Specifies whether Selenium should use the native in-browser implementation
of XPath (if any native version is available); if you pass "false" to
this function, we will always use our pure-JavaScript xpath library.
By default, Selenium's overridden window.confirm() function will
return true, as if the user had manually clicked OK; after running
this command, the next call to confirm() will return false, as if
the user had clicked Cancel.