diff --git a/api-reports/2_12.txt b/api-reports/2_12.txt
index 40a4c3f26..33085d86c 100644
--- a/api-reports/2_12.txt
+++ b/api-reports/2_12.txt
@@ -577,6 +577,22 @@ experimental/intl/NumberFormatOptions[JT] val minimumSignificantDigits: js.Undef
 experimental/intl/NumberFormatOptions[JT] val style: js.UndefOr[String]
 experimental/intl/NumberFormatOptions[JT] val useGrouping: js.UndefOr[Boolean]
 experimental/intl/NumberFormatOptions[SO] def apply(localeMatcher: js.UndefOr[String] = js.undefined, style: js.UndefOr[String] = js.undefined, currency: js.UndefOr[String] = js.undefined, currencyDisplay: js.UndefOr[String] = js.undefined, useGrouping: js.UndefOr[Boolean] = js.undefined, minimumIntegerDigits: js.UndefOr[Double] = js.undefined, minimumFractionDigits: js.UndefOr[Double] = js.undefined, maximumFractionDigits: js.UndefOr[Double] = js.undefined, minimumSignificantDigits: js.UndefOr[Double] = js.undefined, maximumSignificantDigits: js.UndefOr[Double] = js.undefined): NumberFormatOptions
+experimental/mediastream/AudioTrack[JT] var enabled: Boolean
+experimental/mediastream/AudioTrack[JT] val id: String
+experimental/mediastream/AudioTrack[JT] val kind: String
+experimental/mediastream/AudioTrack[JT] val label: String
+experimental/mediastream/AudioTrack[JT] val language: String
+experimental/mediastream/AudioTrackList[JT] def addEventListener[T <: Event](`type`: String, listener: js.Function1[T, _], options: EventListenerOptions): Unit
+experimental/mediastream/AudioTrackList[JT] def addEventListener[T <: Event](`type`: String, listener: js.Function1[T, _], useCapture: Boolean?): Unit
+experimental/mediastream/AudioTrackList[JT] @JSBracketAccess def apply(index: Double): AudioTrack
+experimental/mediastream/AudioTrackList[JT] def dispatchEvent(evt: Event): Boolean
+experimental/mediastream/AudioTrackList[JT] def getTrackById(id: String): AudioTrack
+experimental/mediastream/AudioTrackList[JT] def length: Double
+experimental/mediastream/AudioTrackList[JT] var onaddtrack: js.Function1[Event, Any]
+experimental/mediastream/AudioTrackList[JT] var onchange: js.Function1[Event, Any]
+experimental/mediastream/AudioTrackList[JT] var onremovetrack: js.Function1[Event, Any]
+experimental/mediastream/AudioTrackList[JT] def removeEventListener[T <: Event](`type`: String, listener: js.Function1[T, _], options: EventListenerOptions): Unit
+experimental/mediastream/AudioTrackList[JT] def removeEventListener[T <: Event](`type`: String, listener: js.Function1[T, _], useCapture: Boolean?): Unit
 experimental/mediastream/MediaDeviceInfo[JT] val deviceId: String
 experimental/mediastream/MediaDeviceInfo[JT] val groupId: String
 experimental/mediastream/MediaDeviceInfo[JT] val kind: MediaDeviceKind
@@ -595,6 +611,24 @@ experimental/mediastream/MediaDevices[JT] def getUserMedia(constraints: MediaStr
 experimental/mediastream/MediaDevices[JT] var ondevicechange: js.Function1[Event, Any]
 experimental/mediastream/MediaDevices[JT] def removeEventListener[T <: Event](`type`: String, listener: js.Function1[T, _], options: EventListenerOptions): Unit
 experimental/mediastream/MediaDevices[JT] def removeEventListener[T <: Event](`type`: String, listener: js.Function1[T, _], useCapture: Boolean?): Unit
+experimental/mediastream/MediaSource[JC] def activeSourceBuffers: SourceBufferList
+experimental/mediastream/MediaSource[JC] def addEventListener[T <: Event](`type`: String, listener: js.Function1[T, _], options: EventListenerOptions): Unit
+experimental/mediastream/MediaSource[JC] def addEventListener[T <: Event](`type`: String, listener: js.Function1[T, _], useCapture: Boolean?): Unit
+experimental/mediastream/MediaSource[JC] def addSourceBuffer(mimeType: String): SourceBuffer
+experimental/mediastream/MediaSource[JC] def clearLiveSeekableRange(): Unit
+experimental/mediastream/MediaSource[JC] def dispatchEvent(evt: Event): Boolean
+experimental/mediastream/MediaSource[JC] var duration: Double
+experimental/mediastream/MediaSource[JC] def endOfStream(error: EndOfStreamError?): Unit
+experimental/mediastream/MediaSource[JC] var onsourceclose: js.Function1[Event, Any]
+experimental/mediastream/MediaSource[JC] var onsourceended: js.Function1[Event, Any]
+experimental/mediastream/MediaSource[JC] var onsourceopen: js.Function1[Event, Any]
+experimental/mediastream/MediaSource[JC] def readyState: ReadyState
+experimental/mediastream/MediaSource[JC] def removeEventListener[T <: Event](`type`: String, listener: js.Function1[T, _], options: EventListenerOptions): Unit
+experimental/mediastream/MediaSource[JC] def removeEventListener[T <: Event](`type`: String, listener: js.Function1[T, _], useCapture: Boolean?): Unit
+experimental/mediastream/MediaSource[JC] def removeSourceBuffer(sourceBuffer: SourceBuffer): Unit
+experimental/mediastream/MediaSource[JC] def setLiveSeekableRange(start: Double, end: Double): Unit
+experimental/mediastream/MediaSource[JC] def sourceBuffers: SourceBufferList
+experimental/mediastream/MediaSource[JO] def isTypeSupported(mediaType: String): Boolean
 experimental/mediastream/MediaStream[JC] val active: Boolean
 experimental/mediastream/MediaStream[JC] def addEventListener[T <: Event](`type`: String, listener: js.Function1[T, _], options: EventListenerOptions): Unit
