Svelte is a radical new approach to building user interfaces. Whereas traditional frameworks like React and Vue do the bulk of their work in the browser, Svelte shifts that work into a compile step that happens when you build your app.

Instead of using techniques like virtual DOM diffing, Svelte writes code that surgically updates the DOM when the state of your app changes.

Some critics haven't grasped the coolness of : search ALL the docs, offline, in browser. Disconnect wifi, still works

DOM Snitch is an experimental Chrome extension that enables developers and testers to identify insecure practices commonly found in client-side code.

A Javascript CSS3 Selector and Matcher not using XPath

Firediff is a Firebug extension that tracks changes to a pages DOM and CSS.

DOM Storage is designed to provide a larger, securer, and easier-to-use alternative to storing information in cookies. It is currently only available in Mozilla-based browsers, notably starting with Firefox 2. [and IE8, Safari]