diff --git a/baselines/dom.generated.d.ts b/baselines/dom.generated.d.ts
index 3c8af43e8..723f7f414 100644
--- a/baselines/dom.generated.d.ts
+++ b/baselines/dom.generated.d.ts
@@ -16042,6 +16042,17 @@ interface WEBGL_compressed_texture_astc {
     readonly COMPRESSED_SRGB8_ALPHA8_ASTC_8x8_KHR: GLenum;
 }
 
+interface WEBGL_compressed_texture_etc1 {
+    readonly COMPRESSED_RGB_ETC1_WEBGL: GLenum;
+}
+
+interface WEBGL_compressed_texture_pvrtc {
+    readonly COMPRESSED_RGBA_PVRTC_2BPPV1_IMG: GLenum;
+    readonly COMPRESSED_RGBA_PVRTC_4BPPV1_IMG: GLenum;
+    readonly COMPRESSED_RGB_PVRTC_2BPPV1_IMG: GLenum;
+    readonly COMPRESSED_RGB_PVRTC_4BPPV1_IMG: GLenum;
+}
+
 /** The WEBGL_compressed_texture_s3tc extension is part of the WebGL API and exposes four S3TC compressed texture formats. */
 interface WEBGL_compressed_texture_s3tc {
     readonly COMPRESSED_RGBA_S3TC_DXT1_EXT: GLenum;
diff --git a/baselines/webworker.generated.d.ts b/baselines/webworker.generated.d.ts
index 378670cad..a715edfa4 100644
--- a/baselines/webworker.generated.d.ts
+++ b/baselines/webworker.generated.d.ts
@@ -3291,6 +3291,17 @@ interface WEBGL_compressed_texture_astc {
     readonly COMPRESSED_SRGB8_ALPHA8_ASTC_8x8_KHR: GLenum;
 }
 
+interface WEBGL_compressed_texture_etc1 {
+    readonly COMPRESSED_RGB_ETC1_WEBGL: GLenum;
+}
+
+interface WEBGL_compressed_texture_pvrtc {
+    readonly COMPRESSED_RGBA_PVRTC_2BPPV1_IMG: GLenum;
+    readonly COMPRESSED_RGBA_PVRTC_4BPPV1_IMG: GLenum;
+    readonly COMPRESSED_RGB_PVRTC_2BPPV1_IMG: GLenum;
+    readonly COMPRESSED_RGB_PVRTC_4BPPV1_IMG: GLenum;
+}
+
 /** The WEBGL_compressed_texture_s3tc extension is part of the WebGL API and exposes four S3TC compressed texture formats. */
 interface WEBGL_compressed_texture_s3tc {
     readonly COMPRESSED_RGBA_S3TC_DXT1_EXT: GLenum;
diff --git a/inputfiles/idl/WebGL WEBGL_compressed_texture_etc1.widl b/inputfiles/idl/WebGL WEBGL_compressed_texture_etc1.widl
new file mode 100644
index 000000000..2be65d9e0
--- /dev/null
+++ b/inputfiles/idl/WebGL WEBGL_compressed_texture_etc1.widl	
@@ -0,0 +1,5 @@
+[Exposed=(Window,Worker), LegacyNoInterfaceObject]
+interface WEBGL_compressed_texture_etc1 {
+    /* Compressed Texture Format */
+    const GLenum COMPRESSED_RGB_ETC1_WEBGL = 0x8D64; 
+};
diff --git a/inputfiles/idl/WebGL WEBGL_compressed_texture_pvrtc.widl b/inputfiles/idl/WebGL WEBGL_compressed_texture_pvrtc.widl
new file mode 100644
index 000000000..f17aced3a
--- /dev/null
+++ b/inputfiles/idl/WebGL WEBGL_compressed_texture_pvrtc.widl	
@@ -0,0 +1,8 @@
+[Exposed=(Window,Worker), LegacyNoInterfaceObject]
+interface WEBGL_compressed_texture_pvrtc {
+    /* Compressed Texture Formats */
+    const GLenum COMPRESSED_RGB_PVRTC_4BPPV1_IMG      = 0x8C00;
+    const GLenum COMPRESSED_RGB_PVRTC_2BPPV1_IMG      = 0x8C01;
+    const GLenum COMPRESSED_RGBA_PVRTC_4BPPV1_IMG     = 0x8C02;
+    const GLenum COMPRESSED_RGBA_PVRTC_2BPPV1_IMG     = 0x8C03;
+};
diff --git a/inputfiles/idlSources.json b/inputfiles/idlSources.json
index a52edd252..9addded7f 100644
--- a/inputfiles/idlSources.json
+++ b/inputfiles/idlSources.json
@@ -626,6 +626,14 @@
         "url": "https://www.khronos.org/registry/webgl/extensions/WEBGL_compressed_texture_s3tc_srgb/",
         "title": "WebGL WEBGL_compressed_texture_s3tc_srgb"
     },
+    {
+        "url": "https://www.khronos.org/registry/webgl/extensions/WEBGL_compressed_texture_pvrtc/",
+        "title": "WebGL WEBGL_compressed_texture_pvrtc"
+    },
+    {
+        "url": "https://www.khronos.org/registry/webgl/extensions/WEBGL_compressed_texture_etc1/",
+        "title": "WebGL WEBGL_compressed_texture_etc1"
+    },
     {
         "url": "https://www.khronos.org/registry/webgl/extensions/WEBGL_debug_renderer_info/",
         "title": "WebGL WEBGL_debug_renderer_info"