diff --git a/libraries/stdlib/js/idl/org.w3c.dom.encryptedmedia.idl b/libraries/stdlib/js/idl/org.w3c.dom.encryptedmedia.idl
new file mode 100644
index 00000000000..d507bdc6e72
--- /dev/null
+++ b/libraries/stdlib/js/idl/org.w3c.dom.encryptedmedia.idl
@@ -0,0 +1,102 @@
+package org.w3c.dom.encryptedmedia;
+
+
+// Downloaded from https://www.w3.org/TR/encrypted-media
+partial interface Navigator {
+ [SecureContext] Promise<MediaKeySystemAccess> requestMediaKeySystemAccess(DOMString keySystem, sequence<MediaKeySystemConfiguration> supportedConfigurations);
+};
+enum MediaKeysRequirement {
+    "required",
+    "optional",
+    "not-allowed"
+};
+dictionary MediaKeySystemConfiguration {
+ DOMString label = "";
+ sequence<DOMString> initDataTypes = [];
+ sequence<MediaKeySystemMediaCapability> audioCapabilities = [];
+ sequence<MediaKeySystemMediaCapability> videoCapabilities = [];
+ MediaKeysRequirement distinctiveIdentifier = "optional";
+ MediaKeysRequirement persistentState = "optional";
+ sequence<DOMString> sessionTypes;
+};
+dictionary MediaKeySystemMediaCapability {
+ DOMString contentType = "";
+ DOMString robustness = "";
+};
+[SecureContext]
+interface MediaKeySystemAccess {
+ readonly attribute DOMString keySystem;
+ MediaKeySystemConfiguration getConfiguration();
+ Promise<MediaKeys> createMediaKeys();
+};
+enum MediaKeySessionType {
+    "temporary",
+    "persistent-license"
+};
+[SecureContext]
+interface MediaKeys {
+ MediaKeySession createSession(optional MediaKeySessionType sessionType = "temporary");
+ Promise<boolean> setServerCertificate(BufferSource serverCertificate);
+};
+[SecureContext]
+interface MediaKeySession : EventTarget {
+ readonly attribute DOMString sessionId;
+ readonly attribute unrestricted double expiration;
+ readonly attribute Promise<void> closed;
+ readonly attribute MediaKeyStatusMap keyStatuses;
+ attribute EventHandler onkeystatuseschange;
+ attribute EventHandler onmessage;
+ Promise<void> generateRequest(DOMString initDataType, BufferSource initData);
+ Promise<boolean> load(DOMString sessionId);
+ Promise<void> update(BufferSource response);
+ Promise<void> close();
+ Promise<void> remove();
+};
+[SecureContext]
+interface MediaKeyStatusMap {
+ iterable<BufferSource, MediaKeyStatus>;
+ readonly attribute unsigned long size;
+ boolean has(BufferSource keyId);
+ any get(BufferSource keyId);
+};
+enum MediaKeyStatus {
+    "usable",
+    "expired",
+    "released",
+    "output-restricted",
+    "output-downscaled",
+    "status-pending",
+    "internal-error"
+};
+enum MediaKeyMessageType {
+    "license-request",
+    "license-renewal",
+    "license-release",
+    "individualization-request"
+};
+[SecureContext,
+ Constructor(DOMString type, MediaKeyMessageEventInit eventInitDict)]
+interface MediaKeyMessageEvent : Event {
+ readonly attribute MediaKeyMessageType messageType;
+ readonly attribute ArrayBuffer message;
+};
+dictionary MediaKeyMessageEventInit : EventInit {
+ required MediaKeyMessageType messageType;
+ required ArrayBuffer message;
+};
+partial interface HTMLMediaElement {
+ [SecureContext] readonly attribute MediaKeys? mediaKeys;
+ attribute EventHandler onencrypted;
+ attribute EventHandler onwaitingforkey;
+ [SecureContext] Promise<void> setMediaKeys(MediaKeys? mediaKeys);
+};
+[Constructor(DOMString type, optional MediaEncryptedEventInit eventInitDict)]
+interface MediaEncryptedEvent : Event {
+ readonly attribute DOMString initDataType;
+ readonly attribute ArrayBuffer? initData;
+};
+dictionary MediaEncryptedEventInit : EventInit {
+ DOMString initDataType = "";
+ ArrayBuffer? initData = null;
+};
+
diff --git a/libraries/stdlib/js/idl/org.w3c.dom.mediasource.idl b/libraries/stdlib/js/idl/org.w3c.dom.mediasource.idl
new file mode 100644
index 00000000000..8b271bed1fb
--- /dev/null
+++ b/libraries/stdlib/js/idl/org.w3c.dom.mediasource.idl
@@ -0,0 +1,72 @@
+package org.w3c.dom.mediasource;
+
+
+// Downloaded from https://www.w3.org/TR/media-source/
+enum ReadyState {
+    "closed",
+    "open",
+    "ended"
+};
+enum EndOfStreamError {
+    "network",
+    "decode"
+};
+[Constructor]
+interface MediaSource : EventTarget {
+ readonly attribute SourceBufferList sourceBuffers;
+ readonly attribute SourceBufferList activeSourceBuffers;
+ readonly attribute ReadyState readyState;
+ attribute unrestricted double duration;
+ attribute EventHandler onsourceopen;
+ attribute EventHandler onsourceended;
+ attribute EventHandler onsourceclose;
+ SourceBuffer addSourceBuffer(DOMString type);
+ void removeSourceBuffer(SourceBuffer sourceBuffer);
+ void endOfStream(optional EndOfStreamError error);
+ void setLiveSeekableRange(double start, double end);
+ void clearLiveSeekableRange();
+ static boolean isTypeSupported(DOMString type);
+};
+enum AppendMode {
+    "segments",
+    "sequence"
+};
+interface SourceBuffer : EventTarget {
+ attribute AppendMode mode;
+ readonly attribute boolean updating;
+ readonly attribute TimeRanges buffered;
+ attribute double timestampOffset;
+ readonly attribute AudioTrackList audioTracks;
+ readonly attribute VideoTrackList videoTracks;
+ readonly attribute TextTrackList textTracks;
+ attribute double appendWindowStart;
+ attribute unrestricted double appendWindowEnd;
+ attribute EventHandler onupdatestart;
+ attribute EventHandler onupdate;
+ attribute EventHandler onupdateend;
+ attribute EventHandler onerror;
+ attribute EventHandler onabort;
+ void appendBuffer(BufferSource data);
+ void abort();
+ void remove(double start, unrestricted double end);
+};
+interface SourceBufferList : EventTarget {
+ readonly attribute unsigned long length;
+ attribute EventHandler onaddsourcebuffer;
+ attribute EventHandler onremovesourcebuffer;
+ getter SourceBuffer (unsigned long index);
+};
+[Exposed=Window]
+partial interface URL {
+ static DOMString createObjectURL(MediaSource mediaSource);
+};
+partial interface AudioTrack {
+ readonly attribute SourceBuffer? sourceBuffer;
+};
+partial interface VideoTrack {
+ readonly attribute SourceBuffer? sourceBuffer;
+};
+partial interface TextTrack {
+ readonly attribute SourceBuffer? sourceBuffer;
+};
+
diff --git a/libraries/stdlib/js/src/org.w3c/org.khronos.webgl.kt b/libraries/stdlib/js/src/org.w3c/org.khronos.webgl.kt
index ee2c7c0ad2e..3f496191b7f 100644
--- a/libraries/stdlib/js/src/org.w3c/org.khronos.webgl.kt
+++ b/libraries/stdlib/js/src/org.w3c/org.khronos.webgl.kt
@@ -1,5 +1,5 @@
 /*
- * Copyright 2010-2019 JetBrains s.r.o. and Kotlin Programming Language contributors.
+ * Copyright 2010-2020 JetBrains s.r.o. and Kotlin Programming Language contributors.
  * Use of this source code is governed by the Apache 2.0 license that can be found in the license/LICENSE.txt file.
  */
 
