diff --git a/baselines/audioworklet.generated.d.ts b/baselines/audioworklet.generated.d.ts
index 48abe08d0..24bc08131 100644
--- a/baselines/audioworklet.generated.d.ts
+++ b/baselines/audioworklet.generated.d.ts
@@ -282,7 +282,7 @@ interface CompressionStream extends GenericTransformStream {
 
 declare var CompressionStream: {
     prototype: CompressionStream;
-    new(format: string): CompressionStream;
+    new(format: CompressionFormat): CompressionStream;
 };
 
 /**
@@ -402,7 +402,7 @@ interface DecompressionStream extends GenericTransformStream {
 
 declare var DecompressionStream: {
     prototype: DecompressionStream;
-    new(format: string): DecompressionStream;
+    new(format: CompressionFormat): DecompressionStream;
 };
 
 /**
@@ -1393,5 +1393,6 @@ type ReadableStreamController<T> = ReadableStreamDefaultController<T> | Readable
 type ReadableStreamReadResult<T> = ReadableStreamReadValueResult<T> | ReadableStreamReadDoneResult<T>;
 type ReadableStreamReader<T> = ReadableStreamDefaultReader<T> | ReadableStreamBYOBReader;
 type Transferable = MessagePort | ReadableStream | WritableStream | TransformStream | ArrayBuffer;
+type CompressionFormat = "deflate" | "deflate-raw" | "gzip";
 type ReadableStreamReaderMode = "byob";
 type ReadableStreamType = "bytes";
diff --git a/baselines/dom.generated.d.ts b/baselines/dom.generated.d.ts
index 5d224f707..72caa46eb 100644
--- a/baselines/dom.generated.d.ts
+++ b/baselines/dom.generated.d.ts
@@ -1501,19 +1501,18 @@ interface RTCRtpCapabilities {
     headerExtensions: RTCRtpHeaderExtensionCapability[];
 }
 
-interface RTCRtpCodecCapability {
+interface RTCRtpCodec {
     channels?: number;
     clockRate: number;
     mimeType: string;
     sdpFmtpLine?: string;
 }
 
-interface RTCRtpCodecParameters {
-    channels?: number;
-    clockRate: number;
-    mimeType: string;
+interface RTCRtpCodecCapability extends RTCRtpCodec {
+}
+
+interface RTCRtpCodecParameters extends RTCRtpCodec {
     payloadType: number;
-    sdpFmtpLine?: string;
 }
 
 interface RTCRtpCodingParameters {
@@ -1537,7 +1536,7 @@ interface RTCRtpEncodingParameters extends RTCRtpCodingParameters {
 }
 
 interface RTCRtpHeaderExtensionCapability {
-    uri?: string;
+    uri: string;
 }
 
 interface RTCRtpHeaderExtensionParameters {
@@ -5690,7 +5689,7 @@ interface CompressionStream extends GenericTransformStream {
 
 declare var CompressionStream: {
     prototype: CompressionStream;
-    new(format: string): CompressionStream;
+    new(format: CompressionFormat): CompressionStream;
 };
 
 /** [MDN Reference](https://developer.mozilla.org/docs/Web/API/ConstantSourceNode) */
@@ -6564,7 +6563,7 @@ interface DecompressionStream extends GenericTransformStream {
 
 declare var DecompressionStream: {
     prototype: DecompressionStream;
-    new(format: string): DecompressionStream;
+    new(format: CompressionFormat): DecompressionStream;
 };
 
 /**
@@ -27813,6 +27812,7 @@ type ColorGamut = "p3" | "rec2020" | "srgb";
 type ColorSpaceConversion = "default" | "none";
 type CompositeOperation = "accumulate" | "add" | "replace";
 type CompositeOperationOrAuto = "accumulate" | "add" | "auto" | "replace";
+type CompressionFormat = "deflate" | "deflate-raw" | "gzip";
 type CredentialMediationRequirement = "conditional" | "optional" | "required" | "silent";
 type DOMParserSupportedType = "application/xhtml+xml" | "application/xml" | "image/svg+xml" | "text/html" | "text/xml";
 type DirectionSetting = "" | "lr" | "rl";
diff --git a/baselines/serviceworker.generated.d.ts b/baselines/serviceworker.generated.d.ts
index 9dc39be11..4d3106d9b 100644
--- a/baselines/serviceworker.generated.d.ts
+++ b/baselines/serviceworker.generated.d.ts
@@ -1606,7 +1606,7 @@ interface CompressionStream extends GenericTransformStream {
 
 declare var CompressionStream: {
     prototype: CompressionStream;
-    new(format: string): CompressionStream;
+    new(format: CompressionFormat): CompressionStream;
 };
 
