Html DOM
From wikinotes
Query/Manipulate an HTML page from javascript using it's DOM (domain-object-model).
Documentation
DOM docs https://developer.mozilla.org/en-US/docs/Web/API/Document_Object_Model
Examples
You can select items from javascript using css selectors.
document.querySelector('div.foo-class'); // find items by CSS-selector document.getElementById('foo-id'); // find element with ID document.getElementsByClassName('foo-class'); // find elements with class