webdriver 0.40.2

Library implementing the wire protocol for the W3C WebDriver specification.
Documentation 
macro_rules! try_opt {
    ($expr:expr, $err_type:expr, $err_msg:expr) => {{
        match $expr {
            Some(x) => x,
            None => return Err(WebDriverError::new($err_type, $err_msg)),
        }
    }};
}