 experimental/mediastream/MediaStream[JC] def addEventListener[T <: Event](`type`: String, listener: js.Function1[T, _], useCapture: Boolean?): Unit
@@ -713,6 +747,101 @@ experimental/mediastream/MediaTrackSupportedConstraints[JT] var sampleRate: js.U
 experimental/mediastream/MediaTrackSupportedConstraints[JT] var sampleSize: js.UndefOr[Boolean]
 experimental/mediastream/MediaTrackSupportedConstraints[JT] var volume: js.UndefOr[Boolean]
 experimental/mediastream/MediaTrackSupportedConstraints[JT] var width: js.UndefOr[Boolean]
+experimental/mediastream/SourceBuffer[JT] def abort(): Unit
+experimental/mediastream/SourceBuffer[JT] def addEventListener[T <: Event](`type`: String, listener: js.Function1[T, _], options: EventListenerOptions): Unit
+experimental/mediastream/SourceBuffer[JT] def addEventListener[T <: Event](`type`: String, listener: js.Function1[T, _], useCapture: Boolean?): Unit
+experimental/mediastream/SourceBuffer[JT] def appendBuffer(data: BufferSource): Unit
+experimental/mediastream/SourceBuffer[JT] var appendWindowEnd: Double
+experimental/mediastream/SourceBuffer[JT] var appendWindowStart: Double
+experimental/mediastream/SourceBuffer[JT] def audioTracks: AudioTrackList
+experimental/mediastream/SourceBuffer[JT] def buffered: TimeRanges
+experimental/mediastream/SourceBuffer[JT] def dispatchEvent(evt: Event): Boolean
+experimental/mediastream/SourceBuffer[JT] var mode: AppendMode
+experimental/mediastream/SourceBuffer[JT] var onabort: js.Function1[Event, Any]
+experimental/mediastream/SourceBuffer[JT] var onerror: js.Function1[Event, Any]
+experimental/mediastream/SourceBuffer[JT] var onupdate: js.Function1[Event, Any]
+experimental/mediastream/SourceBuffer[JT] var onupdateend: js.Function1[Event, Any]
+experimental/mediastream/SourceBuffer[JT] var onupdatestart: js.Function1[Event, Any]
+experimental/mediastream/SourceBuffer[JT] def remove(start: Double, end: Double): Unit
+experimental/mediastream/SourceBuffer[JT] def removeEventListener[T <: Event](`type`: String, listener: js.Function1[T, _], options: EventListenerOptions): Unit
+experimental/mediastream/SourceBuffer[JT] def removeEventListener[T <: Event](`type`: String, listener: js.Function1[T, _], useCapture: Boolean?): Unit
+experimental/mediastream/SourceBuffer[JT] def textTracks: TextTrackList
+experimental/mediastream/SourceBuffer[JT] var timestampOffset: Double
+experimental/mediastream/SourceBuffer[JT] def updating: Boolean
+experimental/mediastream/SourceBuffer[JT] def videoTracks: VideoTrackList
+experimental/mediastream/SourceBufferList[JT] def addEventListener[T <: Event](`type`: String, listener: js.Function1[T, _], options: EventListenerOptions): Unit
+experimental/mediastream/SourceBufferList[JT] def addEventListener[T <: Event](`type`: String, listener: js.Function1[T, _], useCapture: Boolean?): Unit
+experimental/mediastream/SourceBufferList[JT] @JSBracketAccess def apply(index: Double): SourceBuffer
+experimental/mediastream/SourceBufferList[JT] def dispatchEvent(evt: Event): Boolean
+experimental/mediastream/SourceBufferList[JT] def length: Double
+experimental/mediastream/SourceBufferList[JT] var onaddsourcebuffer: js.Function1[Event, Any]
+experimental/mediastream/SourceBufferList[JT] var onremovesourcebuffer: js.Function1[Event, Any]
+experimental/mediastream/SourceBufferList[JT] def removeEventListener[T <: Event](`type`: String, listener: js.Function1[T, _], options: EventListenerOptions): Unit
+experimental/mediastream/SourceBufferList[JT] def removeEventListener[T <: Event](`type`: String, listener: js.Function1[T, _], useCapture: Boolean?): Unit
+experimental/mediastream/TextTrack[JT] def activeCues: TextTrackCueList
+experimental/mediastream/TextTrack[JT] def addCue(cue: TextTrackCue): Unit
+experimental/mediastream/TextTrack[JT] def addEventListener[T <: Event](`type`: String, listener: js.Function1[T, _], options: EventListenerOptions): Unit
+experimental/mediastream/TextTrack[JT] def addEventListener[T <: Event](`type`: String, listener: js.Function1[T, _], useCapture: Boolean?): Unit
+experimental/mediastream/TextTrack[JT] def cues: TextTrackCueList
+experimental/mediastream/TextTrack[JT] def dispatchEvent(evt: Event): Boolean
+experimental/mediastream/TextTrack[JT] val id: String
+experimental/mediastream/TextTrack[JT] val inBandMetadataTrackDispatchType: String
+experimental/mediastream/TextTrack[JT] val kind: String
+experimental/mediastream/TextTrack[JT] val label: String
+experimental/mediastream/TextTrack[JT] val language: String
+experimental/mediastream/TextTrack[JT] var mode: TextTrackMode
+experimental/mediastream/TextTrack[JT] var oncuechange: js.Function1[Event, Any]
+experimental/mediastream/TextTrack[JT] def removeCue(cue: TextTrackCue): Unit
+experimental/mediastream/TextTrack[JT] def removeEventListener[T <: Event](`type`: String, listener: js.Function1[T, _], options: EventListenerOptions): Unit
+experimental/mediastream/TextTrack[JT] def removeEventListener[T <: Event](`type`: String, listener: js.Function1[T, _], useCapture: Boolean?): Unit
+experimental/mediastream/TextTrackCue[JT] def addEventListener[T <: Event](`type`: String, listener: js.Function1[T, _], options: EventListenerOptions): Unit
+experimental/mediastream/TextTrackCue[JT] def addEventListener[T <: Event](`type`: String, listener: js.Function1[T, _], useCapture: Boolean?): Unit
