Cross-Browser Test Matrix Builder

A cross-browser testing checklist pairs your critical user journeys with the browser and device environments your team supports. Name each real environment as one line, add the tasks to check, and apply the plan. Every new case starts as Not tested. Assign owners, record your observations, and export Markdown or CSV without signup.

This builder organizes a plan; it does not launch browsers, provide devices or run remote tests. A Passed status is a person's entry, not an independently verified result.

The loadable example pairs two named environments with two contact-form journeys. All four cases remain Not tested until someone deliberately records a status. The browser versions are illustrative labels, not a recommended support range.

1. Agree the supported range. Use your product requirements and available usage evidence. List complete browser/version, operating system, device and viewport combinations. The builder does not invent browser shares or combine browser and OS names into unsupported pairs.
2. Name observable journeys. Include the starting state and intended outcome in your test instructions. This matrix accepts up to 10 environments and 10 journeys, for 100 planned cases. Each line must be unique and at most 200 characters; excess input is rejected for correction, not silently discarded.
3. Record what was actually done. Set Not tested, Passed, Failed, Blocked or Not applicable yourself. Explain limits and exclusions in evidence/notes. Missing release exports as Unknown; missing owner or notes as Not provided. No status grants release approval.
4. Keep observations attached to the right case. Reordering or adding lines preserves matching cases. Renaming an environment or journey creates a new case. Changing the release starts new untested cases; the builder asks before removing existing owners, notes or recorded statuses.
5. Review before sharing. Inspect private data yourself. Markdown escapes pasted HTML and formatting; CSV quotes cells and prefixes formula-like text with Text:. Check your spreadsheet's import and re-save behavior. Neither export verifies evidence or guarantees safe handling by every application.

MDN's introduction to cross-browser testing recommends agreeing a browser/device range and testing on real hardware where possible. Chrome's Device Mode documentation describes simulation as an approximation. CSV precautions follow OWASP's CSV injection guidance, including its caveats about spreadsheet behavior.

When a check fails, use the reproduction steps guide to write a repeatable report, compare the sample bug reports, and use the triage worksheet to agree an owner and next action. The severity versus priority guide separates observed impact from work ordering.

Published October 9, 2026. Updated October 10, 2026. Method: an original planning worksheet with explicit environment/journey pairs, manual statuses, stable case identities and bounded local exports. Inputs stay in the current tab and are not saved, uploaded or placed in shared URLs by this tool. Existing site analytics may record tool use without matrix contents.