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ExtendableMessageEvent

The ExtendableMessageEvent interface of the ServiceWorker API represents the event object of a message event fired on a service worker (when a channel message is received on the ServiceWorkerGlobalScope from another context) — extends the lifetime of such events.
API Experimental ExtendableMessageEvent Interface Reference Service Workers

GlobalEventHandlers.onselectstart

The GlobalEventHandlers.onselectstart property represents the event handler that is called when a selectstart event reaches this object.
API Event Handler Experimental GlobalEventHandlers Property Reference

HTMLAnchorElement.referrerPolicy

The HTMLAnchorElement.referrerPolicy property reflect the HTML referrerpolicy attribute of the <a> element defining which referrer is sent when fetching the resource.
API Experimental HTMLAnchorElement Property Reference Referrer Policy

HTMLAreaElement.referrerPolicy

The HTMLAreaElement.referrerPolicy property reflect the HTML referrerpolicy attribute of the <area> element defining which referrer is sent when fetching the resource.
API Experimental HTMLAreaElement Property Reference Referrer Policy

HTMLCanvasElement.captureStream()

The HTMLCanvasElement.captureStream() method returns a CanvasCaptureMediaStream that is a real-time video capture of the surface of the canvas.
Experimental HTMLCanvasElement Media Stream Method Reference Web

HTMLCanvasElement.transferControlToOffscreen()

The HTMLCanvasElement.transferControlToOffscreen() method transfers control to an OffscreenCanvas object, either on the main thread or on a worker.
API Experimental HTMLCanvasElement Method OffscreenCanvas Reference

HTMLHyperlinkElementUtils.hash

The HTMLHyperlinkElementUtils.hash property returns a DOMString containing a '#' followed by the fragment identifier of the URL. The fragment is not percent-decoded.
API Experimental HTMLHyperlinkElementUtils Property URL API