Merge CSS position-visibility legacy anchors-* values into anchor-*

Author: caugner

css/properties/position-visibility.json

@@ -79,15 +79,22 @@
               "chrome_android": "mirror",
               "edge": "mirror",
               "firefox": {
-                "version_added": false
+                "alternative_name": "anchors-valid",
+                "version_added": "147"
               },
               "firefox_android": "mirror",
               "oculus": "mirror",
               "opera": "mirror",
               "opera_android": "mirror",
-              "safari": {
-                "version_added": "27"
-              },
+              "safari": [
+                {
+                  "version_added": "27"
+                },
+                {
+                  "alternative_name": "anchors-valid",
+                  "version_added": "26.2"
+                }
+              ],
               "safari_ios": "mirror",
               "samsunginternet_android": "mirror",
               "webview_android": "mirror",
@@ -105,95 +112,35 @@
             "spec_url": "https://drafts.csswg.org/css-anchor-position-1/#valdef-position-visibility-anchor-visible",
             "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": "27"
-              },
-              "safari_ios": "mirror",
-              "samsunginternet_android": "mirror",
-              "webview_android": "mirror",
-              "webview_ios": "mirror"
-            },
-            "status": {
-              "experimental": true,
-              "standard_track": true,
-              "deprecated": false
-            }
-          }
-        },
-        "anchors-valid": {
-          "__compat": {
-            "spec_url": "https://drafts.csswg.org/css-anchor-position-1/#valdef-position-visibility-anchor-valid",
-            "tags": [
-              "web-features:anchor-positioning"
-            ],
-            "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": "26.2"
-              },
-              "safari_ios": "mirror",
-              "samsunginternet_android": "mirror",
-              "webview_android": "mirror",
-              "webview_ios": "mirror"
-            },
-            "status": {
-              "experimental": false,
-              "standard_track": true,
-              "deprecated": false
-            }
-          }
-        },
-        "anchors-visible": {
-          "__compat": {
-            "spec_url": "https://drafts.csswg.org/css-anchor-position-1/#valdef-position-visibility-anchor-visible",
-            "tags": [
-              "web-features:anchor-positioning"
-            ],
-            "support": {
-              "chrome": {
+                "alternative_name": "anchors-visible",
                 "version_added": "125"
               },
               "chrome_android": "mirror",
               "edge": "mirror",
               "firefox": {
+                "alternative_name": "anchors-visible",
                 "version_added": "147"
               },
               "firefox_android": "mirror",
               "oculus": "mirror",
               "opera": "mirror",
               "opera_android": "mirror",
-              "safari": {
-                "version_added": "26.2"
-              },
+              "safari": [
+                {
+                  "version_added": "27"
+                },
+                {
+                  "alternative_name": "anchors-visible",
+                  "version_added": "26.2"
+                }
+              ],
               "safari_ios": "mirror",
               "samsunginternet_android": "mirror",
               "webview_android": "mirror",
               "webview_ios": "mirror"
             },
             "status": {
-              "experimental": false,
+              "experimental": true,
               "standard_track": true,
               "deprecated": false
             }