def allow_native_xpath(self,allow):
self.do_command("<STR_LIT>", [allow,])<EOL>
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.
Using the pure-JS xpath library can improve the consistency of xpath
element locators between different browser vendors, but the pure-JS
version is much slower than the native implementations.

'allow' is boolean, true means we'll prefer to use native XPath; false means we'll only use JS XPath