document.getElementById vs jQuery $()

are they equal?

Not exactly!!

document.getElementById('contents'); //returns a HTML DOM Object

var contents = $('#contents');  //returns a jQuery Object

In jQuery, to get the same result as document.getElementById, you can access the jQuery Object and get the first element in the object (Remember JavaScript objects act similar to associative arrays).

var contents = $('#contents')[0]; //returns a HTML DOM Object

Reference

https://stackoverflow.com/questions/4069982/document-getelementbyid-vs-jquery

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