@@ -13,8 +13,10 @@ import org.w3c.css.masking.*
 import org.w3c.dom.*
 import org.w3c.dom.clipboard.*
 import org.w3c.dom.css.*
+import org.w3c.dom.encryptedmedia.*
 import org.w3c.dom.events.*
 import org.w3c.dom.mediacapture.*
+import org.w3c.dom.mediasource.*
 import org.w3c.dom.parsing.*
 import org.w3c.dom.pointerevents.*
 import org.w3c.dom.svg.*
diff --git a/libraries/stdlib/js/src/org.w3c/org.w3c.css.masking.kt b/libraries/stdlib/js/src/org.w3c/org.w3c.css.masking.kt
index 38d9964a4d5..50628209f67 100644
--- a/libraries/stdlib/js/src/org.w3c/org.w3c.css.masking.kt
+++ b/libraries/stdlib/js/src/org.w3c/org.w3c.css.masking.kt
@@ -1,5 +1,5 @@
 /*
- * Copyright 2010-2019 JetBrains s.r.o. and Kotlin Programming Language contributors.
+ * Copyright 2010-2020 JetBrains s.r.o. and Kotlin Programming Language contributors.
  * Use of this source code is governed by the Apache 2.0 license that can be found in the license/LICENSE.txt file.
  */
 
@@ -13,8 +13,10 @@ import org.khronos.webgl.*
 import org.w3c.dom.*
 import org.w3c.dom.clipboard.*
 import org.w3c.dom.css.*
+import org.w3c.dom.encryptedmedia.*
 import org.w3c.dom.events.*
 import org.w3c.dom.mediacapture.*
+import org.w3c.dom.mediasource.*
 import org.w3c.dom.parsing.*
 import org.w3c.dom.pointerevents.*
 import org.w3c.dom.svg.*
diff --git a/libraries/stdlib/js/src/org.w3c/org.w3c.dom.clipboard.kt b/libraries/stdlib/js/src/org.w3c/org.w3c.dom.clipboard.kt
index aa12d65eef8..38f2da5d563 100644
--- a/libraries/stdlib/js/src/org.w3c/org.w3c.dom.clipboard.kt
+++ b/libraries/stdlib/js/src/org.w3c/org.w3c.dom.clipboard.kt
@@ -1,5 +1,5 @@
 /*
- * Copyright 2010-2019 JetBrains s.r.o. and Kotlin Programming Language contributors.
+ * Copyright 2010-2020 JetBrains s.r.o. and Kotlin Programming Language contributors.
  * Use of this source code is governed by the Apache 2.0 license that can be found in the license/LICENSE.txt file.
  */
 
@@ -13,8 +13,10 @@ import org.khronos.webgl.*
 import org.w3c.css.masking.*
 import org.w3c.dom.*
 import org.w3c.dom.css.*
+import org.w3c.dom.encryptedmedia.*
 import org.w3c.dom.events.*
 import org.w3c.dom.mediacapture.*
+import org.w3c.dom.mediasource.*
 import org.w3c.dom.parsing.*
 import org.w3c.dom.pointerevents.*
 import org.w3c.dom.svg.*
diff --git a/libraries/stdlib/js/src/org.w3c/org.w3c.dom.css.kt b/libraries/stdlib/js/src/org.w3c/org.w3c.dom.css.kt
index b05aeaef2c9..d538ba2f16a 100644
--- a/libraries/stdlib/js/src/org.w3c/org.w3c.dom.css.kt
+++ b/libraries/stdlib/js/src/org.w3c/org.w3c.dom.css.kt
@@ -1,5 +1,5 @@
 /*
- * Copyright 2010-2019 JetBrains s.r.o. and Kotlin Programming Language contributors.
+ * Copyright 2010-2020 JetBrains s.r.o. and Kotlin Programming Language contributors.
  * Use of this source code is governed by the Apache 2.0 license that can be found in the license/LICENSE.txt file.
  */
 
