Liquid Canvas is a JavaScript library which allows you to draw inside an HTML canvas element with an easy yet powerful description language.

It can be used to add graphics to your web page without ever touching an image creation tool such as The Gimp, Inkscape or Photoshop.

Check out the Demo and the basic example and then download version 0.3.

Rails can fail to boot after a Bundler upgrade when the new YAML engine cannot handle symbol values in localization files.

Upgrading Ubuntu from Ruby 1.8.7 to 1.9.2 can break Rails 2 apps using RSpec and removes installed gems, but Bundler can restore dependencies.

PhantomJS is a minimalistic headless WebKit.

It has fast and native support for various web standards:

DOM handling, CSS selector, JSON, Canvas, and SVG.

PhantomJS can be fully scripted using JavaScript. It is an optimal solution for headless testing of web-based applications, site scraping, pages capture, SVG renderer, PDF converter and many other usages.

Changing a persisted association can leave cached counts inconsistent; freezing an ActiveRecord foreign key prevents updates that would otherwise require extra bookkeeping.

ActiveRecord#touch updates updated_at but also triggers callbacks and validations, making frequent timestamp updates expensive. touch_gently and touch_all_gently refresh timestamps without callbacks.

Blueprint inspects installed packages, changed config files, and locally built software to generate Puppet, Chef, or shell code from an Ubuntu system state.

List of global variables available to a Ruby script.

Rails 2-compatible versions of Cucumber, Capybara, and related gems avoid breakage from newer dependencies and Capybara API changes.

Remove the message-header buttons in Thunderbird 3 while keeping the existing header layout and right-side menu intact with a small userChrome.css tweak.

Detects when a dynamically inserted image has finished loading so its dimensions are available. A jQuery load handler can fire reliably across browsers for this use case.

@javascript Cucumber scenarios run with Selenium and can slow down test runs; cucumber --tags ~@javascript skips them when needed.

Insert existing PDF pages into a new LaTeX document without layout errors by using pdfpages and \includepdf.

Git merges of .po files can create invalid gettext catalogs, especially with concurrent edits in branches. Treating them as binary avoids unsafe merge results.

Bash prompt customization relies on PS1 escape sequences, colors, and command output to show user, host, directory, git branch, and status information.

Now allows to list transition paths from and to arbitrary states.

With SNI, you can have many virtual hosts with HTTPS sharing the same IP address and port, and each one can have its own unique certificate. SNI is supported by all major browsers except Internet Explorer on XP, Safari on XP, wget, Android and Java.

Type looking a little flabby? Overweight? Want to give it a kick in the pants? Take a look at some of these tricks to really give your web type a workout.

User-supplied filenames can escape a target directory and expose arbitrary readable files. A guarded send_file helper keeps downloads inside the intended path.

PIE may fail to redraw nested elements when a parent class changes, leaving updated styles stale; changing the target element’s own CSS or markup works around it.

JavaScript Garden is a growing collection of documentation about the most quirky parts of the JavaScript programming language. It gives advice to avoid common mistakes, subtle bugs, as well as performance issues and bad practices that non-expert JavaScript programmers may encounter on their endeavours into the depths of the language.

JavaScript Garden does not aim to teach you JavaScript. Former knowledge of the language is strongly recommended in order to understand the topics covered in this guide

Custom RSpec matcher verifies whether an ActiveRecord record still exists in the database after destruction or cleanup.

Install and harden an SSH daemon on Ubuntu by adjusting sshd_config to block root logins, restrict users, and disable password authentication.

Core vim actions for editing text efficiently: window, buffer, navigation, search, clipboard and undo shortcuts plus syntax highlighting.