Split custom elements into two features

features/autonomous-custom-elements.dist.yml

@@ -0,0 +1,26 @@
+# Generated from: autonomous-custom-elements.yml
+# Do not edit this file by hand. Edit the source file instead!
+
+name: Autonomous custom elements
+description: Autonomous custom elements are HTML elements with a hyphenated tag name (like `<example-element>`) that have behaviors you define.
+spec: https://html.spec.whatwg.org/multipage/custom-elements.html#autonomous-custom-element
+group: custom-elements
+status:
+  baseline: high
+  baseline_low_date: 2020-01-15
+  baseline_high_date: 2022-07-15
+  support:
+    chrome: "54"
+    chrome_android: "54"
+    edge: "79"
+    firefox: "63"
+    firefox_android: "63"
+    safari: "10.1"
+    safari_ios: "10.3"
+# Note that https://caniuse.com/custom-elementsv1 covers both autonomous custom
+# elements and customized built-in elements, so it is not linked here.
+compat_features:
+  - api.CustomElementRegistry
+  - api.CustomElementRegistry.define
+  - api.Window.customElements
+  - css.selectors.defined

features/autonomous-custom-elements.yml

@@ -0,0 +1,11 @@
+name: Autonomous custom elements
+description: Autonomous custom elements are HTML elements with a hyphenated tag name (like `<example-element>`) that have behaviors you define.
+spec: https://html.spec.whatwg.org/multipage/custom-elements.html#autonomous-custom-element
+group: custom-elements
+# Note that https://caniuse.com/custom-elementsv1 covers both autonomous custom
+# elements and customized built-in elements, so it is not linked here.
+compat_features:
+  - api.CustomElementRegistry
+  - api.CustomElementRegistry.define
+  - api.Window.customElements
+  - css.selectors.defined

features/customized-built-in-elements.dist.yml

@@ -0,0 +1,20 @@
+# Generated from: customized-built-in-elements.yml
+# Do not edit this file by hand. Edit the source file instead!
+
+name: Customized built-in elements
+description: Customized built-in elements are HTML elements that extend built-in elements using the `is` attribute, to add new behaviors that you define.
+spec: https://html.spec.whatwg.org/multipage/custom-elements.html#customized-built-in-element
+group: custom-elements
+status:
+  baseline: false
+  support:
+    chrome: "67"
+    chrome_android: "67"
+    edge: "79"
+    firefox: "63"
+    firefox_android: "63"
+# Note that https://caniuse.com/custom-elementsv1 covers both autonomous custom
+# elements and customized built-in elements, so it is not linked here.
+compat_features:
+  - api.CustomElementRegistry.builtin_element_support
+  - html.global_attributes.is

features/customized-built-in-elements.yml

@@ -0,0 +1,9 @@
+name: Customized built-in elements
+description: Customized built-in elements are HTML elements that extend built-in elements using the `is` attribute, to add new behaviors that you define.
+spec: https://html.spec.whatwg.org/multipage/custom-elements.html#customized-built-in-element
+group: custom-elements
+# Note that https://caniuse.com/custom-elementsv1 covers both autonomous custom
+# elements and customized built-in elements, so it is not linked here.
+compat_features:
+  - api.CustomElementRegistry.builtin_element_support
+  - html.global_attributes.is

groups/custom-elements.yml

@@ -0,0 +1,3 @@
+# https://html.spec.whatwg.org/multipage/custom-elements.html
+name: Custom elements
+parent: html