Reference Comparisons - Compares rendered web pages against reference pages to verify identical visual output.
Rendering Tests - Verifies browser displays pages as expected by comparing rendered output against a reference.
Shared Test Authoring - Writes tests that describe standard behavior in a machine-readable format so all browser projects can reuse them.
Multi-Protocol Test Servers - Serves tests over HTTP, HTTPS, and WebSocket protocols using a single configurable server.
Browser Automation Testing - Runs automated test suites against browsers using WebDriver and Python to verify standards compliance.
Self-Contained HTML Test Pages - Loads self-contained HTML pages in any browser and checks whether they pass or fail based on programmatic or manual results.
Automated Browser Launchers - Launches a specified browser automatically, loads test files, and collects results without manual interaction.
Browser Execution - Starts local HTTP and WebSocket servers so tests can be loaded and executed interactively in a browser.
Specification Conformance Validation - Automated system that checks browser implementations against W3C and WHATWG specifications using shared test cases.
Browser Conformance Validators - Runs automated conformance tests against a browser to check whether its behavior matches web standards.
Test Discovery Mechanisms - Discovers tests by scanning the filesystem and generating a manifest for efficient lookup and execution.
Test Manifest Generators - Produces or updates a manifest file that indexes all available tests for efficient discovery and execution.
Contribution Workflows - Submits test cases via pull requests with automatic labeling and reviewer notification, then reviews and merges contributions.
Automated Reviewer Notification Systems - Automatically labels pull requests by changed directory and notifies relevant maintainers listed in META.yml files for streamlined peer review.
Test Manifest Generators - Provides a manifest generator that enumerates all tests and their types for efficient discovery.
Specification Discrepancy Reporting - Identifies discrepancies between browser behavior and web standards while authoring tests and reports findings to spec editors.
Path-Based Reviewer Notifications - Automatically notifies maintainers by matching changed file paths against directory-specific META.yml files.
Accessibility API Mapping Tests - Executes Python tests that check how browser accessibility APIs map to web content standards.
Test Authoring - Tests browser automation behavior using Python and pytest to exercise the WebDriver protocol.
Crashtests - Loads documents and passes if the browser completes without crashing.
Test Report Exporters - Outputs test outcomes as human-readable logs or machine-readable JSON reports for debugging or upload.
Branch-Triggered Full Runs - Triggers a full browser test run by pushing to a specially named branch and submits results to a dashboard.
Custom Runner Implementations - Implements a tailored execution method for the test suite to support advanced or specialized workflows.
Custom Test Runners - Provides a framework for implementing custom test runners that follow documented test-type behaviors.
Cross-Browser Result Dashboards - Archives and displays test results collected from various browsers over time to monitor compatibility status.
Human-Verified Pages - Creates pages requiring human interaction for verification when automation is not feasible.
Specification Bug Discovery - Discovers discrepancies between browser implementations and standards during test authoring, feeding fixes back to spec editors.
Test File Linters - Scans test files for common errors and style violations to maintain a consistent and correct test corpus.
Testing Infrastructure and Management - Generates test manifests, lints test files, and manages TLS certificates to maintain a healthy test repository.
Test Infrastructure - A hosted environment that enables running the full test suite from any browser without local setup or installation.
Specification-Based Directory Structures - Structures test files under directories named after the web standard they cover, with subdirectories matching spec headings for larger specs.
Visual Tests - Captures screenshots of rendered pages for comparison against expected renderings.
Polyfill Injection Scripts - Injects a polyfill script into every test page so the polyfill's behavior can be verified across the suite.
Polyfill Injection for Testing - Injects custom scripts into every test page to verify polyfill behavior across the full suite.
Core Standards - Official cross-browser test suite for web platform features.