+experimental/mediastream/TextTrackCue[JT] def dispatchEvent(evt: Event): Boolean
+experimental/mediastream/TextTrackCue[JT] var endTime: Double
+experimental/mediastream/TextTrackCue[JT] var id: String
+experimental/mediastream/TextTrackCue[JT] var onenter: js.Function1[Event, Any]
+experimental/mediastream/TextTrackCue[JT] var onexit: js.Function1[Event, Any]
+experimental/mediastream/TextTrackCue[JT] var pauseOnExit: Boolean
+experimental/mediastream/TextTrackCue[JT] def removeEventListener[T <: Event](`type`: String, listener: js.Function1[T, _], options: EventListenerOptions): Unit
+experimental/mediastream/TextTrackCue[JT] def removeEventListener[T <: Event](`type`: String, listener: js.Function1[T, _], useCapture: Boolean?): Unit
+experimental/mediastream/TextTrackCue[JT] var startTime: Double
+experimental/mediastream/TextTrackCue[JT] def track: TextTrack
+experimental/mediastream/TextTrackCueList[JT] @JSBracketAccess def apply(index: Double): TextTrackCue
+experimental/mediastream/TextTrackCueList[JT] def getCueById(id: String): TextTrackCue
+experimental/mediastream/TextTrackCueList[JT] def length: Double
+experimental/mediastream/TextTrackList[JT] def addEventListener[T <: Event](`type`: String, listener: js.Function1[T, _], options: EventListenerOptions): Unit
+experimental/mediastream/TextTrackList[JT] def addEventListener[T <: Event](`type`: String, listener: js.Function1[T, _], useCapture: Boolean?): Unit
+experimental/mediastream/TextTrackList[JT] @JSBracketAccess def apply(index: Double): VideoTrack
+experimental/mediastream/TextTrackList[JT] def dispatchEvent(evt: Event): Boolean
+experimental/mediastream/TextTrackList[JT] def getTrackById(id: String): TextTrack
+experimental/mediastream/TextTrackList[JT] def length: Double
+experimental/mediastream/TextTrackList[JT] var onaddtrack: js.Function1[Event, Any]
+experimental/mediastream/TextTrackList[JT] var onchange: js.Function1[Event, Any]
+experimental/mediastream/TextTrackList[JT] var onremovetrack: js.Function1[Event, Any]
+experimental/mediastream/TextTrackList[JT] def removeEventListener[T <: Event](`type`: String, listener: js.Function1[T, _], options: EventListenerOptions): Unit
+experimental/mediastream/TextTrackList[JT] def removeEventListener[T <: Event](`type`: String, listener: js.Function1[T, _], useCapture: Boolean?): Unit
+experimental/mediastream/VideoTrack[JT] val id: String
+experimental/mediastream/VideoTrack[JT] val kind: String
+experimental/mediastream/VideoTrack[JT] val label: String
+experimental/mediastream/VideoTrack[JT] val language: String
+experimental/mediastream/VideoTrack[JT] var selected: Boolean
+experimental/mediastream/VideoTrackList[JT] def addEventListener[T <: Event](`type`: String, listener: js.Function1[T, _], options: EventListenerOptions): Unit
+experimental/mediastream/VideoTrackList[JT] def addEventListener[T <: Event](`type`: String, listener: js.Function1[T, _], useCapture: Boolean?): Unit
+experimental/mediastream/VideoTrackList[JT] @JSBracketAccess def apply(index: Double): VideoTrack
+experimental/mediastream/VideoTrackList[JT] def dispatchEvent(evt: Event): Boolean
+experimental/mediastream/VideoTrackList[JT] def getTrackById(id: String): VideoTrack
+experimental/mediastream/VideoTrackList[JT] def length: Double
+experimental/mediastream/VideoTrackList[JT] var onaddtrack: js.Function1[Event, Any]
+experimental/mediastream/VideoTrackList[JT] var onchange: js.Function1[Event, Any]
+experimental/mediastream/VideoTrackList[JT] var onremovetrack: js.Function1[Event, Any]
+experimental/mediastream/VideoTrackList[JT] def removeEventListener[T <: Event](`type`: String, listener: js.Function1[T, _], options: EventListenerOptions): Unit
+experimental/mediastream/VideoTrackList[JT] def removeEventListener[T <: Event](`type`: String, listener: js.Function1[T, _], useCapture: Boolean?): Unit
+experimental/mediastream/VideoTrackList[JT] def selectedIndex: Double
+experimental/mediastream/package[SO] type AppendMode = String
+experimental/mediastream/package[SO] type BufferSource = js.typedarray.ArrayBufferView | js.typedarray.ArrayBuffer
+experimental/mediastream/package[SO] type EndOfStreamError = String
+experimental/mediastream/package[SO] type ReadyState = String
+experimental/mediastream/package[SO] type TextTrackMode = String
 experimental/package[SO] type BodyInit = Blob | BufferSource | FormData | String
 experimental/package[SO] type ByteString = String
 experimental/package[SO] type HeadersInit = Headers | Sequence[Sequence[ByteString]] | OpenEndedDictionary[ByteString]
@@ -2355,10 +2484,10 @@ raw/AudioParam[JT] def setValueAtTime(value: Double, startTime: Double): Unit
 raw/AudioParam[JT] def setValueCurveAtTime(values: js.typedarray.Float32Array, startTime: Double, duration: Double): Unit
 raw/AudioParam[JT] var value: Double
 raw/AudioTrack[JT] var enabled: Boolean
-raw/AudioTrack[JT] var id: String
-raw/AudioTrack[JT] var kind: String
-raw/AudioTrack[JT] var label: String
-raw/AudioTrack[JT] var language: String
+raw/AudioTrack[JT] val id: String
+raw/AudioTrack[JT] val kind: String
+raw/AudioTrack[JT] val label: String
+raw/AudioTrack[JT] val language: String