 /**
@@ -2057,7 +2057,7 @@ interface DecompressionStream extends GenericTransformStream {
 
 declare var DecompressionStream: {
     prototype: DecompressionStream;
-    new(format: string): DecompressionStream;
+    new(format: CompressionFormat): DecompressionStream;
 };
 
 /** [MDN Reference](https://developer.mozilla.org/docs/Web/API/EXT_blend_minmax) */
@@ -8411,6 +8411,7 @@ type CanvasTextRendering = "auto" | "geometricPrecision" | "optimizeLegibility"
 type ClientTypes = "all" | "sharedworker" | "window" | "worker";
 type ColorGamut = "p3" | "rec2020" | "srgb";
 type ColorSpaceConversion = "default" | "none";
+type CompressionFormat = "deflate" | "deflate-raw" | "gzip";
 type DocumentVisibilityState = "hidden" | "visible";
 type EndingType = "native" | "transparent";
 type FileSystemHandleKind = "directory" | "file";
diff --git a/baselines/sharedworker.generated.d.ts b/baselines/sharedworker.generated.d.ts
index 6e26436b1..ba4b8bd52 100644
--- a/baselines/sharedworker.generated.d.ts
+++ b/baselines/sharedworker.generated.d.ts
@@ -1533,7 +1533,7 @@ interface CompressionStream extends GenericTransformStream {
 
 declare var CompressionStream: {
     prototype: CompressionStream;
-    new(format: string): CompressionStream;
+    new(format: CompressionFormat): CompressionStream;
 };
 
 /**
@@ -1984,7 +1984,7 @@ interface DecompressionStream extends GenericTransformStream {
 
 declare var DecompressionStream: {
     prototype: DecompressionStream;
-    new(format: string): DecompressionStream;
+    new(format: CompressionFormat): DecompressionStream;
 };
 
 /** [MDN Reference](https://developer.mozilla.org/docs/Web/API/EXT_blend_minmax) */
@@ -8419,6 +8419,7 @@ type CanvasTextRendering = "auto" | "geometricPrecision" | "optimizeLegibility"
 type ClientTypes = "all" | "sharedworker" | "window" | "worker";
 type ColorGamut = "p3" | "rec2020" | "srgb";
 type ColorSpaceConversion = "default" | "none";
+type CompressionFormat = "deflate" | "deflate-raw" | "gzip";
 type EndingType = "native" | "transparent";
 type FileSystemHandleKind = "directory" | "file";
 type FontDisplay = "auto" | "block" | "fallback" | "optional" | "swap";
diff --git a/baselines/webworker.generated.d.ts b/baselines/webworker.generated.d.ts
index 9ebeff35e..ee1a363df 100644
--- a/baselines/webworker.generated.d.ts
+++ b/baselines/webworker.generated.d.ts
@@ -1743,7 +1743,7 @@ interface CompressionStream extends GenericTransformStream {
 
 declare var CompressionStream: {
     prototype: CompressionStream;
-    new(format: string): CompressionStream;
+    new(format: CompressionFormat): CompressionStream;
 };
 
