [
+              [
+                "/html/semantics/grouping-content/the-ol-element/reversed-1-ref.html",
+                "=="
+              ]
+            ],
+            "url": "/html/semantics/grouping-content/the-ol-element/reversed-1c.html"
+          }
+        ],
+        "html/semantics/grouping-content/the-ol-element/reversed-1d.html": [
+          {
+            "path": "html/semantics/grouping-content/the-ol-element/reversed-1d.html",
+            "references": [
+              [
+                "/html/semantics/grouping-content/the-ol-element/reversed-1-ref.html",
+                "=="
+              ]
+            ],
+            "url": "/html/semantics/grouping-content/the-ol-element/reversed-1d.html"
+          }
+        ],
         "svg/linking/reftests/href-a-element-attr-change.html": [
           {
             "path": "svg/linking/reftests/href-a-element-attr-change.html",
             "references": [
               [
                 "/svg/linking/reftests/href-a-element-ref.html",
                 "=="
               ]
@@ -37512,16 +37560,64 @@
           {
             "path": "workers/Worker_ErrorEvent_error.htm",
             "url": "/workers/Worker_ErrorEvent_error.htm"
           }
         ]
       }
     },
     "reftest_nodes": {
+      "html/semantics/grouping-content/the-ol-element/reversed-1a.html": [
+        {
+          "path": "html/semantics/grouping-content/the-ol-element/reversed-1a.html",
+          "references": [
+            [
+              "/html/semantics/grouping-content/the-ol-element/reversed-1-ref.html",
+              "=="
+            ]
+          ],
+          "url": "/html/semantics/grouping-content/the-ol-element/reversed-1a.html"
+        }
+      ],
+      "html/semantics/grouping-content/the-ol-element/reversed-1b.html": [
+        {
+          "path": "html/semantics/grouping-content/the-ol-element/reversed-1b.html",
+          "references": [
+            [
+              "/html/semantics/grouping-content/the-ol-element/reversed-1-ref.html",
+              "=="
+            ]
+          ],
+          "url": "/html/semantics/grouping-content/the-ol-element/reversed-1b.html"
+        }
+      ],
+      "html/semantics/grouping-content/the-ol-element/reversed-1c.html": [
+        {
+          "path": "html/semantics/grouping-content/the-ol-element/reversed-1c.html",
+          "references": [
+            [
+              "/html/semantics/grouping-content/the-ol-element/reversed-1-ref.html",
+              "=="
+            ]
+          ],
+          "url": "/html/semantics/grouping-content/the-ol-element/reversed-1c.html"
+        }
+      ],
+      "html/semantics/grouping-content/the-ol-element/reversed-1d.html": [
+        {
+          "path": "html/semantics/grouping-content/the-ol-element/reversed-1d.html",
+          "references": [
+            [
+              "/html/semantics/grouping-content/the-ol-element/reversed-1-ref.html",
+              "=="
+            ]
+          ],
+          "url": "/html/semantics/grouping-content/the-ol-element/reversed-1d.html"
+        }
+      ],
       "svg/linking/reftests/href-a-element-attr-change.html": [
         {
           "path": "svg/linking/reftests/href-a-element-attr-change.html",
           "references": [
             [
               "/svg/linking/reftests/href-a-element-ref.html",
               "=="
             ]

--- a/testing/web-platform/tests/html/semantics/grouping-content/the-ol-element/reversed-1a.html
+++ b/testing/web-platform/tests/html/semantics/grouping-content/the-ol-element/reversed-1a.html
@@ -1,6 +1,10 @@
 <!DOCTYPE html>
+<meta charset=utf-8>
+<title>`reversed` should reverse the numbering correctly</title>
+<link rel=match href="reversed-1-ref.html">
+<link rel=help href="https://html.spec.whatwg.org/#attr-ol-reversed">
 <ol reversed>
   <li>Three</li>
   <li>Two</li>
   <li>One</li>
 </ol>

--- a/testing/web-platform/tests/html/semantics/grouping-content/the-ol-element/reversed-1b.html
+++ b/testing/web-platform/tests/html/semantics/grouping-content/the-ol-element/reversed-1b.html
@@ -1,9 +1,13 @@
 <!DOCTYPE html>
+<meta charset=utf-8>
+<title>Dynamically setting `reversed` should update the numbering</title>
+<link rel=match href="reversed-1-ref.html">
+<link rel=help href="https://html.spec.whatwg.org/#attr-ol-reversed">
 <ol id="x">
   <li>Three</li>
   <li>Two</li>
   <li>One</li>
 </ol>
 <script>
   var l = document.getElementById("x");
   var w = l.offsetWidth;

--- a/testing/web-platform/tests/html/semantics/grouping-content/the-ol-element/reversed-1c.html
+++ b/testing/web-platform/tests/html/semantics/grouping-content/the-ol-element/reversed-1c.html
@@ -1,9 +1,13 @@
 <!DOCTYPE html>
+<meta charset=utf-8>
+<title>Reversed numbering should update on dynamic addition of child nodes</title>
+<link rel=match href="reversed-1-ref.html">
+<link rel=help href="https://html.spec.whatwg.org/#attr-ol-reversed">
 <ol id="x" reversed>
   <li>Three</li>
   <li>Two</li>
 </ol>
 <script>
   var l = document.getElementById("x");
   var w = l.offsetWidth;
   var li = document.createElement("li");

new file mode 100644
--- /dev/null
+++ b/testing/web-platform/tests/html/semantics/grouping-content/the-ol-element/reversed-1d.html
@@ -0,0 +1,12 @@
+<!DOCTYPE html>
+<meta charset=utf-8>
+<title>Reverse numbering should not be affected by nested div</title>
+<link rel=match href="reversed-1-ref.html">
+<link rel=help href="https://html.spec.whatwg.org/#attr-ol-reversed">
+<ol reversed>
+  <li>Three</li>
+  <div>
+      <li>Two</li>
+      <li>One</li>
+  </div>
+</ol>