 raw/AudioTrackList[JT] def addEventListener[T <: Event](`type`: String, listener: js.Function1[T, _], options: EventListenerOptions): Unit
 raw/AudioTrackList[JT] def addEventListener[T <: Event](`type`: String, listener: js.Function1[T, _], useCapture: Boolean?): Unit
 raw/AudioTrackList[JT] @scala.scalajs.js.annotation.JSBracketAccess def apply(index: Int): T
@@ -4320,6 +4449,7 @@ raw/HTMLAudioElement[JC] def setAttributeNode(newAttr: Attr): Attr
 raw/HTMLAudioElement[JC] def setAttributeNodeNS(newAttr: Attr): Attr
 raw/HTMLAudioElement[JC] var spellcheck: Boolean
 raw/HTMLAudioElement[JC] var src: String
+raw/HTMLAudioElement[JC] var srcObject: js.UndefOr[MediaStream | MediaSource | Blob]
 raw/HTMLAudioElement[JC] def style: CSSStyleDeclaration
 raw/HTMLAudioElement[JC] def style_ = (value: CSSStyleDeclaration): Unit
 raw/HTMLAudioElement[JC] def style_ = (value: String): Unit
@@ -9343,6 +9473,7 @@ raw/HTMLMediaElement[JC] def setAttributeNode(newAttr: Attr): Attr
 raw/HTMLMediaElement[JC] def setAttributeNodeNS(newAttr: Attr): Attr
 raw/HTMLMediaElement[JC] var spellcheck: Boolean
 raw/HTMLMediaElement[JC] var src: String
+raw/HTMLMediaElement[JC] var srcObject: js.UndefOr[MediaStream | MediaSource | Blob]
 raw/HTMLMediaElement[JC] def style: CSSStyleDeclaration
 raw/HTMLMediaElement[JC] def style_ = (value: CSSStyleDeclaration): Unit
 raw/HTMLMediaElement[JC] def style_ = (value: String): Unit
@@ -14923,6 +15054,7 @@ raw/HTMLVideoElement[JC] def setAttributeNode(newAttr: Attr): Attr
 raw/HTMLVideoElement[JC] def setAttributeNodeNS(newAttr: Attr): Attr
 raw/HTMLVideoElement[JC] var spellcheck: Boolean
 raw/HTMLVideoElement[JC] var src: String
+raw/HTMLVideoElement[JC] var srcObject: js.UndefOr[MediaStream | MediaSource | Blob]
 raw/HTMLVideoElement[JC] def style: CSSStyleDeclaration
 raw/HTMLVideoElement[JC] def style_ = (value: CSSStyleDeclaration): Unit
 raw/HTMLVideoElement[JC] def style_ = (value: String): Unit
diff --git a/api-reports/2_13.txt b/api-reports/2_13.txt
index 6ecf9a963..23b3e8b97 100644
--- a/api-reports/2_13.txt
+++ b/api-reports/2_13.txt
@@ -577,6 +577,22 @@ experimental/intl/NumberFormatOptions[JT] val minimumSignificantDigits: js.Undef
 experimental/intl/NumberFormatOptions[JT] val style: js.UndefOr[String]
 experimental/intl/NumberFormatOptions[JT] val useGrouping: js.UndefOr[Boolean]
 experimental/intl/NumberFormatOptions[SO] def apply(localeMatcher: js.UndefOr[String] = js.undefined, style: js.UndefOr[String] = js.undefined, currency: js.UndefOr[String] = js.undefined, currencyDisplay: js.UndefOr[String] = js.undefined, useGrouping: js.UndefOr[Boolean] = js.undefined, minimumIntegerDigits: js.UndefOr[Double] = js.undefined, minimumFractionDigits: js.UndefOr[Double] = js.undefined, maximumFractionDigits: js.UndefOr[Double] = js.undefined, minimumSignificantDigits: js.UndefOr[Double] = js.undefined, maximumSignificantDigits: js.UndefOr[Double] = js.undefined): NumberFormatOptions
+experimental/mediastream/AudioTrack[JT] var enabled: Boolean
+experimental/mediastream/AudioTrack[JT] val id: String
+experimental/mediastream/AudioTrack[JT] val kind: String
+experimental/mediastream/AudioTrack[JT] val label: String
+experimental/mediastream/AudioTrack[JT] val language: String
+experimental/mediastream/AudioTrackList[JT] def addEventListener[T <: Event](`type`: String, listener: js.Function1[T, _], options: EventListenerOptions): Unit
+experimental/mediastream/AudioTrackList[JT] def addEventListener[T <: Event](`type`: String, listener: js.Function1[T, _], useCapture: Boolean?): Unit
+experimental/mediastream/AudioTrackList[JT] @JSBracketAccess def apply(index: Double): AudioTrack
+experimental/mediastream/AudioTrackList[JT] def dispatchEvent(evt: Event): Boolean
+experimental/mediastream/AudioTrackList[JT] def getTrackById(id: String): AudioTrack
+experimental/mediastream/AudioTrackList[JT] def length: Double
+experimental/mediastream/AudioTrackList[JT] var onaddtrack: js.Function1[Event, Any]
+experimental/mediastream/AudioTrackList[JT] var onchange: js.Function1[Event, Any]
+experimental/mediastream/AudioTrackList[JT] var onremovetrack: js.Function1[Event, Any]
+experimental/mediastream/AudioTrackList[JT] def removeEventListener[T <: Event](`type`: String, listener: js.Function1[T, _], options: EventListenerOptions): Unit
+experimental/mediastream/AudioTrackList[JT] def removeEventListener[T <: Event](`type`: String, listener: js.Function1[T, _], useCapture: Boolean?): Unit
 experimental/mediastream/MediaDeviceInfo[JT] val deviceId: String
 experimental/mediastream/MediaDeviceInfo[JT] val groupId: String
 experimental/mediastream/MediaDeviceInfo[JT] val kind: MediaDeviceKind
@@ -595,6 +611,24 @@ experimental/mediastream/MediaDevices[JT] def getUserMedia(constraints: MediaStr
 experimental/mediastream/MediaDevices[JT] var ondevicechange: js.Function1[Event, Any]
 experimental/mediastream/MediaDevices[JT] def removeEventListener[T <: Event](`type`: String, listener: js.Function1[T, _], options: EventListenerOptions): Unit
 experimental/mediastream/MediaDevices[JT] def removeEventListener[T <: Event](`type`: String, listener: js.Function1[T, _], useCapture: Boolean?): Unit
+experimental/mediastream/MediaSource[JC] def activeSourceBuffers: SourceBufferList