@@ -13,8 +13,10 @@ import org.khronos.webgl.*
 import org.w3c.css.masking.*
 import org.w3c.dom.*
 import org.w3c.dom.clipboard.*
+import org.w3c.dom.encryptedmedia.*
 import org.w3c.dom.events.*
 import org.w3c.dom.mediacapture.*
+import org.w3c.dom.mediasource.*
 import org.w3c.dom.parsing.*
 import org.w3c.dom.pointerevents.*
 import org.w3c.dom.svg.*
diff --git a/libraries/stdlib/js/src/org.w3c/org.w3c.dom.encryptedmedia.kt b/libraries/stdlib/js/src/org.w3c/org.w3c.dom.encryptedmedia.kt
new file mode 100644
index 00000000000..993211e89cb
--- /dev/null
+++ b/libraries/stdlib/js/src/org.w3c/org.w3c.dom.encryptedmedia.kt
@@ -0,0 +1,234 @@
+/*
+ * Copyright 2010-2020 JetBrains s.r.o. and Kotlin Programming Language contributors.
+ * Use of this source code is governed by the Apache 2.0 license that can be found in the license/LICENSE.txt file.
+ */
+
+// NOTE: THIS FILE IS AUTO-GENERATED, DO NOT EDIT!
+// See github.com/kotlin/dukat for details
+
+package org.w3c.dom.encryptedmedia
+
+import kotlin.js.*
+import org.khronos.webgl.*
+import org.w3c.css.masking.*
+import org.w3c.dom.*
+import org.w3c.dom.clipboard.*
+import org.w3c.dom.css.*
+import org.w3c.dom.events.*
+import org.w3c.dom.mediacapture.*
+import org.w3c.dom.mediasource.*
+import org.w3c.dom.parsing.*
+import org.w3c.dom.pointerevents.*
+import org.w3c.dom.svg.*
+import org.w3c.dom.url.*
+import org.w3c.fetch.*
+import org.w3c.files.*
+import org.w3c.notifications.*
+import org.w3c.performance.*
+import org.w3c.workers.*
+import org.w3c.xhr.*
+
+public external interface MediaKeySystemConfiguration {
+    var label: String? /* = "" */
+        get() = definedExternally
+        set(value) = definedExternally
+    var initDataTypes: Array<String>? /* = arrayOf() */
+        get() = definedExternally
+        set(value) = definedExternally
+    var audioCapabilities: Array<MediaKeySystemMediaCapability>? /* = arrayOf() */
+        get() = definedExternally
+        set(value) = definedExternally
+    var videoCapabilities: Array<MediaKeySystemMediaCapability>? /* = arrayOf() */
+        get() = definedExternally
+        set(value) = definedExternally
+    var distinctiveIdentifier: MediaKeysRequirement? /* = MediaKeysRequirement.OPTIONAL */
+        get() = definedExternally
+        set(value) = definedExternally
+    var persistentState: MediaKeysRequirement? /* = MediaKeysRequirement.OPTIONAL */
+        get() = definedExternally
+        set(value) = definedExternally
+    var sessionTypes: Array<String>?
+        get() = definedExternally
+        set(value) = definedExternally
+}
+
+@kotlin.internal.InlineOnly
+public inline fun MediaKeySystemConfiguration(label: String? = "", initDataTypes: Array<String>? = arrayOf(), audioCapabilities: Array<MediaKeySystemMediaCapability>? = arrayOf(), videoCapabilities: Array<MediaKeySystemMediaCapability>? = arrayOf(), distinctiveIdentifier: MediaKeysRequirement? = MediaKeysRequirement.OPTIONAL, persistentState: MediaKeysRequirement? = MediaKeysRequirement.OPTIONAL, sessionTypes: Array<String>? = undefined): MediaKeySystemConfiguration {
+    val o = js("({})")
+    o["label"] = label
+    o["initDataTypes"] = initDataTypes
+    o["audioCapabilities"] = audioCapabilities
+    o["videoCapabilities"] = videoCapabilities
+    o["distinctiveIdentifier"] = distinctiveIdentifier
+    o["persistentState"] = persistentState
+    o["sessionTypes"] = sessionTypes
+    return o
+}
+
+public external interface MediaKeySystemMediaCapability {
+    var contentType: String? /* = "" */
+        get() = definedExternally
+        set(value) = definedExternally
+    var robustness: String? /* = "" */
+        get() = definedExternally
+        set(value) = definedExternally
+}
+
+@kotlin.internal.InlineOnly
+public inline fun MediaKeySystemMediaCapability(contentType: String? = "", robustness: String? = ""): MediaKeySystemMediaCapability {
+    val o = js("({})")
+    o["contentType"] = contentType
+    o["robustness"] = robustness
+    return o
+}
+
+public external abstract class MediaKeySystemAccess {
+    open val keySystem: String
+    fun getConfiguration(): MediaKeySystemConfiguration
+    fun createMediaKeys(): Promise<MediaKeys>
+}
+
+public external abstract class MediaKeys {
+    fun createSession(sessionType: MediaKeySessionType = definedExternally): MediaKeySession
+    fun setServerCertificate(serverCertificate: dynamic): Promise<Boolean>
+}
+
+public external abstract class MediaKeySession : EventTarget {
+    open val sessionId: String
+    open val expiration: Double
+    open val closed: Promise<Unit>
+    open val keyStatuses: MediaKeyStatusMap
+    open var onkeystatuseschange: ((Event) -> dynamic)?
+    open var onmessage: ((MessageEvent) -> dynamic)?
+    fun generateRequest(initDataType: String, initData: dynamic): Promise<Unit>
+    fun load(sessionId: String): Promise<Boolean>
+    fun update(response: dynamic): Promise<Unit>
+    fun close(): Promise<Unit>
+    fun remove(): Promise<Unit>
+}
+
+public external abstract class MediaKeyStatusMap {
+    open val size: Int
+    fun has(keyId: dynamic): Boolean
+    fun get(keyId: dynamic): Any?
+}
+
+public external open class MediaKeyMessageEvent(type: String, eventInitDict: MediaKeyMessageEventInit) : Event {
+    open val messageType: MediaKeyMessageType
+    open val message: ArrayBuffer
+
+    companion object {
+        val NONE: Short
+        val CAPTURING_PHASE: Short
+        val AT_TARGET: Short
+        val BUBBLING_PHASE: Short
+    }
+}
+
