diff --git a/webspeechapi/webspeechapi.d.ts b/webspeechapi/webspeechapi.d.ts
new file mode 100644
index 000000000..a0c088bab
--- /dev/null
+++ b/webspeechapi/webspeechapi.d.ts
@@ -0,0 +1,146 @@
+// Type definitions for Web Speech API
+// Project: https://dvcs.w3.org/hg/speech-api/raw-file/tip/speechapi.html
+// Definitions by: SaschaNaz <https://github.com/saschanaz>
+// Definitions: https://github.com/borisyankov/DefinitelyTyped
+
+interface SpeechRecognition extends EventTarget {
+    grammars: SpeechGrammarList;
+    lang: string;
+    continuous: boolean;
+    interimResults: boolean;
+    maxAlternatives: number;
+    serviceURI: string;
+
+    start(): void;
+    stop(): void;
+    abort(): void;
+
+    onaudiostart: (ev: SpeechRecognitionEvent) => any;
+    onsoundstart: (ev: SpeechRecognitionEvent) => any;
+    onspeechstart: (ev: SpeechRecognitionEvent) => any;
+    onspeechend: (ev: SpeechRecognitionEvent) => any;
+    onsoundend: (ev: SpeechRecognitionEvent) => any;
+    onresult: (ev: SpeechRecognitionEvent) => any;
+    onnomatch: (ev: SpeechRecognitionEvent) => any;
+    onerror: (ev: SpeechRecognitionError) => any;
+    onstart: (ev: SpeechRecognitionEvent) => any;
+    onend: (ev: SpeechRecognitionEvent) => any;
+}
+interface SpeechRecognitionStatic {
+    prototype: SpeechRecognition;
+    new (): SpeechRecognition;
+}
+declare var SpeechRecognition: SpeechRecognitionStatic;
+declare var webkitSpeechRecognition: SpeechRecognitionStatic;
+
+interface SpeechRecognitionError extends Event {
+    error: string;
+    message: string;
+}
+
+interface SpeechRecognitionAlternative {
+    transcript: string;
+    confidence: number;
+}
+
+interface SpeechRecognitionResult {
+    length: number;
+    item(index: number): SpeechRecognitionAlternative;
+    final: boolean;
+}
+
+interface SpeechRecognitionResultList {
+    length: number;
+    item(index: number): SpeechRecognitionResult;
+}
+
+interface SpeechRecognitionEvent extends Event {
+    resultIndex: number;
+    results: SpeechRecognitionResultList;
+    interpretation: any;
+    emma: Document;
+}
+
+interface SpeechGrammar {
+    src: string;
+    weight: number;
+}
+interface SpeechGrammarStatic {
+    prototype: SpeechGrammar;
+    new (): SpeechGrammar;
+}
+declare var SpeechGrammar: SpeechGrammarStatic;
+declare var webkitSpeechGrammar: SpeechGrammarStatic;
+
+interface SpeechGrammarList {
+    length: number;
+    item(index: number): SpeechGrammar;
+    addFromURI(src: string, weight: number): void;
+    addFromString(string: string, weight: number): void;
+}
+interface SpeechGrammarListStatic {
+    prototype: SpeechGrammarList;
+    new (): SpeechGrammarList;
+}
+declare var SpeechGrammarList: SpeechGrammarListStatic;
+declare var webkitSpeechGrammarList: SpeechGrammarListStatic;
+
+interface SpeechSynthesis {
+    pending: boolean;
+    speaking: boolean;
+    paused: boolean;
+
+    speak(utterance: SpeechSynthesisUtterance): void;
+    cancel(): void;
+    pause(): void;
+    resume(): void;
+    getVoices(): SpeechSynthesisVoiceList;
+}
+
+interface SpeechSynthesisGetter {
+    speechSynthesis: SpeechSynthesis;
+}
+interface Window extends SpeechSynthesisGetter {
+}
+
+interface SpeechSynthesisUtterance extends EventTarget {
+    text: string;
+    lang: string;
+    voiceURI: string;
+    volume: number;
+    rate: number;
+    pitch: number;
+
+    onstart: (ev: SpeechSynthesisEvent) => any;
+    onend: (ev: SpeechSynthesisEvent) => any;
+    onerror: (ev: ErrorEvent) => any;
+    onpause: (ev: SpeechSynthesisEvent) => any;
+    onresume: (ev: SpeechSynthesisEvent) => any;
+    onmark: (ev: SpeechSynthesisEvent) => any;
+    onboundary: (ev: SpeechSynthesisEvent) => any;
+}
+interface SpeechSynthesisUtteranceStatic {
+    prototype: SpeechSynthesisUtterance;
+    new (): SpeechSynthesisUtterance;
+    new (text: string): SpeechSynthesisUtterance;
+}
+declare var SpeechSynthesisUtterance: SpeechSynthesisUtteranceStatic;
+
+interface SpeechSynthesisEvent extends Event {
+    charIndex: number;
+    elapsedTime: number;
+    name: string;
+}
+
+interface SpeechSynthesisVoice {
+    voiceURI: string;
+    name: string;
+    lang: string;
+    localService: boolean;
+    default: boolean;
+}
+
+interface SpeechSynthesisVoiceList {
+    length: number;
+    item(index: number): SpeechSynthesisVoice;
+}
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