Why this and not $(this) in jQuery plugins

Question

The docs tell us:

Let\'s say we want to create a plugin that makes text within a set of retrieved elements green. All we have to do is add a functio

Answer 1

Don't we use $(el).css() to normally set CSS in jQuery?

Yes, when in the context of an element.

However in

$.fn.greenify = function() {
    // 'this' is a jQuery object at this point - with all the jQuery functions
    this.css( "color", "green" );
};

greenify is part of the same object that has the css function.

Somewhere else, there is a

$.fn.css = function() {
       ...
    };

Both css and greenify are part of the prototype($.fn)

See jQuery: What's the difference between '$(this)' and 'this'? and https://remysharp.com/2007/04/12/jquerys-this-demystified