getSource = function getSource() {
    return this.unify(this.source(), {
        extractValue: true
    });
}
Get source code of the page. This command won't work in mobile environments for native apps. If you are running
hybrid tests make sure that you are in the webview before calling this command.

<example>
    :getSource.js
    it('should get the source of the html document', function () {
        browser.url('http://webdriver.io');

        var source = browser.getSource();
        console.log(source); // outputs: "<!DOCTYPE html>\n<title>Webdriver.io</title>..."
    });
</example>

@alias browser.getSource
@return {String} source code of current website
@uses protocol/source
@type property