function title() {
    return this.requestHandler.create('/session/:sessionId/title');
}
Gets an object containing the current page title.

<example>
    :title.js
    it('should return title using protocol command', function () {
        browser.url('http://webdriver.io');

        var title = browser.title();
        console.log(title);
        // outputs the following:
        //  {
        //      state: 'success',
        //      sessionId: '0c49951c-eb15-4053-96af-c1ebc79fb8b7',
        //      hCode: 388233301,
        //      value: 'WebdriverIO - WebDriver bindings for Node.js',
        //      class: 'org.openqa.selenium.remote.Response',
        //      status: 0
        //  }
    });
</example>

@return {String} The current page title.

@see  https://w3c.github.io/webdriver/webdriver-spec.html#get-title
@type protocol