src/third_party/web_platform_tests/WebIDL/valid/idl/reg-operations.widl

// Extracted from http://dev.w3.org/2006/webapi/WebIDL/ on 2011-05-06
interface Dimensions {
  attribute unsigned long width;
  attribute unsigned long height;
};

exception NoPointerDevice { };

interface Button {

  // An operation that takes no arguments, returns a boolean
  boolean isMouseOver();

  // Overloaded operations.
  void setDimensions(Dimensions size);
  void setDimensions(unsigned long width, unsigned long height);
};