 /**
@@ -2194,7 +2194,7 @@ interface DecompressionStream extends GenericTransformStream {
 
 declare var DecompressionStream: {
     prototype: DecompressionStream;
-    new(format: string): DecompressionStream;
+    new(format: CompressionFormat): DecompressionStream;
 };
 
 interface DedicatedWorkerGlobalScopeEventMap extends WorkerGlobalScopeEventMap {
@@ -9096,6 +9096,7 @@ type ClientTypes = "all" | "sharedworker" | "window" | "worker";
 type CodecState = "closed" | "configured" | "unconfigured";
 type ColorGamut = "p3" | "rec2020" | "srgb";
 type ColorSpaceConversion = "default" | "none";
+type CompressionFormat = "deflate" | "deflate-raw" | "gzip";
 type DocumentVisibilityState = "hidden" | "visible";
 type EncodedVideoChunkType = "delta" | "key";
 type EndingType = "native" | "transparent";
diff --git a/package-lock.json b/package-lock.json
index 4c232191c..0174566e0 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -720,9 +720,9 @@
       }
     },
     "node_modules/@webref/css": {
-      "version": "6.4.4",
-      "resolved": "https://registry.npmjs.org/@webref/css/-/css-6.4.4.tgz",
-      "integrity": "sha512-NG5enh79U4j3s0xLZH5sbjXGqqQkWK+AfJJ9NvN3Ui5lWkJBh1JVASipa00qQicO0qNV8LUFmuzeONswnbCJHw==",
+      "version": "6.4.5",
+      "resolved": "https://registry.npmjs.org/@webref/css/-/css-6.4.5.tgz",
+      "integrity": "sha512-fSaX6MulcMp2YnVdREFduusqs2tNCM3PuEFS7hW8ekwBKPUYQRf+lKxGtojLc7yT0qaq+zF0koGC3a2AIFj5tQ==",
       "dev": true,
       "peerDependencies": {
         "css-tree": "^2.3.1"
@@ -735,9 +735,9 @@
       "dev": true
     },
     "node_modules/@webref/idl": {
-      "version": "3.30.0",
-      "resolved": "https://registry.npmjs.org/@webref/idl/-/idl-3.30.0.tgz",
-      "integrity": "sha512-NUK99HCEW3bQ0oMkZFXUOU56VpFp4klvOMcsp5JoIgXuurpw/I+KZ+wzgYBNOHpKM1VZba9rS/EYy88xRGdneQ==",
+      "version": "3.31.0",
+      "resolved": "https://registry.npmjs.org/@webref/idl/-/idl-3.31.0.tgz",
+      "integrity": "sha512-fnDT+j16lLXV1fG+CujhAeTe3OJ9jKfMD7L+Jr4oCbqkit9lTlORU1ktzqr+CScN9/Wxzt1kuzD7cpcondW+xA==",
       "dev": true,
       "peerDependencies": {
         "webidl2": "^24.2.2"
@@ -4382,9 +4382,9 @@
       }
     },
     "@webref/css": {
-      "version": "6.4.4",
-      "resolved": "https://registry.npmjs.org/@webref/css/-/css-6.4.4.tgz",
-      "integrity": "sha512-NG5enh79U4j3s0xLZH5sbjXGqqQkWK+AfJJ9NvN3Ui5lWkJBh1JVASipa00qQicO0qNV8LUFmuzeONswnbCJHw==",
+      "version": "6.4.5",
+      "resolved": "https://registry.npmjs.org/@webref/css/-/css-6.4.5.tgz",
+      "integrity": "sha512-fSaX6MulcMp2YnVdREFduusqs2tNCM3PuEFS7hW8ekwBKPUYQRf+lKxGtojLc7yT0qaq+zF0koGC3a2AIFj5tQ==",
       "dev": true,
       "requires": {}
     },
@@ -4395,9 +4395,9 @@
       "dev": true
     },
     "@webref/idl": {
-      "version": "3.30.0",
-      "resolved": "https://registry.npmjs.org/@webref/idl/-/idl-3.30.0.tgz",
-      "integrity": "sha512-NUK99HCEW3bQ0oMkZFXUOU56VpFp4klvOMcsp5JoIgXuurpw/I+KZ+wzgYBNOHpKM1VZba9rS/EYy88xRGdneQ==",
+      "version": "3.31.0",
+      "resolved": "https://registry.npmjs.org/@webref/idl/-/idl-3.31.0.tgz",
+      "integrity": "sha512-fnDT+j16lLXV1fG+CujhAeTe3OJ9jKfMD7L+Jr4oCbqkit9lTlORU1ktzqr+CScN9/Wxzt1kuzD7cpcondW+xA==",
       "dev": true,
       "requires": {}
     },