+public external interface MediaKeyMessageEventInit : EventInit {
+    var messageType: MediaKeyMessageType?
+        get() = definedExternally
+        set(value) = definedExternally
+    var message: ArrayBuffer?
+        get() = definedExternally
+        set(value) = definedExternally
+}
+
+@kotlin.internal.InlineOnly
+public inline fun MediaKeyMessageEventInit(messageType: MediaKeyMessageType?, message: ArrayBuffer?, bubbles: Boolean? = false, cancelable: Boolean? = false, composed: Boolean? = false): MediaKeyMessageEventInit {
+    val o = js("({})")
+    o["messageType"] = messageType
+    o["message"] = message
+    o["bubbles"] = bubbles
+    o["cancelable"] = cancelable
+    o["composed"] = composed
+    return o
+}
+
+public external open class MediaEncryptedEvent(type: String, eventInitDict: MediaEncryptedEventInit = definedExternally) : Event {
+    open val initDataType: String
+    open val initData: ArrayBuffer?
+
+    companion object {
+        val NONE: Short
+        val CAPTURING_PHASE: Short
+        val AT_TARGET: Short
+        val BUBBLING_PHASE: Short
+    }
+}
+
+public external interface MediaEncryptedEventInit : EventInit {
+    var initDataType: String? /* = "" */
+        get() = definedExternally
+        set(value) = definedExternally
+    var initData: ArrayBuffer? /* = null */
+        get() = definedExternally
+        set(value) = definedExternally
+}
+
+@kotlin.internal.InlineOnly
+public inline fun MediaEncryptedEventInit(initDataType: String? = "", initData: ArrayBuffer? = null, bubbles: Boolean? = false, cancelable: Boolean? = false, composed: Boolean? = false): MediaEncryptedEventInit {
+    val o = js("({})")
+    o["initDataType"] = initDataType
+    o["initData"] = initData
+    o["bubbles"] = bubbles
+    o["cancelable"] = cancelable
+    o["composed"] = composed
+    return o
+}
+
+/* please, don't implement this interface! */
+@Suppress("NESTED_CLASS_IN_EXTERNAL_INTERFACE")
+public external interface MediaKeysRequirement {
+    companion object
+}
+
+public inline val MediaKeysRequirement.Companion.REQUIRED: MediaKeysRequirement get() = "required".asDynamic().unsafeCast<MediaKeysRequirement>()
+
+public inline val MediaKeysRequirement.Companion.OPTIONAL: MediaKeysRequirement get() = "optional".asDynamic().unsafeCast<MediaKeysRequirement>()
+
+public inline val MediaKeysRequirement.Companion.NOT_ALLOWED: MediaKeysRequirement get() = "not-allowed".asDynamic().unsafeCast<MediaKeysRequirement>()
+
+/* please, don't implement this interface! */
+@Suppress("NESTED_CLASS_IN_EXTERNAL_INTERFACE")
+public external interface MediaKeySessionType {
+    companion object
+}
+
+public inline val MediaKeySessionType.Companion.TEMPORARY: MediaKeySessionType get() = "temporary".asDynamic().unsafeCast<MediaKeySessionType>()
+
+public inline val MediaKeySessionType.Companion.PERSISTENT_LICENSE: MediaKeySessionType get() = "persistent-license".asDynamic().unsafeCast<MediaKeySessionType>()
+
+/* please, don't implement this interface! */
+@Suppress("NESTED_CLASS_IN_EXTERNAL_INTERFACE")
+public external interface MediaKeyStatus {
+    companion object
+}
+
+public inline val MediaKeyStatus.Companion.USABLE: MediaKeyStatus get() = "usable".asDynamic().unsafeCast<MediaKeyStatus>()
+
+public inline val MediaKeyStatus.Companion.EXPIRED: MediaKeyStatus get() = "expired".asDynamic().unsafeCast<MediaKeyStatus>()
+
+public inline val MediaKeyStatus.Companion.RELEASED: MediaKeyStatus get() = "released".asDynamic().unsafeCast<MediaKeyStatus>()
+
+public inline val MediaKeyStatus.Companion.OUTPUT_RESTRICTED: MediaKeyStatus get() = "output-restricted".asDynamic().unsafeCast<MediaKeyStatus>()
+
+public inline val MediaKeyStatus.Companion.OUTPUT_DOWNSCALED: MediaKeyStatus get() = "output-downscaled".asDynamic().unsafeCast<MediaKeyStatus>()
+
+public inline val MediaKeyStatus.Companion.STATUS_PENDING: MediaKeyStatus get() = "status-pending".asDynamic().unsafeCast<MediaKeyStatus>()
+
+public inline val MediaKeyStatus.Companion.INTERNAL_ERROR: MediaKeyStatus get() = "internal-error".asDynamic().unsafeCast<MediaKeyStatus>()
+
+/* please, don't implement this interface! */
+@Suppress("NESTED_CLASS_IN_EXTERNAL_INTERFACE")
+public external interface MediaKeyMessageType {
+    companion object
+}
+
+public inline val MediaKeyMessageType.Companion.LICENSE_REQUEST: MediaKeyMessageType get() = "license-request".asDynamic().unsafeCast<MediaKeyMessageType>()
+
+public inline val MediaKeyMessageType.Companion.LICENSE_RENEWAL: MediaKeyMessageType get() = "license-renewal".asDynamic().unsafeCast<MediaKeyMessageType>()
+
+public inline val MediaKeyMessageType.Companion.LICENSE_RELEASE: MediaKeyMessageType get() = "license-release".asDynamic().unsafeCast<MediaKeyMessageType>()
+
+public inline val MediaKeyMessageType.Companion.INDIVIDUALIZATION_REQUEST: MediaKeyMessageType get() = "individualization-request".asDynamic().unsafeCast<MediaKeyMessageType>()
\ No newline at end of file
diff --git a/libraries/stdlib/js/src/org.w3c/org.w3c.dom.events.kt b/libraries/stdlib/js/src/org.w3c/org.w3c.dom.events.kt
index 81f129ce3bd..a86ea8aad02 100644
--- a/libraries/stdlib/js/src/org.w3c/org.w3c.dom.events.kt
+++ b/libraries/stdlib/js/src/org.w3c/org.w3c.dom.events.kt
@@ -1,5 +1,5 @@
 /*
- * Copyright 2010-2019 JetBrains s.r.o. and Kotlin Programming Language contributors.
+ * Copyright 2010-2020 JetBrains s.r.o. and Kotlin Programming Language contributors.
  * Use of this source code is governed by the Apache 2.0 license that can be found in the license/LICENSE.txt file.
  */
 
