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Why can't a person use .add() instead of .append()?
Using .append() works, but I was just wondering why .add() doesn't. It seems to me that they should be equivalent. I don't understand the difference between the two.
In jQuery, add and append do very different things. The add method adds an element or a set of elements to a jQuery object so that you can perform further actions. The append method appends an element or a set of elements to an element in the document itself. Think of the add method as a way of being able to add in other elements to an object and append as a way of appending other elements to the document/page itself.
Here is the article for jQuery's add: https://api.jquery.com/add/
Here is the article for append: http://api.jquery.com/append/