diff --git a/css/selectors/marker.json b/css/selectors/marker.json
index a832a6d274ab05..543f16e34c8292 100644
--- a/css/selectors/marker.json
+++ b/css/selectors/marker.json
@@ -72,6 +72,81 @@
               "deprecated": false
             }
           }
+        },
+        "counter_support": {
+          "__compat": {
+            "description": "[`counter-increment`](https://developer.mozilla.org/docs/Web/CSS/Reference/Properties/counter-increment), [`counter-reset`](https://developer.mozilla.org/docs/Web/CSS/Reference/Properties/counter-reset), and [`counter-set`](https://developer.mozilla.org/docs/Web/CSS/Reference/Properties/counter-set) support",
+            "spec_url": [
+              "https://drafts.csswg.org/css-lists/#propdef-counter-increment",
+              "https://drafts.csswg.org/css-lists/#propdef-counter-reset",
+              "https://drafts.csswg.org/css-lists/#propdef-counter-set"
+            ],
+            "tags": [
+              "web-features:marker"
+            ],
+            "support": {
+              "chrome": {
+                "version_added": false
+              },
+              "chrome_android": "mirror",
+              "edge": "mirror",
+              "firefox": {
+                "version_added": "147"
+              },
+              "firefox_android": "mirror",
+              "oculus": "mirror",
+              "opera": "mirror",
+              "opera_android": "mirror",
+              "safari": {
+                "version_added": false
+              },
+              "safari_ios": "mirror",
+              "samsunginternet_android": "mirror",
+              "webview_android": "mirror",
+              "webview_ios": "mirror"
+            },
+            "status": {
+              "experimental": true,
+              "standard_track": true,
+              "deprecated": false
+            }
+          }
+        },
+        "quotes_support": {
+          "__compat": {
+            "description": "`quotes` support",
+            "mdn_url": "https://developer.mozilla.org/docs/Web/CSS/Reference/Properties/quotes",
+            "spec_url": "https://drafts.csswg.org/css-content/#quotes",
+            "tags": [
+              "web-features:marker"
+            ],
+            "support": {
+              "chrome": {
+                "version_added": false
+              },
+              "chrome_android": "mirror",
+              "edge": "mirror",
+              "firefox": {
+                "version_added": "147"
+              },
+              "firefox_android": "mirror",
+              "oculus": "mirror",
+              "opera": "mirror",
+              "opera_android": "mirror",
+              "safari": {
+                "version_added": false
+              },
+              "safari_ios": "mirror",
+              "samsunginternet_android": "mirror",
+              "webview_android": "mirror",
+              "webview_ios": "mirror"
+            },
+            "status": {
+              "experimental": true,
+              "standard_track": true,
+              "deprecated": false
+            }
+          }
         }
       }
     }