Adds Photoshop-like rulers and guides to a web page with a JavaScript library; also available as a bookmarklet for quick browser use.

TypeScript uses structural typing and strict checks for fresh object literals, union types, type assertions, satisfies, and narrowing to prevent runtime errors.

Intermittent Cucumber failures can come from a leftover browser alert blocking Selenium commands after an unfinished AJAX request.

Capybara driver for browser testing with QtWebKit when JavaScript support is needed.

Browsers may keep PATCH and DELETE on 302 redirects instead of switching to GET, breaking AJAX flows. Use 303 See Other or POST method override to force a GET follow-up.

Duplicate package versions in Yarn can break shared globals like window.jQuery, leaving plugins such as datepicker unavailable. resolutions can force one version across dependencies.

A lightweight jQuery alert and dialog replacement with full control over styling, content, position, and behavior, without a full UI framework.

We didn’t want to leave front-end developers in the dark when their Javascript throws errors, so we’ve added a Hoptoad notifier for Javascript!

Jasmine specs can run too early when the DOM is not ready, causing setup to fail. $(done) inside beforeAll waits for document readiness before the suite starts.

Rails default ETags often never repeat because rotating CSRF tokens and CSP nonces change response bytes, blocking cache hits and 304 responses.

Imported ESM functions are hard to spy on in Jasmine; several workarounds keep call counts testable, including wrapper objects, dependency injection, and test runners with module mocking.

Lightweight jQuery clipboard-copy plugin built on Zero Clipboard, using an invisible Flash movie compatible with Flash Player 10 and below.

Compresses JavaScript.

Lightweight browser text editor for comments, forum posts, and basic CMS text with live preview and minimal setup.

A strict Content Security Policy for Rails limits scripts to nonce-approved sources while keeping styles, images, forms, and fonts workable.

Sass unit arithmetic makes it easy to attach, strip, and convert measurement units when working with CSS values and timing data.

Ruby gems need manual file loading, multi-version support, and their own release workflow, unlike Rails apps. Safe changes depend on understanding structure, tests, versioning, and packaging.

File downloads are awkward to verify with Selenium because browsers may prompt, auto-save, or render binaries instead of HTML. Alternative approaches use request specs, Rack::Test, or the browser download folder.

Google Analytics can record a custom path instead of the current URL, useful for hidden tokens, grouped pages, or interactions without a request.

Rails apps upgrading to Cucumber 3 often need gem updates, new tag syntax, and step-definition fixes to avoid parser and argument-mismatch errors.

Capistrano can switch an app into maintenance mode by publishing a static page on each web server, with customizable message, timing, and template.

CLI test case prioritization for Ruby on Rails using coverage data can surface failing specs earlier and reduce regression testing time.

In-place file uploads with ActiveStorage DirectUpload can show progress and support removing a chosen file before form submission.

Rails 2.3.x upgrades fix security vulnerabilities and API changes across patch levels, with extra CSRF, XSS, and JSON gem updates needed on some releases.