testland/browser-matrix-strategy-reference
Use when deciding which browsers, OS versions and devices to test: a three-tier matrix built from traffic data, quarterly re-tier reviews, a published support policy and test budget, or the case for dropping an old browser. The Playwright, Selenium Grid and cloud-grid skills run it.
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compatibility-budget-tiers.mdreferences/
Compatibility budget - tier definitions and example budgets
Detailed tier tables for compatibility-budget.md. The tier model below defines the four commitment levels; the per-product-type tables are starting templates to copy and adjust against your own telemetry.
Tier model
| Tier | Definition | CI cadence |
|---|---|---|
| Tier 1 | Must work; failure blocks releases. | Per-PR smoke. |
| Tier 2 | Must work; failure blocks releases on detection. | Nightly full suite. |
| Tier 3 | Should work; broken-here is a known issue. | Pre-release manual / weekly. |
| Unsupported | Explicitly out of scope; bugs closed as "not supported." | None. |
The tier signals engineering investment, not user importance - a configuration with low traffic but contractual obligation may be Tier 1.
Example budget per product type
Modern web app
| Configuration | Tier |
|---|---|
| Chrome (current + 1 prior) | 1 |
| Edge (current) | 1 |
| Safari (current + 1 prior) | 1 |
| Firefox (current) | 2 |
| iOS Safari (current + 1 prior) | 1 |
| Chrome on Android (current) | 1 |
| Firefox Android | 3 |
| Samsung Internet | 3 |
| Internet Explorer | unsupported |
| < Chrome 100 | unsupported |
Internal SaaS (controlled audience)
| Configuration | Tier |
|---|---|
| Chrome (latest stable) | 1 |
| Chrome (current - 1 stable) | 1 |
| Edge (latest) | 2 |
| Firefox | 3 |
| Safari | 3 |
| All others | unsupported |
Open-source library
| Configuration | Tier |
|---|---|
| Node 18, 20, 22 on Linux | 1 |
| Node 18, 20, 22 on macOS | 2 |
| Node 18, 20, 22 on Windows | 2 |
| Bun (current) | 3 |
| Deno (current) | 3 |
| Older Node EOL versions | unsupported |
Mobile native app
| Configuration | Tier |
|---|---|
| iOS 17, 16 (current + 1 prior) | 1 |
| iOS 15 | 2 |
| iOS 14 | 3 |
| < iOS 14 | unsupported |
| Android 14, 13 | 1 |
| Android 12 | 2 |
| Android 11 | 3 |
| < Android 11 | unsupported |