petrkindlmann
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| Situation | Go to |
|---|---|
| Need to decide which browsers to test | Browser Matrix Design |
| Already on Playwright, just add browsers | Playwright Browser Configuration → references/playwright-and-cloud-config.md |
| Need real Safari/Windows/older OS, not engines | Cloud Platform Setup |
| One browser misbehaves; want a test for it | Common Cross-Browser Issues + browserName branch in references/testing-patterns.md |
| Need to record a divergence so it is not re-debugged | Known-Issues Log |
| Pixel diffs / baseline thresholds | use visual-testing |
Check .agents/qa-project-context.md first — if it exists, use it and skip anything already answered there. Then:
Analytics-driven matrix. Test what your users actually use. A browser at 0.3% traffic does not need the same investment as one at 40%. Check analytics quarterly — browser share shifts.
Progressive enhancement over pixel-perfect. Identical rendering across all browsers is neither achievable nor necessary. Define what "works" means: core functionality operates, content is accessible, layout is usable. Visual differences in shadows, gradients, or animation timing are acceptable.
Safari and Firefox surface the most cross-browser bugs. Chrome-only testing catches Chrome bugs. Safari's WebKit engine and Firefox's Gecko engine have the most behavioral differences from Chromium. Prioritize them.
Test functionality, not rendering-engine internals. A cross-browser test should verify that the user can complete a task, not that a CSS property renders identically. Visual comparison tools handle pixel-level differences.
Engines are not brands. Playwright's WebKit is not Safari and its Chromium is not Chrome — they share an engine, not the shipped product (codecs, fonts, enterprise policy, update cadence all differ). Report "WebKit coverage," not "Safari coverage," unless you ran real Safari on a cloud grid.
One test, multiple browsers. Write tests once. Run them across browser configurations. Never duplicate test logic for different browsers.
Step 1: Export browser/OS data from analytics (last 90 days)
Step 2: Rank by session share
Step 3: Group into tiers
Step 4: Assign test coverage per tier
Step 5: Review quarterly
| Tier | Criteria | Coverage | When to run |
|---|---|---|---|
| P0 | >10% traffic share | Full test suite | Every PR, every deploy |
| P1 | 3-10% traffic share | Smoke + critical paths | Nightly, pre-release |
| P2 | 1-3% traffic share | Smoke tests only | Weekly, pre-release |
| Skip | <1% traffic share | Not tested | Manual spot-check if reported |
## Browser Matrix — Q1 2026 (next-review: 2026-04-01)
| Browser | Version | Platform | Traffic % | Tier | Notes |
|---------|---------|----------|-----------|------|-------|
| Chrome | Latest | Windows | 34% | P0 | |
| Chrome | Latest | macOS | 12% | P0 | |
| Safari | Latest | macOS | 11% | P0 | WebKit-specific issues |
| Chrome | Latest | Android | 15% | P0 | Mobile viewport |
| Safari | Latest | iOS | 14% | P0 | Mobile Safari quirks |
| Firefox | Latest | Windows | 5% | P1 | Gecko rendering |
| Edge | Latest | Windows | 4% | P1 | Chromium-based but different UA/policy |
| Samsung Internet | Latest | Android | 3% | P1 | Chromium fork, lagging engine |
| Firefox | Latest | macOS | 1.5% | P2 | |
| Chrome | N-1 | Windows | 1.2% | P2 | Previous major version |
Playwright ships three browser engines — Chromium, Firefox, WebKit — so no cloud platform is needed for basic engine-level coverage. This is engine coverage, not brand coverage: bundled WebKit ≠ Safari and bundled Chromium ≠ Chrome (see Core Principle 5). Define one project per matrix entry, map mobile devices via devices[...], and drive locally installed branded browsers with the channel option.
See references/playwright-and-cloud-config.md for the full playwright.config.ts project list, branded-channel snippets, and --project run commands.
When to use channels: When you need real branded behavior that differs from the bundled engine — installed Chrome (channel: 'chrome') or Edge (channel: 'msedge') for extension support, enterprise policy, or codecs. WebKit and Firefox have no channel option; they are always Playwright's bundled engines. Note the edge project in the config and the msedge channel snippet are illustrative alternatives, not two projects to merge — a config needs one edge project, not both.
page.screencast() (Playwright 1.59+, current in 1.60) captures annotated video of a cross-browser run — useful when a matrix failure needs human review across engines. For agent-driven re-runs and stepping through a failure, use --ui (UI mode) or --debug (Inspector); PWDEBUG=1 and --headed are the other real entry points. There is no --debug=cli flag.
