Add {accent,stop}-color: transparent (#29532)

Add missing transparent values to accent/stop-color

Author: Elchi3

css/properties/accent-color.json

@@ -104,6 +104,37 @@
               "deprecated": false
             }
           }
+        },
+        "transparent": {
+          "__compat": {
+            "spec_url": "https://drafts.csswg.org/css-color-4/#transparent-color",
+            "support": {
+              "chrome": {
+                "version_added": "93"
+              },
+              "chrome_android": "mirror",
+              "edge": "mirror",
+              "firefox": {
+                "version_added": "92"
+              },
+              "firefox_android": "mirror",
+              "oculus": "mirror",
+              "opera": "mirror",
+              "opera_android": "mirror",
+              "safari": {
+                "version_added": "15.4"
+              },
+              "safari_ios": "mirror",
+              "samsunginternet_android": "mirror",
+              "webview_android": "mirror",
+              "webview_ios": "mirror"
+            },
+            "status": {
+              "experimental": false,
+              "standard_track": true,
+              "deprecated": false
+            }
+          }
         }
       }
     }

css/properties/stop-color.json

@@ -71,6 +71,41 @@
               "deprecated": false
             }
           }
+        },
+        "transparent": {
+          "__compat": {
+            "spec_url": "https://drafts.csswg.org/css-color-4/#transparent-color",
+            "support": {
+              "chrome": {
+                "version_added": "1"
+              },
+              "chrome_android": "mirror",
+              "edge": {
+                "version_added": "≤15"
+              },
+              "firefox": {
+                "version_added": "3"
+              },
+              "firefox_android": "mirror",
+              "oculus": "mirror",
+              "opera": "mirror",
+              "opera_android": "mirror",
+              "safari": {
+                "version_added": "4"
+              },
+              "safari_ios": "mirror",
+              "samsunginternet_android": "mirror",
+              "webview_android": {
+                "version_added": "37"
+              },
+              "webview_ios": "mirror"
+            },
+            "status": {
+              "experimental": false,
+              "standard_track": true,
+              "deprecated": false
+            }
+          }
         }
       }
     }