diff --git a/features/bmp.yml b/features/bmp.yml
new file mode 100644
index 00000000000..43dacb3be03
--- /dev/null
+++ b/features/bmp.yml
@@ -0,0 +1,5 @@
+name: BMP
+description: The BMP image format is an uncompressed raster graphics file format. Also known as a bitmap.
+spec: https://www.rfc-editor.org/rfc/rfc7903#section-1.2
+compat_features:
+  - mediatypes.image.bmp
diff --git a/features/bmp.yml.dist b/features/bmp.yml.dist
new file mode 100644
index 00000000000..4e5fcbb44bd
--- /dev/null
+++ b/features/bmp.yml.dist
@@ -0,0 +1,17 @@
+# Generated from: bmp.yml
+# Do not edit this file by hand. Edit the source file instead!
+
+status:
+  baseline: high
+  baseline_low_date: 2015-07-29
+  baseline_high_date: 2018-01-29
+  support:
+    chrome: "1"
+    chrome_android: "18"
+    edge: "12"
+    firefox: "1"
+    firefox_android: "4"
+    safari: "1"
+    safari_ios: "1"
+compat_features:
+  - mediatypes.image.bmp
diff --git a/features/canvas.yml b/features/canvas.yml
index 3e22db4f252..c590e495135 100644
--- a/features/canvas.yml
+++ b/features/canvas.yml
@@ -13,7 +13,9 @@ compat_features:
   - api.HTMLCanvasElement.getContext
   - api.HTMLCanvasElement.height
   - api.HTMLCanvasElement.toBlob
+  - api.HTMLCanvasElement.toBlob.type_parameter_jpeg
   - api.HTMLCanvasElement.toDataURL
+  - api.HTMLCanvasElement.toDataURL.type_parameter_jpeg
   - api.HTMLCanvasElement.width
   - html.elements.canvas
   - html.elements.canvas.height
diff --git a/features/canvas.yml.dist b/features/canvas.yml.dist
index 92df1197e78..64e39bb3443 100644
--- a/features/canvas.yml.dist
+++ b/features/canvas.yml.dist
@@ -71,3 +71,5 @@ compat_features:
   #   safari: "11"
   #   safari_ios: "11"
   - api.HTMLCanvasElement.toBlob
+  - api.HTMLCanvasElement.toBlob.type_parameter_jpeg
+  - api.HTMLCanvasElement.toDataURL.type_parameter_jpeg
diff --git a/features/gif.yml b/features/gif.yml
new file mode 100644
index 00000000000..3067136431b
--- /dev/null
+++ b/features/gif.yml
@@ -0,0 +1,6 @@
+name: GIF
+description: The GIF (Graphics Interchange Format) image format is a raster graphics file format with animation and lossless compression.
+spec:
+  - https://www.w3.org/Graphics/GIF/spec-gif89a.txt#top
+compat_features:
+  - mediatypes.image.gif
diff --git a/features/gif.yml.dist b/features/gif.yml.dist
new file mode 100644
index 00000000000..d755662808b
--- /dev/null
+++ b/features/gif.yml.dist
@@ -0,0 +1,17 @@
+# Generated from: gif.yml
+# Do not edit this file by hand. Edit the source file instead!
+
+status:
+  baseline: high
+  baseline_low_date: 2015-07-29
+  baseline_high_date: 2018-01-29
+  support:
+    chrome: "1"
+    chrome_android: "18"
+    edge: "12"
+    firefox: "1"
+    firefox_android: "4"
+    safari: "1"
+    safari_ios: "1"
+compat_features:
+  - mediatypes.image.gif
diff --git a/features/jpeg.yml b/features/jpeg.yml
new file mode 100644
index 00000000000..6ba916475c6
--- /dev/null
+++ b/features/jpeg.yml
@@ -0,0 +1,5 @@
+name: JPEG
+description: The JPEG image format is a raster graphics file format with lossy compression.
+spec: https://jpeg.org/jpeg/#content
+compat_features:
+  - mediatypes.image.jpeg
diff --git a/features/jpeg.yml.dist b/features/jpeg.yml.dist
new file mode 100644
index 00000000000..944f05249cb
--- /dev/null
+++ b/features/jpeg.yml.dist
@@ -0,0 +1,17 @@
+# Generated from: jpeg.yml
+# Do not edit this file by hand. Edit the source file instead!
+
+status:
+  baseline: high
+  baseline_low_date: 2015-07-29
+  baseline_high_date: 2018-01-29
+  support:
+    chrome: "1"
+    chrome_android: "18"
+    edge: "12"
+    firefox: "1"
+    firefox_android: "4"
+    safari: "1"
+    safari_ios: "1"
+compat_features:
+  - mediatypes.image.jpeg
diff --git a/scripts/specs.ts b/scripts/specs.ts
index b094b06f2d6..732782148ae 100644
--- a/scripts/specs.ts
+++ b/scripts/specs.ts
@@ -199,6 +199,14 @@ const defaultAllowlist: allowlistItem[] = [
     [
         "http://webmachinelearning.github.io/prompt-api/",
         "Allowed because that's where LanguageModel (aka Prompt API) spec currently lives."
+    ],
+    [
+        "https://jpeg.org/jpeg/#content",
+        "Allowed because it's a spec not tracked in web-specs."
+    ],
+    [
+        "https://www.rfc-editor.org/rfc/rfc7903#section-1.2",
+        "Allowed because it's a spec not tracked in web-specs."
     ]
 ];