Dartpad has added a new button to copy the code snippet from the dartpad. When I try to copy it by clicking on the button, it shows a permission error in the dartpad console (See the image attached below).

How to reproduce

• Go to this docs page https://api.flutter.dev/flutter/widgets/Draggable-class.html#widgets.Draggable.1
• Focus on the Dartpad example
• Click on the "Copy" button
• Observe error in the dartpad console as well as the web console.

Error images

• Copying text using the button shows an error in console.

Fix

• This can simply be fixed by adding allow attribute to the iframe embed with the permission clipboard-write.
• I am working on raising a PR with the fix.