Add various new features (web-platform-dx#563)

Author: foolip

feature-group-definitions/aborting.yml

@@ -0,0 +1,11 @@
+name: AbortController and AbortSignal
+spec: https://dom.spec.whatwg.org/#aborting-ongoing-activities
+caniuse: abortcontroller
+compat_features:
+  - api.AbortController
+  - api.AbortController.AbortController
+  - api.AbortController.abort
+  - api.AbortController.signal
+  - api.AbortSignal
+  - api.AbortSignal.abort_event
+  - api.AbortSignal.aborted

feature-group-definitions/backdrop-filter.yml

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+name: backdrop-filter
+spec: https://drafts.fxtf.org/filter-effects-2/#BackdropFilterProperty
+caniuse: css-backdrop-filter
+compat_features:
+  - css.properties.backdrop-filter

feature-group-definitions/check-visibility.yml

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+name: checkVisibility()
+spec: https://drafts.csswg.org/cssom-view-1/#dom-element-checkvisibility
+compat_features:
+  - api.Element.checkVisibility
+  - api.Element.checkVisibility.options_checkOpacity_parameter
+  - api.Element.checkVisibility.options_checkVisibilityCSS_parameter

feature-group-definitions/details-name.yml

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+name: Mutually exclusive <details> elements
+spec: https://html.spec.whatwg.org/multipage/interactive-elements.html#attr-details-name
+compat_features:
+  - api.HTMLDetailsElement.name
+  - html.elements.details.name

feature-group-definitions/details.yml

@@ -0,0 +1,8 @@
+name: <details>
+spec: https://html.spec.whatwg.org/multipage/interactive-elements.html#the-details-element
+compat_features:
+  - api.HTMLDetailsElement
+  - api.HTMLDetailsElement.open
+  - api.HTMLDetailsElement.toggle_event
+  - html.elements.details
+  - html.elements.details.open

feature-group-definitions/starting-style.yml

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+name: "@starting-style"
+spec: https://drafts.csswg.org/css-transitions-2/#defining-before-change-style
+compat_features:
+  - api.CSSStartingStyleRule
+  - css.at-rules.starting-style

feature-group-definitions/user-pseudos.yml

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+name: ":user-valid and :user-invalid"
+spec: https://drafts.csswg.org/selectors-4/#user-pseudos
+compat_features:
+  - css.selectors.user-invalid
+  - css.selectors.user-valid