diff --git a/index.src.html b/index.src.html
index 3e5fe053..b3151e38 100644
--- a/index.src.html
+++ b/index.src.html
@@ -1674,8 +1674,8 @@
 <xmp class='idl'>
 dictionary AudioDecoderConfig {
   required DOMString codec;
-  [EnforceRange] required unsigned long sampleRate;
-  [EnforceRange] required unsigned long numberOfChannels;
+  required [EnforceRange] unsigned long sampleRate;
+  required [EnforceRange] unsigned long numberOfChannels;
   BufferSource description;
 };
 </xmp>
@@ -1850,8 +1850,8 @@
 <xmp class='idl'>
 dictionary VideoEncoderConfig {
   required DOMString codec;
-  [EnforceRange] required unsigned long width;
-  [EnforceRange] required unsigned long height;
+  required [EnforceRange] unsigned long width;
+  required [EnforceRange] unsigned long height;
   [EnforceRange] unsigned long displayWidth;
   [EnforceRange] unsigned long displayHeight;
   [EnforceRange] unsigned long long bitrate;
@@ -2207,7 +2207,7 @@
 
 dictionary EncodedAudioChunkInit {
   required EncodedAudioChunkType type;
-  [EnforceRange] required long long timestamp;    // microseconds
+  required [EnforceRange] long long timestamp;    // microseconds
   [EnforceRange] unsigned long long duration;     // microseconds
   required BufferSource data;
 };
@@ -2279,7 +2279,7 @@
 
 dictionary EncodedVideoChunkInit {
   required EncodedVideoChunkType type;
-  [EnforceRange] required long long timestamp;        // microseconds
+  required [EnforceRange] long long timestamp;        // microseconds
   [EnforceRange] unsigned long long duration;         // microseconds
   required BufferSource data;
 };
@@ -2427,9 +2427,9 @@
 dictionary AudioDataInit {
   required AudioSampleFormat format;
   required float sampleRate;
-  [EnforceRange] required unsigned long numberOfFrames;
-  [EnforceRange] required unsigned long numberOfChannels;
-  [EnforceRange] required long long timestamp;  // microseconds
+  required [EnforceRange] unsigned long numberOfFrames;
+  required [EnforceRange] unsigned long numberOfChannels;
+  required [EnforceRange] long long timestamp;  // microseconds
   required BufferSource data;
 };
 </xmp>
@@ -2708,7 +2708,7 @@
 
 <xmp class='idl'>
 dictionary AudioDataCopyToOptions {
-  [EnforceRange] required unsigned long planeIndex;
+  required [EnforceRange] unsigned long planeIndex;
   [EnforceRange] unsigned long frameOffset = 0;
   [EnforceRange] unsigned long frameCount;
   AudioSampleFormat format;
@@ -3858,8 +3858,8 @@
 
 <xmp class='idl'>
 dictionary PlaneLayout {
-  [EnforceRange] required unsigned long offset;
-  [EnforceRange] required unsigned long stride;
+  required [EnforceRange] unsigned long offset;
+  required [EnforceRange] unsigned long stride;
 };
 </xmp>