Interactive timeline effects without JavaScript, using CSS state and radio buttons to switch visible content.

Large MySQL dumps can take days to import when only a development subset is needed. Filtering INSERT rows during import loads structure and selected data without editing the dump file.

Ruby 1.8 on OS X Mavericks can fail to build therubyracer and libv8 native extensions; updating the gems or linking a Homebrew V8 build can restore bundling.

pngquant compresses PNG images by converting 24/32-bit files to paletted 8-bit output, often cutting size dramatically while preserving full alpha transparency.

MySQL 5.6 changed DECIMAL storage and removed the old extra-digit behavior, so columns that relied on it may now need higher precision.

rbenv on Ubuntu 12.04 fails to build older REE releases because of tcmalloc.cc and SSL compilation issues.

Refactoring keeps code maintainable by improving structure without changing behavior, reducing technical debt and making future changes easier.

Using self as a JavaScript variable can collide with the global window alias and cause confusing bugs when capturing this in callbacks.

Support for Ruby 1.9.3 ends on February 23, 2015, leaving applications on that version without further maintenance or security fixes.

Modularity 2 replaces does with include-based traits and new naming rules, with automatic migration support for existing Ruby projects.

Bluetooth starts automatically at boot and can be stopped by disabling the service in startup scripts.

Verify that page titles contain expected text during browser tests with Selenium and Cucumber, avoiding mismatches in document title assertions.

||= does not memoize nil values, so expensive lookups or database queries may run repeatedly when the result is absent. Use defined-instance-variable caching when nil must be cached.

Icon sizing and file formats vary across Windows, macOS, iOS, Android, and Linux, making asset preparation inconsistent.

Long unbroken strings can stretch table columns and break layout. table-layout: fixed with set widths keeps column sizes consistent across rows.

Opal compiles Ruby to JavaScript and includes a runtime and core library, aiming for broad RubySpec compatibility for browser and client-side code.

Rails automatically applies a same-named layout for a controller, which can create surprising view behavior when an unintended template is picked up.

Capybara/Selenium tests involve a test process, a server thread and a browser process, so blocking, stale time, and uncommitted transactions can cause seemingly impossible failures.

has_many :through associations can lose or duplicate records when written to, especially with nested forms and loaded associations. Treat them as read-only or build the join records directly.

Colorbox overlay opacity set in the initializer can be overridden by an inline style, leaving the backdrop too opaque. A CSS !important rule on #cboxOverlay restores the intended transparency.

Ruby arrays can be ordered by multiple keys with sort_by, using an array of values for primary and secondary criteria. Natural sorting also works with the same pattern.

Bundled commands can fail on Ruby 1.8.7 and Rails 2.3 with undefined method 'name' for Array because rubygems-bundler or Bundler no longer works reliably on older setups.

Multiple monitors can make Skype sharing tricky, but moving the call window to the desired display before starting sharing selects the correct screen on Linux.

Virtual ActiveRecord attributes can lose Rails-style type casting, causing string values, validation roundtrip bugs, and broken select boxes. Virtus restores coercion for non-persistent fields.