2.2.47 [HTML] Section 17.12.2, Read-only controls

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C0046:

The specification states:

 When set, the readonly attribute has the following effects on an element:
  
 Read-only elements receive focus but cannot be modified by the user. 
  
 Read-only elements are included in tabbing navigation. 
  
 Read-only elements may be successful.

All Document Modes (Internet Explorer 7)

While read-only controls are included in tabbing navigation and can receive focus, the user interface does not indicate that the control is read-only.