@@ -14,7 +14,9 @@ import org.w3c.css.masking.*
 import org.w3c.dom.*
 import org.w3c.dom.clipboard.*
 import org.w3c.dom.css.*
+import org.w3c.dom.encryptedmedia.*
 import org.w3c.dom.mediacapture.*
+import org.w3c.dom.mediasource.*
 import org.w3c.dom.parsing.*
 import org.w3c.dom.pointerevents.*
 import org.w3c.dom.svg.*
diff --git a/libraries/stdlib/js/src/org.w3c/org.w3c.dom.kt b/libraries/stdlib/js/src/org.w3c/org.w3c.dom.kt
index 9aaf3eacf7c..91bac5b7e03 100644
--- a/libraries/stdlib/js/src/org.w3c/org.w3c.dom.kt
+++ b/libraries/stdlib/js/src/org.w3c/org.w3c.dom.kt
@@ -1,5 +1,5 @@
 /*
- * Copyright 2010-2019 JetBrains s.r.o. and Kotlin Programming Language contributors.
+ * Copyright 2010-2020 JetBrains s.r.o. and Kotlin Programming Language contributors.
  * Use of this source code is governed by the Apache 2.0 license that can be found in the license/LICENSE.txt file.
  */
 
@@ -13,8 +13,10 @@ import org.khronos.webgl.*
 import org.w3c.css.masking.*
 import org.w3c.dom.clipboard.*
 import org.w3c.dom.css.*
+import org.w3c.dom.encryptedmedia.*
 import org.w3c.dom.events.*
 import org.w3c.dom.mediacapture.*
+import org.w3c.dom.mediasource.*
 import org.w3c.dom.parsing.*
 import org.w3c.dom.pointerevents.*
 import org.w3c.dom.svg.*
@@ -1277,7 +1279,7 @@ public external abstract class HTMLTrackElement : HTMLElement {
 public external abstract class HTMLMediaElement : HTMLElement {
     open val error: MediaError?
     open var src: String
-    open var srcObject: dynamic
+    open var srcObject: MediaProvider?
     open val currentSrc: String
     open var crossOrigin: String?
     open val networkState: Short
@@ -1302,6 +1304,9 @@ public external abstract class HTMLMediaElement : HTMLElement {
     open val audioTracks: AudioTrackList
     open val videoTracks: VideoTrackList
     open val textTracks: TextTrackList
+    open val mediaKeys: MediaKeys?
+    open var onencrypted: ((Event) -> dynamic)?
+    open var onwaitingforkey: ((Event) -> dynamic)?
     fun load()
     fun canPlayType(type: String): CanPlayTypeResult
     fun fastSeek(time: Double)
@@ -1309,6 +1314,7 @@ public external abstract class HTMLMediaElement : HTMLElement {
     fun play(): Promise<Unit>
     fun pause()
     fun addTextTrack(kind: TextTrackKind, label: String = definedExternally, language: String = definedExternally): TextTrack
+    fun setMediaKeys(mediaKeys: MediaKeys?): Promise<Unit>
 
     companion object {
         val NETWORK_EMPTY: Short
@@ -1378,6 +1384,7 @@ public external abstract class AudioTrack : UnionAudioTrackOrTextTrackOrVideoTra
     open val label: String
     open val language: String
     open var enabled: Boolean
+    open val sourceBuffer: SourceBuffer?
 }
 
 /**
@@ -1404,6 +1411,7 @@ public external abstract class VideoTrack : UnionAudioTrackOrTextTrackOrVideoTra
     open val label: String
     open val language: String
     open var selected: Boolean
+    open val sourceBuffer: SourceBuffer?
 }
 
 public external abstract class TextTrackList : EventTarget {
@@ -1430,6 +1438,7 @@ public external abstract class TextTrack : EventTarget, UnionAudioTrackOrTextTra
     open val cues: TextTrackCueList?
     open val activeCues: TextTrackCueList?
     open var oncuechange: ((Event) -> dynamic)?
+    open val sourceBuffer: SourceBuffer?
     fun addCue(cue: TextTrackCue)
     fun removeCue(cue: TextTrackCue)
 }
@@ -3754,6 +3763,7 @@ public external abstract class Navigator : NavigatorID, NavigatorLanguage, Navig
     open val mediaDevices: MediaDevices
     open val maxTouchPoints: Int
     open val serviceWorker: ServiceWorkerContainer
+    fun requestMediaKeySystemAccess(keySystem: String, supportedConfigurations: Array<MediaKeySystemConfiguration>): Promise<MediaKeySystemAccess>
     fun getUserMedia(constraints: MediaStreamConstraints, successCallback: (MediaStream) -> Unit, errorCallback: (dynamic) -> Unit)
     fun vibrate(pattern: dynamic): Boolean
 }
@@ -6348,6 +6358,8 @@ public external interface UnionElementOrRadioNodeList
 
 public external interface UnionHTMLOptGroupElementOrHTMLOptionElement
 
+public external interface MediaProvider
+
 public external interface UnionAudioTrackOrTextTrackOrVideoTrack
 
 public external interface UnionElementOrMouseEvent
diff --git a/libraries/stdlib/js/src/org.w3c/org.w3c.dom.mediacapture.kt b/libraries/stdlib/js/src/org.w3c/org.w3c.dom.mediacapture.kt
index 038eb86e8bb..84ebee5a423 100644
--- a/libraries/stdlib/js/src/org.w3c/org.w3c.dom.mediacapture.kt
+++ b/libraries/stdlib/js/src/org.w3c/org.w3c.dom.mediacapture.kt
@@ -1,5 +1,5 @@
 /*
- * Copyright 2010-2019 JetBrains s.r.o. and Kotlin Programming Language contributors.
+ * Copyright 2010-2020 JetBrains s.r.o. and Kotlin Programming Language contributors.
  * Use of this source code is governed by the Apache 2.0 license that can be found in the license/LICENSE.txt file.
  */
 
