This could be an amazing tool for anyone developing JavaScript. “Proxino catches Javascript exceptions in scripts we dynamically proxy. We notify you about these exceptions over email and through our dashboard.” They also minify and serve JS, which is far less important to my mind.
JavaScript
spin.js
A configurable loading spinner that’s smaller than an animated gif, built purely with JavaScript and CSS.
FlexSlider
A “fully responsive jQuery slider plugin.” via @adammccombs
jQuery.fracs
“determines the fraction of an HTML element that is currently in the viewport, as well as the fraction it takes of the complete viewport and the fraction of the area that might possibly be visible. It also provides the coordinates of the visible rectangle in document, element and viewport space.”
Anatomy of a HTML5 Mobile App
A comprehensive view of the process and resource needs for building a cross-platform HTML 5 Web app, broken down by the key components. The anatomy diagram provides an excellent view into the complexity involved with building and supporting the app.
Introduction to the Page Visibility API
This could save a lot of bandwidth and user CPU over time: “If a page is minimized or hidden behind another tab, it may not make sense to continue functionality such as polling the server for updates or performing an animation. The Page Visibility API aims to give developers information about whether or not the page is visible to the user.”