The @openwebdocs BCD collector v10.10.7 found new features shipping in Safari 18 beta (20619.1.15.11.1) which was made available for beta testing this week. Currently, the collector covers about 90% of BCD, so the following list might not be exhaustive. Also, if a feature is in Safari TP and/or behind flags, it is not considered here.

With this PR, BCD considers the following 64 features as shipping in Safari 18:

• api.ContentVisibilityAutoStateChangeEvent
• api.ContentVisibilityAutoStateChangeEvent.ContentVisibilityAutoStateChangeEvent
• api.ContentVisibilityAutoStateChangeEvent.skipped
• api.Document.startViewTransition
• api.Element.ariaBrailleLabel
• api.Element.ariaBrailleRoleDescription
• api.Element.getHTML
• api.ElementInternals.ariaBrailleLabel
• api.ElementInternals.ariaBrailleRoleDescription
• api.GeolocationCoordinates.toJSON
• api.GeolocationPosition.toJSON
• api.HTMLCanvasElement.getContext.2d_context.options_willReadFrequently_parameter
• api.HTMLTemplateElement.shadowRootClonable
• api.HTMLTemplateElement.shadowRootDelegatesFocus
• api.HTMLTemplateElement.shadowRootSerializable
• api.MediaSource.canConstructInDedicatedWorker_static
• api.MediaSource.handle
• api.MediaSourceHandle
• api.MediaStreamTrackProcessor
• api.MediaStreamTrackProcessor.MediaStreamTrackProcessor
• api.MediaStreamTrackProcessor.readable
• api.OffscreenCanvasRenderingContext2D.commit (removal)
• api.PopStateEvent.hasUAVisualTransition
• api.SVGAnimateColorElement (removal)
• api.ShadowRoot.getHTML
• api.ShadowRoot.serializable
• api.URL.parse_static
• api.VideoTrackGenerator
• api.VideoTrackGenerator.VideoTrackGenerator
• api.VideoTrackGenerator.muted
• api.VideoTrackGenerator.track
• api.VideoTrackGenerator.writable
• api.ViewTransition
• api.ViewTransition.finished
• api.ViewTransition.ready
• api.ViewTransition.skipTransition
• api.ViewTransition.updateCallbackDone
• css.at-rules.container.style_queries_for_custom_properties
• css.properties.align-content.flex_context.safe_unsafe
• css.properties.align-items.flex_context.safe_unsafe
• css.properties.align-self.flex_context.safe_unsafe
• css.properties.alt (removal)
• css.properties.alt (-webkit- prefix) (removal)
• css.properties.backdrop-filter
• css.properties.content-visibility
• css.properties.content-visibility.auto
• css.properties.content-visibility.hidden
• css.properties.content-visibility.is_transitionable
• css.properties.content-visibility.keyframe_animatable
• css.properties.content-visibility.visible
• css.properties.d
• css.properties.display.is_transitionable
• css.properties.display.keyframe_animatable
• css.properties.justify-content.flex_context.safe_unsafe
• css.properties.offset-path.basic_shape
• css.properties.offset-path.coord_box
• css.properties.view-transition-name
• css.properties.view-transition-name.none
• css.selectors.view-transition-group
• css.selectors.view-transition-image-pair
• css.selectors.view-transition-new
• css.selectors.view-transition-old
• css.selectors.view-transition
• html.elements.script.type.importmap.integrity

See also https://developer.apple.com/documentation/safari-release-notes/safari-18-release-notes

I will run the collector again once there is a new beta for Safari 18, or if we see a final Safari 18 release.

cc @jdatapple @jensimmons