Cloud platforms (BrowserStack, Sauce Labs) provide real branded-browser/OS instances Playwright connects to over a CDP/Playwright WebSocket endpoint. Pass credentials and capabilities via environment variables, and keep the platform's playwrightVersion aligned with the Playwright version in package.json (currently 1.60.x — a client/server mismatch causes socket errors).
BrowserStack now recommends the npx browserstack-node-sdk runner plus a client.playwrightVersion capability (in addition to browserstack.playwrightVersion) to keep the client and grid sockets in lock-step. The raw wsEndpoint/CDP config below still works for direct connections; use the SDK path for new setups.
See references/playwright-and-cloud-config.md for the BrowserStack config (with the client.playwrightVersion cap), the Sauce Labs config, and the GitHub Actions parallel matrix that fans out across cloud browsers.
Real divergences that surface in cross-browser testing, with detection patterns and fixes. The CSS workarounds and Playwright tests for each are in references/common-browser-issues.md, covering: partitioned cookies / CHIPS in iframes, <input type="date">, the Clipboard API, scroll-behavior, backdrop-filter, the <dialog> element, View Transitions, and Web Animations timing.
The classic Safari-laggard list is mostly resolved (flexbox gap, :has() shipping, same-document View Transitions are all Baseline). Today's real divergences:
Partitioned attribute), Safari's ITP, and Firefox's State Partitioning each behave differently for embedded third-party contexts. Test third-party cookies in an iframe per engine, not just "the browser supports cookies." See the runnable per-engine iframe test in references/common-browser-issues.md.:has() selector performance: Universally supported since 2023, but a :has()-heavy page can have very different style-recalc cost across engines. Watch list — profile if a page feels janky in one engine; visual-regression it in visual-testing.When a divergence is real and you cannot fix the app immediately, record it in a committed file (docs/browser-issues.md) so it is not re-debugged from scratch. The table is the artifact Done When checks for, and every row's test must assert the user outcome, not the CSS property:
| Affected browser | Repro | Workaround / fallback / ticket | Test asserts (user outcome, not CSS) |
|------------------|-------|--------------------------------|--------------------------------------|
| Safari (WebKit) ≤17 | scroll-behavior: smooth is partial | rely on anchor nav; no JS scroll dependency | anchor link puts heading in viewport (`toBeInViewport`) |
| Firefox ≤102 | backdrop-filter unsupported | -webkit- prefix + rgba background fallback | overlay readable; modal content visible |
| Firefox (current) | cross-document View Transitions flagged off | progressive enhancement; instant nav fallback | navigation completes; target page heading visible |
Keep one row per divergence. A row with no ticket and no fallback is an open bug, not a documented issue.
The core patterns and the rules that govern them:
browserName only when behavior genuinely differs (the WebKit date-input fallback and Chromium-only clipboard permission aname: cross-browser-testing description: >- Design analytics-driven browser test matrices and execute cross-browser tests. Covers BrowserStack/Sauce Labs configuration, Playwright browser channels, common cross-browser CSS/JS divergences, a known-issues documentation log, and progressive enhancement validation. Use when: "cross-browser," "browser matrix," "BrowserStack," "Safari issues," "browser compatibility," "Edge," "works in Chrome but not Safari." Not for: pixel-level baseline strategy and threshold tuning — use visual-testing; device-farm testing of native/hybrid apps — use mobile-testing. Related: visual-testing, playwright-automation, ci-cd-integration, mobile-testing. license: MIT metadata: author: kindlmann version: "2.0" category: specialized
--- name: cross-browser-testing description: >- Design analytics-driven browser test matrices and execute cross-browser tests. Covers BrowserStack/Sauce Labs configuration, Playwright browser channels, common cross-browser CSS/JS divergences, a known-issues documentation log, and progressive enhancement validation. Use when: "cross-browser," "browser matrix," "BrowserStack," "Safari issues," "browser compatibility," "Edge," "works in Chrome but not Safari." Not for: pixel-level baseline strategy and threshold tuning — use visual-testing; device-farm testing of native/hybrid apps — use mobile-testing. Related: visual-testing, playwright-automation, ci-cd-integration, mobile-testing. license: MIT metadata: author: kindlmann version: "2.0" category: specialized --- <objective> Chrome-only testing gives false confidence: a layout that works in Chromium can break in WebKit, a clipboard call that succeeds in Chrome silently no-ops in Firefox, and