Changes

# "User agents may prompt for confirmation before locking, this preference may be saved as a content setting" How to deal with this? What UI do we use? See also, "Repeated escapes of mouse lock can signal user agent to not re-lock the mouse without more specific user intent gesture, e.g. similar to how Chrome suppresses repeated alert() calls"

# User agents may prompt for confirmation before locking, this preference may be saved as a content setting (Mentioned in class by humphd, setting would be in about:config ) mjschranz

# "The Mouse Lock API must exit the mouse lock state if the user agent, window, or tab loses focus"

# Clip the mouse so it doesn't leave the locked element with a mouse movement large enough to exceed its bounds. See:

## [http://developer.apple.com/library/mac/#documentation/GraphicsImaging/Reference/Quartz_Services_Ref/Reference/reference.html CGAssociateMouseAndMouseCursorPosition and CGGetLastMouseDelta] on OS X

## [http://www.x.org/archive/X11R6.8.2/doc/XGrabPointer.3.html XGrabPointer] on Linux

====Tests====