Internet Explorer 7 and 8 fetch stylesheets twice when http or https is omitted, so protocol-relative URLs are unsafe for CSS links on public sites.

Mixed-content requests can undermine SSL pages and may go unnoticed unless Firefox warnings are enabled. about:config and the Web Console help locate insecure http:// resources.

Rails 2.3.5 can send an invalid Response content-type for localized view templates, causing browsers to receive de.html instead of text/html.

Pure CSS progress indicators can replace animated GIFs, JavaScript, or Flash for lightweight loading animations in web interfaces.

Large free vector icon set with custom SVG support and export as icon font or PNGs; a paid upgrade raises the limit to 925 icons.

Extracting the web address host from a string can fail on invalid input. URI.parse returns the hostname, and URI.join can rebuild the base URL without path, query, or fragment.

Large branch lists make it hard to spot the active Git branch; git rev-parse --abbrev-ref HEAD returns only the current branch name.

Haml 3.1.2 can double-escape single quotes in FormBuilder#text_field values, producing David's Chapter; upgrading to 3.1.5 or newer fixes it.

JOIN-heavy scopes become brittle when callers chain more conditions or associations. Converting them to a simple IN query preserves chaining and avoids unexpected SQL side effects.

ActiveModel::Errors looks like a Hash but iterates arrays as separate pairs, which can break custom handling of multiple validation messages.

A too-large class is harder to understand, test, and change. Several refactoring approaches break it into smaller responsibilities.

Manually requiring Rails models can load classes twice and trigger duplicate validations or other subtle test failures. Let Rails autoload models or require them by the same path Rails uses.

Immediate feedback for failing RSpec examples while passing ones continue to appear as green dots. Uses rspec/instafail with RSpec::Instafail formatting.

Linear gradients can be awkward for glossy or dimensional effects and have uneven browser support; inset box shadows can mimic fixed highlights or shadows more reliably.

Inset box-shadow can fake borders without doubled edges on nested elements and can create multiple frame-like borders on one element.

Formats and splits phone numbers worldwide, including many country-specific variations and edge cases, for normalization and consistent handling.

Fat ActiveRecord classes accumulate business logic over time, creating maintenance problems and callback hell in large apps. SRP keeps persistence objects focused and easier to change.

Rails specs can get controller, model, or request helpers from directory-based inference; :type forces the desired context even when a file lives elsewhere.

Determines a user's timezone in JavaScript when browser and system settings may be unreliable.

Captures browser screenshots on demand or automatically when tests fail, making visual debugging of Capybara runs easier.

StateMachine can raise undefined method '-' for #<StateMachine::BlacklistMatcher> when subtracting excluded states from all; use a union to build the allowed source states.