+experimental/mediastream/MediaSource[JC] def addEventListener[T <: Event](`type`: String, listener: js.Function1[T, _], options: EventListenerOptions): Unit
+experimental/mediastream/MediaSource[JC] def addEventListener[T <: Event](`type`: String, listener: js.Function1[T, _], useCapture: Boolean?): Unit
+experimental/mediastream/MediaSource[JC] def addSourceBuffer(mimeType: String): SourceBuffer
+experimental/mediastream/MediaSource[JC] def clearLiveSeekableRange(): Unit
+experimental/mediastream/MediaSource[JC] def dispatchEvent(evt: Event): Boolean
+experimental/mediastream/MediaSource[JC] var duration: Double
+experimental/mediastream/MediaSource[JC] def endOfStream(error: EndOfStreamError?): Unit
+experimental/mediastream/MediaSource[JC] var onsourceclose: js.Function1[Event, Any]
+experimental/mediastream/MediaSource[JC] var onsourceended: js.Function1[Event, Any]
+experimental/mediastream/MediaSource[JC] var onsourceopen: js.Function1[Event, Any]
+experimental/mediastream/MediaSource[JC] def readyState: ReadyState
+experimental/mediastream/MediaSource[JC] def removeEventListener[T <: Event](`type`: String, listener: js.Function1[T, _], options: EventListenerOptions): Unit
+experimental/mediastream/MediaSource[JC] def removeEventListener[T <: Event](`type`: String, listener: js.Function1[T, _], useCapture: Boolean?): Unit
+experimental/mediastream/MediaSource[JC] def removeSourceBuffer(sourceBuffer: SourceBuffer): Unit
+experimental/mediastream/MediaSource[JC] def setLiveSeekableRange(start: Double, end: Double): Unit
+experimental/mediastream/MediaSource[JC] def sourceBuffers: SourceBufferList
+experimental/mediastream/MediaSource[JO] def isTypeSupported(mediaType: String): Boolean
 experimental/mediastream/MediaStream[JC] val active: Boolean
 experimental/mediastream/MediaStream[JC] def addEventListener[T <: Event](`type`: String, listener: js.Function1[T, _], options: EventListenerOptions): Unit
 experimental/mediastream/MediaStream[JC] def addEventListener[T <: Event](`type`: String, listener: js.Function1[T, _], useCapture: Boolean?): Unit
@@ -713,6 +747,101 @@ experimental/mediastream/MediaTrackSupportedConstraints[JT] var sampleRate: js.U
 experimental/mediastream/MediaTrackSupportedConstraints[JT] var sampleSize: js.UndefOr[Boolean]
 experimental/mediastream/MediaTrackSupportedConstraints[JT] var volume: js.UndefOr[Boolean]
 experimental/mediastream/MediaTrackSupportedConstraints[JT] var width: js.UndefOr[Boolean]
+experimental/mediastream/SourceBuffer[JT] def abort(): Unit
+experimental/mediastream/SourceBuffer[JT] def addEventListener[T <: Event](`type`: String, listener: js.Function1[T, _], options: EventListenerOptions): Unit
+experimental/mediastream/SourceBuffer[JT] def addEventListener[T <: Event](`type`: String, listener: js.Function1[T, _], useCapture: Boolean?): Unit
+experimental/mediastream/SourceBuffer[JT] def appendBuffer(data: BufferSource): Unit
+experimental/mediastream/SourceBuffer[JT] var appendWindowEnd: Double
+experimental/mediastream/SourceBuffer[JT] var appendWindowStart: Double
+experimental/mediastream/SourceBuffer[JT] def audioTracks: AudioTrackList
+experimental/mediastream/SourceBuffer[JT] def buffered: TimeRanges
+experimental/mediastream/SourceBuffer[JT] def dispatchEvent(evt: Event): Boolean
+experimental/mediastream/SourceBuffer[JT] var mode: AppendMode
+experimental/mediastream/SourceBuffer[JT] var onabort: js.Function1[Event, Any]
+experimental/mediastream/SourceBuffer[JT] var onerror: js.Function1[Event, Any]
+experimental/mediastream/SourceBuffer[JT] var onupdate: js.Function1[Event, Any]
+experimental/mediastream/SourceBuffer[JT] var onupdateend: js.Function1[Event, Any]
+experimental/mediastream/SourceBuffer[JT] var onupdatestart: js.Function1[Event, Any]
+experimental/mediastream/SourceBuffer[JT] def remove(start: Double, end: Double): Unit
+experimental/mediastream/SourceBuffer[JT] def removeEventListener[T <: Event](`type`: String, listener: js.Function1[T, _], options: EventListenerOptions): Unit
+experimental/mediastream/SourceBuffer[JT] def removeEventListener[T <: Event](`type`: String, listener: js.Function1[T, _], useCapture: Boolean?): Unit
+experimental/mediastream/SourceBuffer[JT] def textTracks: TextTrackList
+experimental/mediastream/SourceBuffer[JT] var timestampOffset: Double
+experimental/mediastream/SourceBuffer[JT] def updating: Boolean
+experimental/mediastream/SourceBuffer[JT] def videoTracks: VideoTrackList
+experimental/mediastream/SourceBufferList[JT] def addEventListener[T <: Event](`type`: String, listener: js.Function1[T, _], options: EventListenerOptions): Unit
+experimental/mediastream/SourceBufferList[JT] def addEventListener[T <: Event](`type`: String, listener: js.Function1[T, _], useCapture: Boolean?): Unit
+experimental/mediastream/SourceBufferList[JT] @JSBracketAccess def apply(index: Double): SourceBuffer
+experimental/mediastream/SourceBufferList[JT] def dispatchEvent(evt: Event): Boolean
+experimental/mediastream/SourceBufferList[JT] def length: Double
+experimental/mediastream/SourceBufferList[JT] var onaddsourcebuffer: js.Function1[Event, Any]
+experimental/mediastream/SourceBufferList[JT] var onremovesourcebuffer: js.Function1[Event, Any]
