E-commerce • Consumer apps • Travel
Cross-Browser and Device Confidence
Ensure core journeys work across browsers and devices your users actually rely on.
Challenge
Browser-specific behavior breaks UX and trust, especially for critical user paths. A checkout flow that works in Chrome may fail in Safari due to a date picker difference. A dashboard that renders correctly on desktop may overflow on tablet viewports. These issues are discovered by users in production because most teams cannot test enough browser and device combinations before each release — especially under time pressure.
Stably approach
Stably runs key flows across target browser and device matrices using Playwright's multi-browser support — Chromium, Firefox, and WebKit. Prioritize testing based on your actual traffic and business impact rather than trying to cover every combination. AI assertions verify that content renders correctly regardless of browser-specific layout differences, and visual assertions catch rendering regressions that functional tests miss. One test suite covers all target environments without browser-specific workarounds.
What changes
One test suite runs on Chromium, Firefox, and WebKit simultaneously
Playwright's --project flag lets you run the same test across all three browser engines in parallel. Stably's cloud workers handle all three simultaneously — no need to maintain separate test files for different browsers.
AI assertions catch visual breakage that selectors miss
A button selector passes in every browser, but in Safari the button overlaps the nav bar. Stably's visual assertions using toMatchScreenshotPrompt describe what the page should look like — "the CTA button is fully visible below the hero text" — and catch rendering issues no functional test would detect.
Safari date picker and Firefox dropdown quirks are covered
Browser-specific form controls are a common source of bugs. Stably's AI agents interact with native date pickers, dropdowns, and file inputs across browsers — handling the behavioral differences so you do not need browser-specific test branches.
Test the devices your customers actually use
Configure viewport sizes to match your analytics data. If 40% of your traffic comes from mobile Safari, test that first. Stably runs each viewport as a separate test configuration — your 1024x768 tablet test runs alongside your 375x812 iPhone test.
When this is the right fit
- Bugs reproduce only on specific browsers or devices
- Teams cannot test enough environments before release
- Responsive issues are found after deploy
- Customer support tickets cluster around specific browsers or screen sizes