Cross Browser Testing Interview Questions

Cypress supports: 1) Chrome and Chromium-based browsers (Chrome, Chromium, Edge), 2) Firefox, 3) Electron, 4) Brave. Each browser may have specific configuration requirements and limitations. Chrome is the default browser and provides the most complete feature set.

Browser configuration involves: 1) Setting browser in cypress.config.js, 2) Using --browser flag in CLI, 3) Configuring browser-specific options, 4) Setting viewport dimensions, 5) Handling browser-specific capabilities. Example: cypress run --browser chrome

Common challenges include: 1) Different rendering behaviors, 2) Feature support variations, 3) Performance differences, 4) Browser-specific bugs, 5) Different security models, 6) Varying JavaScript implementations, 7) CSS compatibility issues.

Browser-specific selectors require: 1) Using data-* attributes for consistency, 2) Implementing fallback selectors, 3) Handling vendor prefixes, 4) Using browser detection when needed, 5) Maintaining selector documentation for different browsers.

Viewport configuration includes: 1) Setting width and height, 2) Handling responsive breakpoints, 3) Device-specific viewports, 4) Orientation settings, 5) Browser-specific viewport behaviors. Use cy.viewport() command or configuration.

Browser event handling includes: 1) Using browser-agnostic event triggers, 2) Implementing event polyfills when needed, 3) Handling browser-specific event behaviors, 4) Testing event propagation, 5) Verifying event handling consistency.

Screenshot best practices include: 1) Consistent viewport settings, 2) Handling dynamic content, 3) Browser-specific capture settings, 4) Proper comparison strategies, 5) Managing screenshot artifacts across browsers.

Capability detection involves: 1) Feature checking, 2) Browser version detection, 3) API support verification, 4) Implementing fallbacks, 5) Managing browser-specific code paths. Use Cypress.browser object for information.

Common issues include: 1) CSS rendering differences, 2) JavaScript API support, 3) Event handling variations, 4) Performance differences, 5) Security model variations, 6) DOM implementation differences.

Timeout handling includes: 1) Setting browser-specific timeout values, 2) Handling different performance characteristics, 3) Implementing retry strategies, 4) Managing command timeouts, 5) Browser-specific wait conditions.

Configuration management includes: 1) Browser-specific settings in config files, 2) Environment-specific configurations, 3) Feature flags for different browsers, 4) Browser-specific plugins, 5) Custom commands per browser.

Bug handling strategies include: 1) Browser detection and workarounds, 2) Feature detection, 3) Conditional test execution, 4) Browser-specific assertions, 5) Documentation of known issues.

CSS handling includes: 1) Vendor prefix management, 2) CSS reset/normalize usage, 3) Browser-specific stylesheet loading, 4) Visual regression testing, 5) Style computation verification.

Responsive testing includes: 1) Multiple viewport configurations, 2) Browser-specific breakpoint testing, 3) Device emulation, 4) Media query testing, 5) Layout verification across browsers.

JavaScript handling includes: 1) Feature detection, 2) Polyfill implementation, 3) Browser-specific code paths, 4) API compatibility testing, 5) Error handling across browsers.

Extension testing includes: 1) Browser-specific extension loading, 2) Extension API testing, 3) Integration testing with extensions, 4) Extension state management, 5) Cross-browser compatibility.

Network handling includes: 1) Browser-specific request handling, 2) CORS configuration, 3) SSL/TLS testing, 4) Network throttling, 5) Request interception across browsers.

Performance testing includes: 1) Browser-specific metrics collection, 2) Performance baseline comparison, 3) Resource loading optimization, 4) Rendering performance testing, 5) Memory usage monitoring.

Security feature handling includes: 1) Same-origin policy differences, 2) Security header testing, 3) Cookie handling variations, 4) Certificate verification, 5) Security model testing.

Version targeting includes: 1) Browser version detection, 2) Feature support matrices, 3) Version-specific test suites, 4) Compatibility documentation, 5) Version-specific configurations.

Advanced strategies include: 1) Comprehensive browser coverage, 2) Automated browser matrix testing, 3) Complex compatibility testing, 4) Advanced visual regression, 5) Sophisticated browser orchestration.

Feature testing includes: 1) Advanced feature detection, 2) Complex compatibility matrices, 3) Feature-specific test suites, 4) Browser capability testing, 5) Advanced feature verification.

Visual testing includes: 1) Advanced screenshot comparison, 2) Visual regression algorithms, 3) Layout testing strategies, 4) Complex visual verification, 5) Browser-specific visual testing.

Animation testing includes: 1) Advanced animation verification, 2) Timing-based testing, 3) Frame rate analysis, 4) Animation performance testing, 5) Browser-specific animation handling.

Accessibility testing includes: 1) Screen reader compatibility, 2) ARIA implementation testing, 3) Keyboard navigation verification, 4) Color contrast analysis, 5) Browser-specific accessibility features.

Complex interaction testing includes: 1) Advanced event handling, 2) Touch/mouse interaction testing, 3) Drag-and-drop verification, 4) Gesture support testing, 5) Browser-specific interaction patterns.

Performance optimization includes: 1) Browser-specific optimizations, 2) Resource loading strategies, 3) Rendering optimization, 4) Memory management, 5) Network performance testing.

Extension testing includes: 1) Complex extension integration, 2) Extension API testing, 3) Cross-browser compatibility, 4) Extension performance testing, 5) Security verification.

Advanced automation includes: 1) Complex browser orchestration, 2) Multi-browser scenarios, 3) Browser synchronization, 4) Advanced browser control, 5) Browser state management.