Learning notes and hand-ons for Udacity course JavaScript and the DOM. JavaScript is an extremely powerful programming language. One place where its power truly shines is using it to control a web ...

The DOM Tree The DOM created by the browser while loading the web page is represented as a tree of elements. The document is the root element of the DOM tree which represents the HTML document. With ...

A DOM Element Selector An attempt at something similar to the CSS element selectors and the JavaScript document.querySelectorAll() method.

Great power, however, comes with great responsibility. Abusing JavaScript and handling DOM manipulation incorrectly can cause difficulties with maintainability, performance, and user experience.