@@ -14,7 +14,9 @@ import org.w3c.css.masking.*
 import org.w3c.dom.*
 import org.w3c.dom.clipboard.*
 import org.w3c.dom.css.*
+import org.w3c.dom.encryptedmedia.*
 import org.w3c.dom.events.*
+import org.w3c.dom.mediasource.*
 import org.w3c.dom.parsing.*
 import org.w3c.dom.pointerevents.*
 import org.w3c.dom.svg.*
@@ -29,7 +31,7 @@ import org.w3c.xhr.*
 /**
  * Exposes the JavaScript [MediaStream](https://developer.mozilla.org/en/docs/Web/API/MediaStream) to Kotlin
  */
-public external open class MediaStream() : EventTarget {
+public external open class MediaStream() : EventTarget, MediaProvider {
     constructor(stream: MediaStream)
     constructor(tracks: Array<MediaStreamTrack>)
     open val id: String
diff --git a/libraries/stdlib/js/src/org.w3c/org.w3c.dom.mediasource.kt b/libraries/stdlib/js/src/org.w3c/org.w3c.dom.mediasource.kt
new file mode 100644
index 00000000000..7ba5aca271c
--- /dev/null
+++ b/libraries/stdlib/js/src/org.w3c/org.w3c.dom.mediasource.kt
@@ -0,0 +1,109 @@
+/*
+ * Copyright 2010-2020 JetBrains s.r.o. and Kotlin Programming Language contributors.
+ * Use of this source code is governed by the Apache 2.0 license that can be found in the license/LICENSE.txt file.
+ */
+
+// NOTE: THIS FILE IS AUTO-GENERATED, DO NOT EDIT!
+// See github.com/kotlin/dukat for details
+
+package org.w3c.dom.mediasource
+
+import kotlin.js.*
+import org.khronos.webgl.*
+import org.w3c.css.masking.*
+import org.w3c.dom.*
+import org.w3c.dom.clipboard.*
+import org.w3c.dom.css.*
+import org.w3c.dom.encryptedmedia.*
+import org.w3c.dom.events.*
+import org.w3c.dom.mediacapture.*
+import org.w3c.dom.parsing.*
+import org.w3c.dom.pointerevents.*
+import org.w3c.dom.svg.*
+import org.w3c.dom.url.*
+import org.w3c.fetch.*
+import org.w3c.files.*
+import org.w3c.notifications.*
+import org.w3c.performance.*
+import org.w3c.workers.*
+import org.w3c.xhr.*
+
+public external open class MediaSource : EventTarget, MediaProvider {
+    open val sourceBuffers: SourceBufferList
+    open val activeSourceBuffers: SourceBufferList
+    open val readyState: ReadyState
+    var duration: Double
+    var onsourceopen: ((Event) -> dynamic)?
+    var onsourceended: ((Event) -> dynamic)?
+    var onsourceclose: ((Event) -> dynamic)?
+    fun addSourceBuffer(type: String): SourceBuffer
+    fun removeSourceBuffer(sourceBuffer: SourceBuffer)
+    fun endOfStream(error: EndOfStreamError = definedExternally)
+    fun setLiveSeekableRange(start: Double, end: Double)
+    fun clearLiveSeekableRange()
+
+    companion object {
+        fun isTypeSupported(type: String): Boolean
+    }
+}
+
+public external abstract class SourceBuffer : EventTarget {
+    open var mode: AppendMode
+    open val updating: Boolean
+    open val buffered: TimeRanges
+    open var timestampOffset: Double
+    open val audioTracks: AudioTrackList
+    open val videoTracks: VideoTrackList
+    open val textTracks: TextTrackList
+    open var appendWindowStart: Double
+    open var appendWindowEnd: Double
+    open var onupdatestart: ((Event) -> dynamic)?
+    open var onupdate: ((Event) -> dynamic)?
+    open var onupdateend: ((Event) -> dynamic)?
+    open var onerror: ((Event) -> dynamic)?
+    open var onabort: ((Event) -> dynamic)?
+    fun appendBuffer(data: dynamic)
+    fun abort()
+    fun remove(start: Double, end: Double)
+}
+
+public external abstract class SourceBufferList : EventTarget {
+    open val length: Int
+    open var onaddsourcebuffer: ((Event) -> dynamic)?
+    open var onremovesourcebuffer: ((Event) -> dynamic)?
+}
+
+@kotlin.internal.InlineOnly
+public inline operator fun SourceBufferList.get(index: Int): SourceBuffer? = asDynamic()[index]
+
+/* please, don't implement this interface! */
+@Suppress("NESTED_CLASS_IN_EXTERNAL_INTERFACE")
+public external interface ReadyState {
+    companion object
+}
+
+public inline val ReadyState.Companion.CLOSED: ReadyState get() = "closed".asDynamic().unsafeCast<ReadyState>()
+
+public inline val ReadyState.Companion.OPEN: ReadyState get() = "open".asDynamic().unsafeCast<ReadyState>()
+
+public inline val ReadyState.Companion.ENDED: ReadyState get() = "ended".asDynamic().unsafeCast<ReadyState>()
+
+/* please, don't implement this interface! */
+@Suppress("NESTED_CLASS_IN_EXTERNAL_INTERFACE")
+public external interface EndOfStreamError {
+    companion object
+}
+
+public inline val EndOfStreamError.Companion.NETWORK: EndOfStreamError get() = "network".asDynamic().unsafeCast<EndOfStreamError>()
+
+public inline val EndOfStreamError.Companion.DECODE: EndOfStreamError get() = "decode".asDynamic().unsafeCast<EndOfStreamError>()
+
+/* please, don't implement this interface! */
+@Suppress("NESTED_CLASS_IN_EXTERNAL_INTERFACE")
+public external interface AppendMode {
+    companion object
+}
+
+public inline val AppendMode.Companion.SEGMENTS: AppendMode get() = "segments".asDynamic().unsafeCast<AppendMode>()
+
+public inline val AppendMode.Companion.SEQUENCE: AppendMode get() = "sequence".asDynamic().unsafeCast<AppendMode>()
\ No newline at end of file
diff --git a/libraries/stdlib/js/src/org.w3c/org.w3c.dom.parsing.kt b/libraries/stdlib/js/src/org.w3c/org.w3c.dom.parsing.kt
index 8b131132dc3..7a73bed87d9 100644
--- a/libraries/stdlib/js/src/org.w3c/org.w3c.dom.parsing.kt
+++ b/libraries/stdlib/js/src/org.w3c/org.w3c.dom.parsing.kt
@@ -1,5 +1,5 @@
 /*
- * Copyright 2010-2019 JetBrains s.r.o. and Kotlin Programming Language contributors.
+ * Copyright 2010-2020 JetBrains s.r.o. and Kotlin Programming Language contributors.
  * Use of this source code is governed by the Apache 2.0 license that can be found in the license/LICENSE.txt file.
  */
 
@@ -14,8 +14,10 @@ import org.w3c.css.masking.*
 import org.w3c.dom.*
 import org.w3c.dom.clipboard.*
 import org.w3c.dom.css.*
+import org.w3c.dom.encryptedmedia.*
 import org.w3c.dom.events.*
 import org.w3c.dom.mediacapture.*
+import org.w3c.dom.mediasource.*
 import org.w3c.dom.pointerevents.*
 import org.w3c.dom.svg.*
 import org.w3c.dom.url.*
diff --git a/libraries/stdlib/js/src/org.w3c/org.w3c.dom.pointerevents.kt b/libraries/stdlib/js/src/org.w3c/org.w3c.dom.pointerevents.kt
index fc0c65683d5..53e311f59a3 100644
--- a/libraries/stdlib/js/src/org.w3c/org.w3c.dom.pointerevents.kt
+++ b/libraries/stdlib/js/src/org.w3c/org.w3c.dom.pointerevents.kt
@@ -1,5 +1,5 @@
 /*
- * Copyright 2010-2019 JetBrains s.r.o. and Kotlin Programming Language contributors.
+ * Copyright 2010-2020 JetBrains s.r.o. and Kotlin Programming Language contributors.
  * Use of this source code is governed by the Apache 2.0 license that can be found in the license/LICENSE.txt file.
  */
 