+experimental/mediastream/SourceBufferList[JT] def removeEventListener[T <: Event](`type`: String, listener: js.Function1[T, _], options: EventListenerOptions): Unit
+experimental/mediastream/SourceBufferList[JT] def removeEventListener[T <: Event](`type`: String, listener: js.Function1[T, _], useCapture: Boolean?): Unit
+experimental/mediastream/TextTrack[JT] def activeCues: TextTrackCueList
+experimental/mediastream/TextTrack[JT] def addCue(cue: TextTrackCue): Unit
+experimental/mediastream/TextTrack[JT] def addEventListener[T <: Event](`type`: String, listener: js.Function1[T, _], options: EventListenerOptions): Unit
+experimental/mediastream/TextTrack[JT] def addEventListener[T <: Event](`type`: String, listener: js.Function1[T, _], useCapture: Boolean?): Unit
+experimental/mediastream/TextTrack[JT] def cues: TextTrackCueList
+experimental/mediastream/TextTrack[JT] def dispatchEvent(evt: Event): Boolean
+experimental/mediastream/TextTrack[JT] val id: String
+experimental/mediastream/TextTrack[JT] val inBandMetadataTrackDispatchType: String
+experimental/mediastream/TextTrack[JT] val kind: String
+experimental/mediastream/TextTrack[JT] val label: String
+experimental/mediastream/TextTrack[JT] val language: String
+experimental/mediastream/TextTrack[JT] var mode: TextTrackMode
+experimental/mediastream/TextTrack[JT] var oncuechange: js.Function1[Event, Any]
+experimental/mediastream/TextTrack[JT] def removeCue(cue: TextTrackCue): Unit
+experimental/mediastream/TextTrack[JT] def removeEventListener[T <: Event](`type`: String, listener: js.Function1[T, _], options: EventListenerOptions): Unit
+experimental/mediastream/TextTrack[JT] def removeEventListener[T <: Event](`type`: String, listener: js.Function1[T, _], useCapture: Boolean?): Unit
+experimental/mediastream/TextTrackCue[JT] def addEventListener[T <: Event](`type`: String, listener: js.Function1[T, _], options: EventListenerOptions): Unit
+experimental/mediastream/TextTrackCue[JT] def addEventListener[T <: Event](`type`: String, listener: js.Function1[T, _], useCapture: Boolean?): Unit
+experimental/mediastream/TextTrackCue[JT] def dispatchEvent(evt: Event): Boolean
+experimental/mediastream/TextTrackCue[JT] var endTime: Double
+experimental/mediastream/TextTrackCue[JT] var id: String
+experimental/mediastream/TextTrackCue[JT] var onenter: js.Function1[Event, Any]
+experimental/mediastream/TextTrackCue[JT] var onexit: js.Function1[Event, Any]
+experimental/mediastream/TextTrackCue[JT] var pauseOnExit: Boolean
+experimental/mediastream/TextTrackCue[JT] def removeEventListener[T <: Event](`type`: String, listener: js.Function1[T, _], options: EventListenerOptions): Unit
+experimental/mediastream/TextTrackCue[JT] def removeEventListener[T <: Event](`type`: String, listener: js.Function1[T, _], useCapture: Boolean?): Unit
+experimental/mediastream/TextTrackCue[JT] var startTime: Double
+experimental/mediastream/TextTrackCue[JT] def track: TextTrack
+experimental/mediastream/TextTrackCueList[JT] @JSBracketAccess def apply(index: Double): TextTrackCue
+experimental/mediastream/TextTrackCueList[JT] def getCueById(id: String): TextTrackCue
+experimental/mediastream/TextTrackCueList[JT] def length: Double
+experimental/mediastream/TextTrackList[JT] def addEventListener[T <: Event](`type`: String, listener: js.Function1[T, _], options: EventListenerOptions): Unit
+experimental/mediastream/TextTrackList[JT] def addEventListener[T <: Event](`type`: String, listener: js.Function1[T, _], useCapture: Boolean?): Unit
+experimental/mediastream/TextTrackList[JT] @JSBracketAccess def apply(index: Double): VideoTrack
+experimental/mediastream/TextTrackList[JT] def dispatchEvent(evt: Event): Boolean
+experimental/mediastream/TextTrackList[JT] def getTrackById(id: String): TextTrack
+experimental/mediastream/TextTrackList[JT] def length: Double
+experimental/mediastream/TextTrackList[JT] var onaddtrack: js.Function1[Event, Any]
+experimental/mediastream/TextTrackList[JT] var onchange: js.Function1[Event, Any]
+experimental/mediastream/TextTrackList[JT] var onremovetrack: js.Function1[Event, Any]
+experimental/mediastream/TextTrackList[JT] def removeEventListener[T <: Event](`type`: String, listener: js.Function1[T, _], options: EventListenerOptions): Unit
+experimental/mediastream/TextTrackList[JT] def removeEventListener[T <: Event](`type`: String, listener: js.Function1[T, _], useCapture: Boolean?): Unit
+experimental/mediastream/VideoTrack[JT] val id: String
+experimental/mediastream/VideoTrack[JT] val kind: String
+experimental/mediastream/VideoTrack[JT] val label: String
+experimental/mediastream/VideoTrack[JT] val language: String
+experimental/mediastream/VideoTrack[JT] var selected: Boolean
+experimental/mediastream/VideoTrackList[JT] def addEventListener[T <: Event](`type`: String, listener: js.Function1[T, _], options: EventListenerOptions): Unit
+experimental/mediastream/VideoTrackList[JT] def addEventListener[T <: Event](`type`: String, listener: js.Function1[T, _], useCapture: Boolean?): Unit
+experimental/mediastream/VideoTrackList[JT] @JSBracketAccess def apply(index: Double): VideoTrack
+experimental/mediastream/VideoTrackList[JT] def dispatchEvent(evt: Event): Boolean
+experimental/mediastream/VideoTrackList[JT] def getTrackById(id: String): VideoTrack
+experimental/mediastream/VideoTrackList[JT] def length: Double
