Split CSSStyleSheet baseURL parameter into a subfeature (#22940)

This will make it easier to deal with in web-features.

Author: foolip

api/CSSStyleSheet.json

@@ -49,9 +49,7 @@
           ],
           "support": {
             "chrome": {
-              "version_added": "73",
-              "partial_implementation": true,
-              "notes": "The <code>baseURL</code> option property is not supported. See <a href='https://crbug.com/40207149'>bug 40207149</a>."
+              "version_added": "73"
             },
             "chrome_android": "mirror",
             "edge": "mirror",
@@ -77,6 +75,44 @@
             "standard_track": true,
             "deprecated": false
           }
+        },
+        "options_baseURL_parameter": {
+          "__compat": {
+            "description": "<code>options.baseURL</code> parameter",
+            "spec_url": "https://drafts.csswg.org/cssom/#dom-cssstylesheetinit-baseurl",
+            "tags": [
+              "web-features:constructed-stylesheets"
+            ],
+            "support": {
+              "chrome": {
+                "version_added": false,
+                "impl_url": "https://crbug.com/40207149"
+              },
+              "chrome_android": "mirror",
+              "edge": "mirror",
+              "firefox": {
+                "version_added": "101"
+              },
+              "firefox_android": "mirror",
+              "ie": {
+                "version_added": false
+              },
+              "oculus": "mirror",
+              "opera": "mirror",
+              "opera_android": "mirror",
+              "safari": {
+                "version_added": "16.4"
+              },
+              "safari_ios": "mirror",
+              "samsunginternet_android": "mirror",
+              "webview_android": "mirror"
+            },
+            "status": {
+              "experimental": false,
+              "standard_track": true,
+              "deprecated": false
+            }
+          }
         }
       },
       "addRule": {