Add iframe parameter for Chromium

content/guides/embed/box-embed.md

@@ -75,12 +75,23 @@ If you want to customize Box Embed even further, you can do it programmatically.
   width="{pixels}"
   height="{pixels}"
   frameborder="0"
+  allow="local-network-access; clipboard-read; clipboard-write"
   allowfullscreen
   webkitallowfullscreen
-  msallowfullscreen
-></iframe>
+  msallowfullscreen>
+</iframe>
 ```
 
+### Browser permissions
+
+The `allow` attribute enables clipboard operations and local network access for Google Chrome 142 and above and Microsoft Edge 143 and above. While designed for these browser versions, this attribute can be safely included for all browsers. Other browsers will ignore it.
+
+Without this attribute, embedded Box content might not work correctly with Box Tools, Device Trust, or the clipboard copy button.
+
+<Message type='notice'>
+The Embed Widget Link Generation modal automatically includes this parameter in the generated code.
+</Message>
+
 ### Finding your shared link value
 
 The first step to building an embed `iframe` programmatically is to generate