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JavaScript Tutorials

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    Node.js CSS Compressor: clean-css

    One of my recent finds on the goldmine that is GitHub is GoalSmasher's account. The GoalSmashers team has created three notable (or at least useful to me) utilities you all should know about: enhance-css: embeds imagery into stylesheets via Base64 encoding

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    X-Tag Web Components

    One of the awesome parts at working at Mozilla is being able to see and use projects from fellow engineers before they are shared with the world. One such effort comes from Daniel Buchner: X-Tag. X-Tag is a cross-browser web component...

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    Function Debouncing with Underscore.js

    The ability to listen and react to user interactions with JavaScript is fundamental and incredibly useful. Some interactions happen frequently and some rarely. Some listener functions are light of action, others can be quite taxing on the browser. Take window's resize event for...

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    JavaScript CustomEvent

    JavaScript events have been the gateway to user interaction within the browser since its inception. Not only do events tell us when an interaction happens, but events tell us type of interaction, the nodes involved, and provide us methods for working with the event.

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    QUOTA_EXCEEDED_ERR in Mobile Safari

    I've been working on an HTML5 application for the new Mozilla Marketplace, writing a tutorial along the way to help all of you create and promote your HTML5 web-powered app.  The HTML5 app uses localStorage to save basic search history, as well as other newer...

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    Selector Engines: Right to Left

    One lessor known fact about CSS selectors, querySelectorAll, and JavaScript-based selector engines is that they read your selectors from right to left.  This news hit me as illogical at first, as you'd think that the first element in a selector string like "#myElement a.something .else" would...

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    JavaScript Canvas Image Conversion

    At last week's Mozilla WebDev Offsite, we all spent half of the last day hacking on our future Mozilla Marketplace app. One mobile app that recently got a lot of attention was Instagram, which sold to Facebook for the bat shit crazy price of one...

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    Detect DOM Node Insertions with JavaScript and CSS Animations

    I work with an awesome cast of developers at Mozilla, and one of them in Daniel Buchner. Daniel's shared with me an awesome strategy for detecting when nodes have been injected into a parent node without using the deprecated DOM Events API.

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    JavaScript CSS Helpers

    I spend a good amount of time looking at JavaScript framework source code. Regardless of which frameworks you have allegiance to, you can learn an awful lot by looking under the hood of widely used code collections. One of many handy snippets can be...

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    Load CSS Files via AMD with XStyle

    AMD loaders are letting us load just about anything: AMD modules, basic JavaScript files (from any origin), text-based files (HTML templates, for example), and more. Unfortunately most loaders don't have CSS loading capabilities, most likely because "onLoad"-style events aren't provided by all browsers for stylesheets.