+experimental/mediastream/VideoTrackList[JT] var onaddtrack: js.Function1[Event, Any]
+experimental/mediastream/VideoTrackList[JT] var onchange: js.Function1[Event, Any]
+experimental/mediastream/VideoTrackList[JT] var onremovetrack: js.Function1[Event, Any]
+experimental/mediastream/VideoTrackList[JT] def removeEventListener[T <: Event](`type`: String, listener: js.Function1[T, _], options: EventListenerOptions): Unit
+experimental/mediastream/VideoTrackList[JT] def removeEventListener[T <: Event](`type`: String, listener: js.Function1[T, _], useCapture: Boolean?): Unit
+experimental/mediastream/VideoTrackList[JT] def selectedIndex: Double
+experimental/mediastream/package[SO] type AppendMode = String
+experimental/mediastream/package[SO] type BufferSource = js.typedarray.ArrayBufferView | js.typedarray.ArrayBuffer
+experimental/mediastream/package[SO] type EndOfStreamError = String
+experimental/mediastream/package[SO] type ReadyState = String
+experimental/mediastream/package[SO] type TextTrackMode = String
 experimental/package[SO] type BodyInit = Blob | BufferSource | FormData | String
 experimental/package[SO] type ByteString = String
 experimental/package[SO] type HeadersInit = Headers | Sequence[Sequence[ByteString]] | OpenEndedDictionary[ByteString]
@@ -2355,10 +2484,10 @@ raw/AudioParam[JT] def setValueAtTime(value: Double, startTime: Double): Unit
 raw/AudioParam[JT] def setValueCurveAtTime(values: js.typedarray.Float32Array, startTime: Double, duration: Double): Unit
 raw/AudioParam[JT] var value: Double
 raw/AudioTrack[JT] var enabled: Boolean
-raw/AudioTrack[JT] var id: String
-raw/AudioTrack[JT] var kind: String
-raw/AudioTrack[JT] var label: String
-raw/AudioTrack[JT] var language: String
+raw/AudioTrack[JT] val id: String
+raw/AudioTrack[JT] val kind: String
+raw/AudioTrack[JT] val label: String
+raw/AudioTrack[JT] val language: String
 raw/AudioTrackList[JT] def addEventListener[T <: Event](`type`: String, listener: js.Function1[T, _], options: EventListenerOptions): Unit
 raw/AudioTrackList[JT] def addEventListener[T <: Event](`type`: String, listener: js.Function1[T, _], useCapture: Boolean?): Unit
 raw/AudioTrackList[JT] @scala.scalajs.js.annotation.JSBracketAccess def apply(index: Int): T
@@ -4320,6 +4449,7 @@ raw/HTMLAudioElement[JC] def setAttributeNode(newAttr: Attr): Attr
 raw/HTMLAudioElement[JC] def setAttributeNodeNS(newAttr: Attr): Attr
 raw/HTMLAudioElement[JC] var spellcheck: Boolean
 raw/HTMLAudioElement[JC] var src: String
+raw/HTMLAudioElement[JC] var srcObject: js.UndefOr[MediaStream | MediaSource | Blob]
 raw/HTMLAudioElement[JC] def style: CSSStyleDeclaration
 raw/HTMLAudioElement[JC] def style_ = (value: CSSStyleDeclaration): Unit
 raw/HTMLAudioElement[JC] def style_ = (value: String): Unit
@@ -9343,6 +9473,7 @@ raw/HTMLMediaElement[JC] def setAttributeNode(newAttr: Attr): Attr
 raw/HTMLMediaElement[JC] def setAttributeNodeNS(newAttr: Attr): Attr
 raw/HTMLMediaElement[JC] var spellcheck: Boolean
 raw/HTMLMediaElement[JC] var src: String
+raw/HTMLMediaElement[JC] var srcObject: js.UndefOr[MediaStream | MediaSource | Blob]
 raw/HTMLMediaElement[JC] def style: CSSStyleDeclaration
 raw/HTMLMediaElement[JC] def style_ = (value: CSSStyleDeclaration): Unit
 raw/HTMLMediaElement[JC] def style_ = (value: String): Unit
@@ -14923,6 +15054,7 @@ raw/HTMLVideoElement[JC] def setAttributeNode(newAttr: Attr): Attr
 raw/HTMLVideoElement[JC] def setAttributeNodeNS(newAttr: Attr): Attr
 raw/HTMLVideoElement[JC] var spellcheck: Boolean
 raw/HTMLVideoElement[JC] var src: String
+raw/HTMLVideoElement[JC] var srcObject: js.UndefOr[MediaStream | MediaSource | Blob]
 raw/HTMLVideoElement[JC] def style: CSSStyleDeclaration
 raw/HTMLVideoElement[JC] def style_ = (value: CSSStyleDeclaration): Unit
 raw/HTMLVideoElement[JC] def style_ = (value: String): Unit
diff --git a/src/main/scala/org/scalajs/dom/experimental/mediastream/MediaStream.scala b/src/main/scala/org/scalajs/dom/experimental/mediastream/MediaStream.scala
index c8b9ba16f..e67a40536 100644
--- a/src/main/scala/org/scalajs/dom/experimental/mediastream/MediaStream.scala
+++ b/src/main/scala/org/scalajs/dom/experimental/mediastream/MediaStream.scala
@@ -6,7 +6,7 @@ package org.scalajs.dom.experimental.mediastream
 import scala.scalajs.js
 import scala.scalajs.js.|
 import scala.scalajs.js.annotation._
-import org.scalajs.dom.raw.{DOMException, Event, EventInit, EventTarget}
+import org.scalajs.dom.raw.{Event, EventInit, EventTarget, TimeRanges}
 
 /**
  * The MediaStream
@@ -626,3 +626,181 @@ trait MediaTrackSupportedConstraints extends js.Object {
   var deviceId: js.UndefOr[Boolean] = js.undefined
   var groupId: js.UndefOr[Boolean] = js.undefined
 }
+
+/**
+ * Represents a source of media data for an HTMLMediaElement object.
+ *
+ * A MediaSource object can be attached to a HTMLMediaElement to be played in the user agent.
+ */
+@js.native
+@JSGlobal
+class MediaSource extends EventTarget {
+  def sourceBuffers: SourceBufferList = js.native
+  def activeSourceBuffers: SourceBufferList = js.native
+  def readyState: ReadyState = js.native
+
+  /**
+   * Allows the web application to set the presentation duration.
+   *
+   * The duration is initially set to NaN when the MediaSource object is created.
