• Before JS can update an element, it needs to say which element to change
• The document global object has a bunch of methods for finding things
• document.getElementById("abc") - Gets a reference to an element with id "abc"
• document.getElementsByClassName("c") - Gets all elements with class "c"
• document.querySelector("#a") - Finds a single element using a CSS selector
• document.querySelectorAll("header div") - Finds all elements matching a CSS selector

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