Whenever changing the cursor, WebKit fires a mousemove event. This doesn't seem correct, or at least is inconsistent with other browsers as Firefox and Internet Explorer don't seem to exhibit this problem. If there's some documentation in the specification that states that this can happen, a pointer to that would be useful.
Steps to reproduce:
1. Load the JSFiddle at the URL above.
2. Click (to focus) on the Result area in the bottom right quadrant.
3. Type 'a' to cause a cursor change to "auto" and 's' to cause a cursor change to "move."
Result: Any time the cursor changes to a different style, a mousemove event is fired. Repeated calls to set the cursor style to the current style does not cause mousemove events.
Created attachment 196434 [details]
Attached a test case in case the jsfiddle is inaccessible.
*** This bug has been marked as a duplicate of bug 101857 ***
Mass move bugs into the DOM component.