@@ -14,8 +14,10 @@ import org.w3c.css.masking.*
 import org.w3c.dom.*
 import org.w3c.dom.clipboard.*
 import org.w3c.dom.css.*
+import org.w3c.dom.encryptedmedia.*
 import org.w3c.dom.events.*
 import org.w3c.dom.mediacapture.*
+import org.w3c.dom.mediasource.*
 import org.w3c.dom.parsing.*
 import org.w3c.dom.svg.*
 import org.w3c.dom.url.*
diff --git a/libraries/stdlib/js/src/org.w3c/org.w3c.dom.svg.kt b/libraries/stdlib/js/src/org.w3c/org.w3c.dom.svg.kt
index e24726257ae..fbcbd3cc787 100644
--- a/libraries/stdlib/js/src/org.w3c/org.w3c.dom.svg.kt
+++ b/libraries/stdlib/js/src/org.w3c/org.w3c.dom.svg.kt
@@ -1,5 +1,5 @@
 /*
- * Copyright 2010-2019 JetBrains s.r.o. and Kotlin Programming Language contributors.
+ * Copyright 2010-2020 JetBrains s.r.o. and Kotlin Programming Language contributors.
  * Use of this source code is governed by the Apache 2.0 license that can be found in the license/LICENSE.txt file.
  */
 
@@ -14,8 +14,10 @@ import org.w3c.css.masking.*
 import org.w3c.dom.*
 import org.w3c.dom.clipboard.*
 import org.w3c.dom.css.*
+import org.w3c.dom.encryptedmedia.*
 import org.w3c.dom.events.*
 import org.w3c.dom.mediacapture.*
+import org.w3c.dom.mediasource.*
 import org.w3c.dom.parsing.*
 import org.w3c.dom.pointerevents.*
 import org.w3c.dom.url.*
diff --git a/libraries/stdlib/js/src/org.w3c/org.w3c.dom.url.kt b/libraries/stdlib/js/src/org.w3c/org.w3c.dom.url.kt
index 4d843f6ec1a..78c08cb1ac8 100644
--- a/libraries/stdlib/js/src/org.w3c/org.w3c.dom.url.kt
+++ b/libraries/stdlib/js/src/org.w3c/org.w3c.dom.url.kt
@@ -1,5 +1,5 @@
 /*
- * Copyright 2010-2019 JetBrains s.r.o. and Kotlin Programming Language contributors.
+ * Copyright 2010-2020 JetBrains s.r.o. and Kotlin Programming Language contributors.
  * Use of this source code is governed by the Apache 2.0 license that can be found in the license/LICENSE.txt file.
  */
 
@@ -14,8 +14,10 @@ import org.w3c.css.masking.*
 import org.w3c.dom.*
 import org.w3c.dom.clipboard.*
 import org.w3c.dom.css.*
+import org.w3c.dom.encryptedmedia.*
 import org.w3c.dom.events.*
 import org.w3c.dom.mediacapture.*
+import org.w3c.dom.mediasource.*
 import org.w3c.dom.parsing.*
 import org.w3c.dom.pointerevents.*
 import org.w3c.dom.svg.*
@@ -46,6 +48,7 @@ public external open class URL(url: String, base: String = definedExternally) {
     companion object {
         fun domainToASCII(domain: String): String
         fun domainToUnicode(domain: String): String
+        fun createObjectURL(mediaSource: MediaSource): String
         fun createObjectURL(blob: Blob): String
         fun createFor(blob: Blob): String
         fun revokeObjectURL(url: String)
diff --git a/libraries/stdlib/js/src/org.w3c/org.w3c.fetch.kt b/libraries/stdlib/js/src/org.w3c/org.w3c.fetch.kt
index d52f07b313f..0b40aefca3f 100644
--- a/libraries/stdlib/js/src/org.w3c/org.w3c.fetch.kt
+++ b/libraries/stdlib/js/src/org.w3c/org.w3c.fetch.kt
@@ -1,5 +1,5 @@
 /*
- * Copyright 2010-2019 JetBrains s.r.o. and Kotlin Programming Language contributors.
+ * Copyright 2010-2020 JetBrains s.r.o. and Kotlin Programming Language contributors.
  * Use of this source code is governed by the Apache 2.0 license that can be found in the license/LICENSE.txt file.
  */
 
@@ -14,8 +14,10 @@ import org.w3c.css.masking.*
 import org.w3c.dom.*
 import org.w3c.dom.clipboard.*
 import org.w3c.dom.css.*
+import org.w3c.dom.encryptedmedia.*
 import org.w3c.dom.events.*
 import org.w3c.dom.mediacapture.*
+import org.w3c.dom.mediasource.*
 import org.w3c.dom.parsing.*
 import org.w3c.dom.pointerevents.*
 import org.w3c.dom.svg.*
diff --git a/libraries/stdlib/js/src/org.w3c/org.w3c.files.kt b/libraries/stdlib/js/src/org.w3c/org.w3c.files.kt
index b5f15a66231..b16f21e9dff 100644
--- a/libraries/stdlib/js/src/org.w3c/org.w3c.files.kt
+++ b/libraries/stdlib/js/src/org.w3c/org.w3c.files.kt
@@ -1,5 +1,5 @@
 /*
- * Copyright 2010-2019 JetBrains s.r.o. and Kotlin Programming Language contributors.
+ * Copyright 2010-2020 JetBrains s.r.o. and Kotlin Programming Language contributors.
  * Use of this source code is governed by the Apache 2.0 license that can be found in the license/LICENSE.txt file.
  */
 
