This trigger will fire once the visitor clicks on one of the elements specified in the selector settings.
CSS Selectors - The list of CSS selectors of the elements that when clicked should fire the trigger. To learn more about CSS selectors consult this MDN article.
Max scroll reached - this condition will check whether the maximum scroll percent during this pageview is higher or lower than the given value in percent. Time spent - this condition will check whether the time in seconds spent on the current page is more or less than the given value in seconds.