Any option that is set to “default” will not add code to the CSS file so that it does not become needlessly bloated. Additionally, if the element selector field is left blank, no code will be added the CSS file at all (even if some options have been changed).
If the element selector field is set to “[this]”, a random unique class name will be generated, added to the HTML element, and all non-default settings will only apply to the same element.
The element selector field accepts class names, IDs, and HTML. The selector can be as simple as single class name (.myClass) or as specific as you need it to be (html body div#pagewrap ul#myList li.myClass).