@@ -14,8 +14,10 @@ import org.w3c.css.masking.*
 import org.w3c.dom.*
 import org.w3c.dom.clipboard.*
 import org.w3c.dom.css.*
+import org.w3c.dom.encryptedmedia.*
 import org.w3c.dom.events.*
 import org.w3c.dom.mediacapture.*
+import org.w3c.dom.mediasource.*
 import org.w3c.dom.parsing.*
 import org.w3c.dom.pointerevents.*
 import org.w3c.dom.svg.*
@@ -29,7 +31,7 @@ import org.w3c.xhr.*
 /**
  * Exposes the JavaScript [Blob](https://developer.mozilla.org/en/docs/Web/API/Blob) to Kotlin
  */
-public external open class Blob(blobParts: Array<dynamic> = definedExternally, options: BlobPropertyBag = definedExternally) : ImageBitmapSource {
+public external open class Blob(blobParts: Array<dynamic> = definedExternally, options: BlobPropertyBag = definedExternally) : MediaProvider, ImageBitmapSource {
     open val size: Number
     open val type: String
     open val isClosed: Boolean
diff --git a/libraries/stdlib/js/src/org.w3c/org.w3c.notifications.kt b/libraries/stdlib/js/src/org.w3c/org.w3c.notifications.kt
index 3f1d4a3eed5..ccb49723692 100644
--- a/libraries/stdlib/js/src/org.w3c/org.w3c.notifications.kt
+++ b/libraries/stdlib/js/src/org.w3c/org.w3c.notifications.kt
@@ -1,5 +1,5 @@
 /*
- * Copyright 2010-2019 JetBrains s.r.o. and Kotlin Programming Language contributors.
+ * Copyright 2010-2020 JetBrains s.r.o. and Kotlin Programming Language contributors.
  * Use of this source code is governed by the Apache 2.0 license that can be found in the license/LICENSE.txt file.
  */
 
@@ -14,8 +14,10 @@ import org.w3c.css.masking.*
 import org.w3c.dom.*
 import org.w3c.dom.clipboard.*
 import org.w3c.dom.css.*
+import org.w3c.dom.encryptedmedia.*
 import org.w3c.dom.events.*
 import org.w3c.dom.mediacapture.*
+import org.w3c.dom.mediasource.*
 import org.w3c.dom.parsing.*
 import org.w3c.dom.pointerevents.*
 import org.w3c.dom.svg.*
diff --git a/libraries/stdlib/js/src/org.w3c/org.w3c.performance.kt b/libraries/stdlib/js/src/org.w3c/org.w3c.performance.kt
index 7198b8d7399..4351049b6d7 100644
--- a/libraries/stdlib/js/src/org.w3c/org.w3c.performance.kt
+++ b/libraries/stdlib/js/src/org.w3c/org.w3c.performance.kt
@@ -1,5 +1,5 @@
 /*
- * Copyright 2010-2019 JetBrains s.r.o. and Kotlin Programming Language contributors.
+ * Copyright 2010-2020 JetBrains s.r.o. and Kotlin Programming Language contributors.
  * Use of this source code is governed by the Apache 2.0 license that can be found in the license/LICENSE.txt file.
  */
 
@@ -14,8 +14,10 @@ import org.w3c.css.masking.*
 import org.w3c.dom.*
 import org.w3c.dom.clipboard.*
 import org.w3c.dom.css.*
+import org.w3c.dom.encryptedmedia.*
 import org.w3c.dom.events.*
 import org.w3c.dom.mediacapture.*
+import org.w3c.dom.mediasource.*
 import org.w3c.dom.parsing.*
 import org.w3c.dom.pointerevents.*
 import org.w3c.dom.svg.*
diff --git a/libraries/stdlib/js/src/org.w3c/org.w3c.workers.kt b/libraries/stdlib/js/src/org.w3c/org.w3c.workers.kt
index 0744ca92fe6..1dd2362197a 100644
--- a/libraries/stdlib/js/src/org.w3c/org.w3c.workers.kt
+++ b/libraries/stdlib/js/src/org.w3c/org.w3c.workers.kt
@@ -1,5 +1,5 @@
 /*
- * Copyright 2010-2019 JetBrains s.r.o. and Kotlin Programming Language contributors.
+ * Copyright 2010-2020 JetBrains s.r.o. and Kotlin Programming Language contributors.
  * Use of this source code is governed by the Apache 2.0 license that can be found in the license/LICENSE.txt file.
  */
 
@@ -14,8 +14,10 @@ import org.w3c.css.masking.*
 import org.w3c.dom.*
 import org.w3c.dom.clipboard.*
 import org.w3c.dom.css.*
+import org.w3c.dom.encryptedmedia.*
 import org.w3c.dom.events.*
 import org.w3c.dom.mediacapture.*
+import org.w3c.dom.mediasource.*
 import org.w3c.dom.parsing.*
 import org.w3c.dom.pointerevents.*
 import org.w3c.dom.svg.*
diff --git a/libraries/stdlib/js/src/org.w3c/org.w3c.xhr.kt b/libraries/stdlib/js/src/org.w3c/org.w3c.xhr.kt
index 1b2fcb94351..d1959610866 100644
--- a/libraries/stdlib/js/src/org.w3c/org.w3c.xhr.kt
+++ b/libraries/stdlib/js/src/org.w3c/org.w3c.xhr.kt
@@ -1,5 +1,5 @@
 /*
- * Copyright 2010-2019 JetBrains s.r.o. and Kotlin Programming Language contributors.
+ * Copyright 2010-2020 JetBrains s.r.o. and Kotlin Programming Language contributors.
  * Use of this source code is governed by the Apache 2.0 license that can be found in the license/LICENSE.txt file.
  */
 
@@ -14,8 +14,10 @@ import org.w3c.css.masking.*
 import org.w3c.dom.*
 import org.w3c.dom.clipboard.*
 import org.w3c.dom.css.*
+import org.w3c.dom.encryptedmedia.*
 import org.w3c.dom.events.*
 import org.w3c.dom.mediacapture.*
+import org.w3c.dom.mediasource.*
 import org.w3c.dom.parsing.*
 import org.w3c.dom.pointerevents.*
 import org.w3c.dom.svg.*
diff --git a/libraries/tools/dukat/src/main/kotlin/org/jetbrains/kotlin/tools/dukat/download.kt b/libraries/tools/dukat/src/main/kotlin/org/jetbrains/kotlin/tools/dukat/download.kt
index 243ba4c33b1..7542ab1a286 100644
--- a/libraries/tools/dukat/src/main/kotlin/org/jetbrains/kotlin/tools/dukat/download.kt
+++ b/libraries/tools/dukat/src/main/kotlin/org/jetbrains/kotlin/tools/dukat/download.kt
@@ -128,5 +128,8 @@ private val urls = listOf(
     "https://www.w3.org/TR/hr-time/" to "org.w3c.performance",
     "https://www.w3.org/TR/2012/REC-navigation-timing-20121217/" to "org.w3c.performance",
 
-    "https://w3c.github.io/ServiceWorker/" to "org.w3c.workers"
+    "https://w3c.github.io/ServiceWorker/" to "org.w3c.workers",
+
+    "https://www.w3.org/TR/media-source/" to "org.w3c.dom.mediasource",
+    "https://www.w3.org/TR/encrypted-media" to "org.w3c.dom.encryptedmedia"
 )