KievII Host (GitHub: janesconference / KievIIHost, License: MIT) by Cristiano Belloni is an audio plugin host based on the Web Audio API. The plugins are loaded dynamically using RequireJS from a GitHub repository, and already include lots of cool effects like a phaser, wah-wah, and pitch shift.
If you want to try out the KievII demo, which is a lot of fun, you'll need Chrome and to enable Web Audio Input in
chrome://flags. I tested it in Chrome 25 on a Mac and it ran pretty solidly. It allows audio to be routed from the mic through various effects, and there's also a sample player with a keyboard for triggering audio samples at different pitches.
There's more information about KievII at kievii.net, which has a demo of a step sequencer.
Shawn Jansepar sent in his post at the Mozilla Hacks blog, called Capturing - Improving Performance of the Adaptive Web, about a client-side API he's developed called Capturing:
Our approach to give you resource control is done by capturing the source markup before it has a chance to be parsed by the browser, and then reconstructing the document with resources disabled.
The ability to control resources client-side gives you an unprecedented amount of control over the performance of your website.
Capturing was a key feature of Mobify.js 1.1, our framework for creating mobile and tablet websites using client-side templating. We have since reworked Mobify.js in our 2.0 release to be a much more modular library that can be used in any existing website, with Capturing as the primary focus.
One example Shawn uses is using a polyfill for the
picture element, which only includes an extra
The goal of Mobify.js is to help existing sites better support mobile devices. The examples included are the
picture polyfill mentioned above, using media queries, and templating.