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Adam Bradley: Foresight.js
Foresight.js gives webpages the ability to tell if the user's device is capable of viewing high-resolution images (such as the 3rd generation iPad) before the image has been requested from the server. Additionally, it judges if the user's device currently has a fast enough network connection for high-resolution images. Depending on device display and network connectivity, foresight.js will request the appropriate image for the webpage. By customizing the img src attribute using methods such as URI templates, or finding and replacing values within the URI, it is able to form requests built for your image's resolution variants. Media queries however, could be used when dealing with CSS background-images, while foresight.js is used to handle inline img elements (or until current web standards are improved). Recently Washington Post implemented foresight.js to determine hi-res/responsive images on their mobile site.
Ryan Niemeyer: Knockout.js