[JavaScript][jQuery] Checking for the existence of DOM elements

Six ways to check DOM element existence in JavaScript and jQuery, ranked by execution speed.

[JavaScript][jQuery] How to Get DOM Elements

How to get a raw DOM Element from a jQuery object with .get(0), alongside the vanilla getElementById equivalent.

[JavaScript] Remove All Elements with Specified ID or Class Name

Pure JavaScript functions to remove DOM elements by id or class name, no jQuery required.

[JavaScript] How to Fix the Problem Where removeEventListener Cannot Remove Events

Why removeEventListener silently fails when the listener is redefined, and how to fix it by lifting the listener out.