Add sub features to CSS random() (#29081)

Author: Elchi3

css/types/random.json

@@ -4,7 +4,7 @@
       "random": {
         "__compat": {
           "description": "`random()`",
-          "spec_url": "https://www.w3.org/TR/css-values-5/#random",
+          "spec_url": "https://drafts.csswg.org/css-values-5/#random",
           "tags": [
             "web-features:random-function"
           ],
@@ -34,6 +34,99 @@
             "standard_track": true,
             "deprecated": false
           }
+        },
+        "dashed-ident": {
+          "__compat": {
+            "spec_url": "https://drafts.csswg.org/css-values-5/#valdef-random-dashed-ident",
+            "support": {
+              "chrome": {
+                "version_added": false
+              },
+              "chrome_android": "mirror",
+              "edge": "mirror",
+              "firefox": {
+                "version_added": false
+              },
+              "firefox_android": "mirror",
+              "oculus": "mirror",
+              "opera": "mirror",
+              "opera_android": "mirror",
+              "safari": {
+                "version_added": "26.2"
+              },
+              "safari_ios": "mirror",
+              "samsunginternet_android": "mirror",
+              "webview_android": "mirror",
+              "webview_ios": "mirror"
+            },
+            "status": {
+              "experimental": true,
+              "standard_track": true,
+              "deprecated": false
+            }
+          }
+        },
+        "element-shared": {
+          "__compat": {
+            "spec_url": "https://drafts.csswg.org/css-values-5/#valdef-random-element-shared",
+            "support": {
+              "chrome": {
+                "version_added": false
+              },
+              "chrome_android": "mirror",
+              "edge": "mirror",
+              "firefox": {
+                "version_added": false
+              },
+              "firefox_android": "mirror",
+              "oculus": "mirror",
+              "opera": "mirror",
+              "opera_android": "mirror",
+              "safari": {
+                "version_added": "26.2"
+              },
+              "safari_ios": "mirror",
+              "samsunginternet_android": "mirror",
+              "webview_android": "mirror",
+              "webview_ios": "mirror"
+            },
+            "status": {
+              "experimental": true,
+              "standard_track": true,
+              "deprecated": false
+            }
+          }
+        },
+        "step": {
+          "__compat": {
+            "spec_url": "https://drafts.csswg.org/css-values-5/#ref-for-typedef-calc-sum①⑧",
+            "support": {
+              "chrome": {
+                "version_added": false
+              },
+              "chrome_android": "mirror",
+              "edge": "mirror",
+              "firefox": {
+                "version_added": false
+              },
+              "firefox_android": "mirror",
+              "oculus": "mirror",
+              "opera": "mirror",
+              "opera_android": "mirror",
+              "safari": {
+                "version_added": "26.2"
+              },
+              "safari_ios": "mirror",
+              "samsunginternet_android": "mirror",
+              "webview_android": "mirror",
+              "webview_ios": "mirror"
+            },
+            "status": {
+              "experimental": true,
+              "standard_track": true,
+              "deprecated": false
+            }
+          }
         }
       }
     }