2.1.90 [W3C-HTML51] Section 5.7.8 The dropzone attribute

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V0409: The dropzone attribute is not supported

The specification states:

 5.7.5. Drag-and-drop processing model
  
     When the user attempts to begin a drag operation, the user agent must run the 
     following steps. ...
  
 5.7.8 The dropzone attribute
  
     All html elements may have the dropzone content attribute set. ...

EdgeHTML Mode

The dropzone attribute is not supported.