Rails 2.3 can return either HTML or JSON from one controller action, but render_to_string inside format.json may trigger ActionView::MissingTemplate.

Makes cross-domain XHR work by tunneling communication through an IFRAME on the page, enabling requests that browser same-origin rules would block.

Ruby percent notation offers an alternative way to write strings without escaping quotes, useful for embedded apostrophes or quotation marks.

Ruby can override the backtick operator with a method named `, making command execution syntax callable as ordinary object behavior.

spreewald now provides a binary that lists available steps and can filter them by a search term.

debugger is unreliable on Ruby 2; byebug provides a fast, reliable debugger for Ruby 2.0.0+ using TracePoint and Debug Inspector.

Custom RSpec matcher for verifying delegated methods in Ruby models, including prefixed delegation like author_name.

AngularJS-native UI elements implement Google Material Design as a complement to Polymer's paper elements, giving Angular apps a consistent material-style interface.

Reusable UI components implement Google’s Material Design for web apps, offering prebuilt Paper elements for consistent interfaces.

Sass lacks a built-in way to assign a color a fixed hue; adjust-hue only shifts hues relatively. A small helper can target an absolute hue value.

Skype 4.3 on Linux fixes group chat problems with non-Linux clients and may require removing Ubuntu packages before reinstalling.

Manage many server sessions in terminator with split panes, window focus changes, and quick title editing using keyboard shortcuts.

Automatically wraps Bower packages as gems for the Rails asset pipeline, but duplicate JavaScript copies can conflict when mixed with other package sources.

Flexible jQuery content slider with minimal markup assumptions, customizable controls, and responsive slide sizing for mixed media like images, video, and text.

Ruby and curl requests can fail when a server only accepts older SSL/TLS versions; forcing a specific protocol version can restore connectivity.

Google’s Material Design provides a unified system for building consistent, intuitive interfaces across platforms and devices.

allow_value and other shoulda-matchers methods can disappear under Rails 4.1 with Spring, causing NoMethodError despite the gem being listed.

Spring ignores watch paths that do not exist when #watch runs, so file or directory changes may not trigger a reboot until Spring is restarted.

Chrome DevTools is gaining device sizing and network throttling, reducing the need for awkward Linux workarounds when simulating slower connections.

Bundler environment variables can shadow a Rails test app when integration-testing CLI tools with Aruba and Cucumber. Clearing the Bundler env and disabling Spring keeps commands isolated.

Selenium can miss browser events such as change during form input; a Cucumber step can fire jQuery-registered events manually with execute_script.

Pending AJAX requests can die when a Capybara test ends or switches scenarios, causing flaky JavaScript specs. Waiting for the page to load helps avoid the failure.

Atomic value updates in multi-threaded Ruby code prevent race conditions when several threads read and write shared state.