2.1.6 [W3C-POINTERLOCK] Section 8.1 Dictionary MouseEventInit Members

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V0005: The extensions to MouseEventInit are not supported

The specification states:

 8. Extensions to the MouseEventInit Dictionary
  
 User agents must extend the MouseEventInit dictionary [UIEVENTS] with two members 
 movementX and movementY used to initialize respective members of MouseEvent.
  
     partial dictionary MouseEventInit {
         long movementX = 0;
         long movementY = 0;
     };
  
 8.1 Dictionary MouseEventInit Members
  
     movementX of type long, defaulting to 0
     movementY of type long, defaulting to 0

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The extensions to MouseEventInit are not supported.