Duplicate is_transitionable features to transition-behavior (#27922)

* Duplicate `is_transitionable` subfeatures into `transition-behavior`

* Add Firefox bug for transitioning `display`

* Rename {transitions => transitionable} subfeatures

Co-authored-by: Daniel D. Beck <[email protected]>
Co-authored-by: Florian Scholz <[email protected]>

---------

Co-authored-by: Daniel D. Beck <[email protected]>
Co-authored-by: Florian Scholz <[email protected]>

Author: 3 people

css/properties/display.json

@@ -619,7 +619,8 @@
               "chrome_android": "mirror",
               "edge": "mirror",
               "firefox": {
-                "version_added": false
+                "version_added": false,
+                "impl_url": "https://bugzil.la/1882408"
               },
               "firefox_android": "mirror",
               "oculus": "mirror",

css/properties/transition-behavior.json

@@ -34,6 +34,77 @@
             "standard_track": true,
             "deprecated": false
           }
+        },
+        "transitionable_content-visibility": {
+          "__compat": {
+            "description": "Transitions `content-visibility` property when set to `allow-discrete`",
+            "spec_url": "https://drafts.csswg.org/css-contain/#content-visibility-animation",
+            "tags": [
+              "web-features:display-animation"
+            ],
+            "support": {
+              "chrome": {
+                "version_added": "117"
+              },
+              "chrome_android": "mirror",
+              "edge": "mirror",
+              "firefox": {
+                "version_added": false
+              },
+              "firefox_android": "mirror",
+              "oculus": "mirror",
+              "opera": "mirror",
+              "opera_android": "mirror",
+              "safari": {
+                "version_added": "18"
+              },
+              "safari_ios": "mirror",
+              "samsunginternet_android": "mirror",
+              "webview_android": "mirror",
+              "webview_ios": "mirror"
+            },
+            "status": {
+              "experimental": false,
+              "standard_track": true,
+              "deprecated": false
+            }
+          }
+        },
+        "transitionable_display": {
+          "__compat": {
+            "description": "Transitions `display` property when set to `allow-discrete`",
+            "spec_url": "https://drafts.csswg.org/css-display-4/#display-animation",
+            "tags": [
+              "web-features:display-animation"
+            ],
+            "support": {
+              "chrome": {
+                "version_added": "117"
+              },
+              "chrome_android": "mirror",
+              "edge": "mirror",
+              "firefox": {
+                "version_added": false,
+                "impl_url": "https://bugzil.la/1882408"
+              },
+              "firefox_android": "mirror",
+              "oculus": "mirror",
+              "opera": "mirror",
+              "opera_android": "mirror",
+              "safari": {
+                "version_added": "18"
+              },
+              "safari_ios": "mirror",
+              "samsunginternet_android": "mirror",
+              "webview_android": "mirror",
+              "webview_ios": "mirror"
+            },
+            "status": {
+              "experimental": false,
+              "standard_track": true,
+              "deprecated": false
+            }
+          }
         }
       }
     }