+   */
+  var duration: Double = js.native
+
+  var onsourceopen: js.Function1[Event, Any] = js.native
+  var onsourceended: js.Function1[Event, Any] = js.native
+  var onsourceclose: js.Function1[Event, Any] = js.native
+
+  def addSourceBuffer(mimeType: String): SourceBuffer = js.native
+  def removeSourceBuffer(sourceBuffer: SourceBuffer): Unit = js.native
+  def endOfStream(error: EndOfStreamError = js.native): Unit = js.native
+  def setLiveSeekableRange(start: Double, end: Double): Unit = js.native
+  def clearLiveSeekableRange(): Unit = js.native
+}
+
+@js.native
+@JSGlobalScope
+object MediaSource extends js.Object {
+  def isTypeSupported(mediaType: String): Boolean = js.native
+}
+
+@js.native
+trait SourceBufferList extends EventTarget {
+  def length: Double = js.native
+
+  @JSBracketAccess
+  def apply(index: Double): SourceBuffer = js.native
+
+  var onaddsourcebuffer: js.Function1[Event, Any] = js.native
+  var onremovesourcebuffer: js.Function1[Event, Any] = js.native
+}
+
+@js.native
+trait SourceBuffer extends EventTarget {
+  var mode: AppendMode = js.native
+  var timestampOffset: Double = js.native
+
+  def updating: Boolean = js.native
+  def buffered: TimeRanges = js.native
+
+  def audioTracks: AudioTrackList = js.native
+  def videoTracks: VideoTrackList = js.native
+  def textTracks: TextTrackList = js.native
+
+  var appendWindowStart: Double = js.native
+  var appendWindowEnd: Double = js.native
+
+  var onupdatestart: js.Function1[Event, Any] = js.native
+  var onupdate: js.Function1[Event, Any] = js.native
+  var onupdateend: js.Function1[Event, Any] = js.native
+  var onerror: js.Function1[Event, Any] = js.native
+  var onabort: js.Function1[Event, Any] = js.native
+
+  def appendBuffer(data: BufferSource): Unit = js.native
+  def abort(): Unit = js.native
+  def remove(start: Double, end: Double): Unit = js.native
+}
+
+@js.native
+trait AudioTrackList extends EventTarget {
+  def length: Double = js.native
+
+  @JSBracketAccess
+  def apply(index: Double): AudioTrack = js.native
+
+  def getTrackById(id: String): AudioTrack = js.native
+
+  var onchange: js.Function1[Event, Any] = js.native
+  var onaddtrack: js.Function1[Event, Any] = js.native
+  var onremovetrack: js.Function1[Event, Any] = js.native
+}
+
+@js.native
+trait AudioTrack extends js.Object {
+  val id: String = js.native
+  val kind: String = js.native
+  val label: String = js.native
+  val language: String = js.native
+  var enabled: Boolean = js.native
+}
+
+@js.native
+trait VideoTrackList extends EventTarget {
+  def length: Double = js.native
+
+  @JSBracketAccess
+  def apply(index: Double): VideoTrack = js.native
+
+  def getTrackById(id: String): VideoTrack = js.native
+
+  def selectedIndex: Double = js.native
+
+  var onchange: js.Function1[Event, Any] = js.native
+  var onaddtrack: js.Function1[Event, Any] = js.native
+  var onremovetrack: js.Function1[Event, Any] = js.native
+}
+
+@js.native
+trait VideoTrack extends js.Object {
+  val id: String = js.native
+  val kind: String = js.native
+  val label: String = js.native
+  val language: String = js.native
+  var selected: Boolean = js.native
+}
+
+@js.native
+trait TextTrackList extends EventTarget {
+
+  def length: Double = js.native
+
+  @JSBracketAccess
+  def apply(index: Double): VideoTrack = js.native
+
+  def getTrackById(id: String): TextTrack = js.native
+
+  var onchange: js.Function1[Event, Any] = js.native
+  var onaddtrack: js.Function1[Event, Any] = js.native
+  var onremovetrack: js.Function1[Event, Any] = js.native
+}
+
+@js.native
+trait TextTrack extends EventTarget {
+  val id: String = js.native
+  val kind: String = js.native
+  val label: String = js.native
+  val language: String = js.native
+  val inBandMetadataTrackDispatchType: String = js.native
+
+  var mode: TextTrackMode = js.native
+
+  def cues: TextTrackCueList = js.native
+  def activeCues: TextTrackCueList = js.native
+
+  def addCue(cue: TextTrackCue): Unit = js.native
+  def removeCue(cue: TextTrackCue): Unit = js.native
+
+  var oncuechange: js.Function1[Event, Any] = js.native
+}
+
+@js.native
+trait TextTrackCueList extends js.Object {
+  def length: Double = js.native
+
+  @JSBracketAccess
+  def apply(index: Double): TextTrackCue = js.native
+
+  def getCueById(id: String): TextTrackCue = js.native
+}
+
+@js.native
+trait TextTrackCue extends EventTarget {
+  def track: TextTrack = js.native
+
+  var id: String = js.native
+  var startTime: Double = js.native
+  var endTime: Double = js.native
+  var pauseOnExit: Boolean = js.native
+
+  var onenter: js.Function1[Event, Any] = js.native
+  var onexit: js.Function1[Event, Any] = js.native
+}
diff --git a/src/main/scala/org/scalajs/dom/experimental/mediastream/package.scala b/src/main/scala/org/scalajs/dom/experimental/mediastream/package.scala
new file mode 100644
index 000000000..055fa66f2
--- /dev/null
+++ b/src/main/scala/org/scalajs/dom/experimental/mediastream/package.scala
@@ -0,0 +1,12 @@
+package org.scalajs.dom.experimental
+
+import scala.scalajs.js
+import scala.scalajs.js.|
+
+package object mediastream {
+  type BufferSource = js.typedarray.ArrayBufferView | js.typedarray.ArrayBuffer
+  type AppendMode = String
+  type TextTrackMode = String
+  type EndOfStreamError = String
+  type ReadyState = String
+}
diff --git a/src/main/scala/org/scalajs/dom/raw/Html.scala b/src/main/scala/org/scalajs/dom/raw/Html.scala
index 7ec8a688e..831cf5f52 100644
--- a/src/main/scala/org/scalajs/dom/raw/Html.scala
+++ b/src/main/scala/org/scalajs/dom/raw/Html.scala
@@ -11,6 +11,9 @@ package org.scalajs.dom.raw
 
 import scala.scalajs.js
 import scala.scalajs.js.annotation._
+import scala.scalajs.js.|
+import org.scalajs.dom
+import dom.experimental.mediastream.{MediaStream, MediaSource}
 
 @js.native
 @JSGlobal
@@ -3188,6 +3191,11 @@ abstract class HTMLMediaElement extends HTMLElement {
    * MDN
    */
   def audioTracks: AudioTrackList = js.native
+
+  /**
+   * Sets or returns the object which serves as the source of the media associated with the HTMLMediaElement.
+   */
+  var srcObject: js.UndefOr[MediaStream | MediaSource | Blob]
 }
 
 @js.native
diff --git a/src/main/scala/org/scalajs/dom/raw/lib.scala b/src/main/scala/org/scalajs/dom/raw/lib.scala
index e7ef42c59..6189da275 100644
--- a/src/main/scala/org/scalajs/dom/raw/lib.scala
+++ b/src/main/scala/org/scalajs/dom/raw/lib.scala
@@ -7401,10 +7401,10 @@ trait WindowConsole extends js.Object {
 
 @js.native
 trait AudioTrack extends js.Object {
-  var kind: String = js.native
-  var language: String = js.native
-  var id: String = js.native
-  var label: String = js.native
+  val id: String = js.native
+  val kind: String = js.native
+  val label: String = js.native
+  val language: String = js.native
   var enabled: Boolean = js.native
 }