function clear(browser) {
    browser
        .useCss()
        .click("#clr-recipe")
        .click("#clr-io")
        .waitForElementNotPresent("#rec-list li.operation")
        .expect.element("#input-text .cm-content").text.that.equals("");
}
@function
Clears the recipe and input

@param {Browser} browser - Nightwatch client