a partitioned-cookie flow can pass everywhere except the one engine your users are on. This skill produces an analytics-driven browser matrix, a Playwright (or cloud-platform) config that runs it, and a committed log of known browser divergences — each verified by a test that asserts the user outcome, not the CSS. </objective> ## Quick Route | Situation | Go to | |-----------|-------| | Need to decide *which* browsers to test | Browser Matrix Design | | Already on Playwright, just add browsers | Playwright Browser Configuration → `references/playwright-and-cloud-config.md` | | Need real Safari/Windows/older OS, not engines | Cloud Platform Setup | | One browser misbehaves; want a test for it | Common Cross-Browser Issues + `browserName` branch in `references/testing-patterns.md` | | Need to record a divergence so it is not re-debugged | Known-Issues Log | | Pixel diffs / baseline thresholds | use `visual-testing` | ## Discovery Questions Check `.agents/qa-project-context.md` first — if it exists, use it and skip anything already answered there. Then: 1. **Target browsers from analytics:** What do actual users use? Pull browser/OS data from your analytics tool. Testing browsers nobody uses is waste; missing a browser 15% of users rely on is a bug. 2. **Desktop and mobile?** Mobile Safari on iOS and Chrome on Android render differently than their desktop counterparts. Treat them as separate matrix entries. 3. **Cloud platform:** BrowserStack, Sauce Labs, LambdaTest, or local engines only? Cloud platforms provide real branded browsers and OSes; Playwright's bundled engines cover Chromium, Firefox, and WebKit (not Chrome/Safari themselves). 4. **Progressive enhancement or pixel-perfect?** Progressive enhancement accepts graceful degradation. Pixel-perfect demands identical rendering. The answer determines pass/fail criteria. 5. **Existing Playwright config?** If the project already uses Playwright, cross-browser testing is a configuration change, not a new tool. --- ## Core Principles 1. **Analytics-driven matrix.** Test what your users actually use. A browser at 0.3% traffic does not need the same investment as one at 40%. Check analytics quarterly — browser share shifts. 2. **Progressive enhancement over pixel-perfect.** Identical rendering across all browsers is neither achievable nor necessary. Define what "works" means: core functionality operates, content is accessible, layout is usable. Visual differences in shadows, gradients, or animation timing are acceptable. 3. **Safari and Firefox surface the most cross-browser bugs.** Chrome-only testing catches Chrome bugs. Safari's WebKit engine and Firefox's Gecko engine have the most behavioral differences from Chromium. Prioritize them. 4. **Test functionality, not rendering-engine internals.** A cross-browser test should verify that the user can complete a task, not that a CSS property renders identically. Visual comparison tools handle pixel-level differences. 5. **Engines are not brands.** Playwright's WebKit is *not* Safari and its Chromium is *not* Chrome — they share an engine, not the shipped product (codecs, fonts, enterprise policy, update cadence all differ). Report "WebKit coverage," not "Safari coverage," unless you ran real Safari on a cloud grid. 6. **One test, multiple browsers.** Write tests once. Run them across browser configurations. Never duplicate test logic for different browsers. --- ## Browser Matrix Design ### Analytics-Based Methodology ``` Step 1: Export browser/OS data from analytics (last 90 days) Step 2: Rank by session share Step 3: Group into tiers Step 4: Assign test coverage per tier Step 5: Review quarterly ``` ### Tier System | Tier | Criteria | Coverage | When to run | |------|----------|----------|-------------| | **P0** | >10% traffic share | Full test suite | Every PR, every deploy | | **P1** | 3-10% traffic share | Smoke + critical paths | Nightly, pre-release | | **P2** | 1-3% traffic share | Smoke tests only | Weekly, pre-release | | **Skip** | <1% traffic share | Not tested | Manual spot-check if reported | ### Example Matrix (derived from analytics) ```markdown ## Browser Matrix — Q1 2026 (next-review: 2026-04-01) | Browser | Version | Platform | Traffic % | Tier | Notes | |---------|---------|----------|-----------|------|-------| | Chrome | Latest | Windows | 34% | P0 | | | Chrome | Latest | macOS | 12% | P0 | | | Safari | Latest | macOS | 11% | P0 | WebKit-specific issues | | Chrome | Latest | Android | 15% | P0 | Mobile viewport | | Safari | Latest | iOS | 14% | P0 | Mobile Safari quirks | | Firefox | Latest | Windows | 5% | P1 | Gecko rendering | | Edge | Latest | Windows | 4% | P1 | Chromium-based but different UA/policy | | Samsung Internet | Latest | Android | 3% | P1 | Chromium fork, lagging engine | | Firefox | Latest | macOS | 1.5% | P2 | | | Chrome | N-1 | Windows | 1.2% | P2 | Previous major version | ``` ### Version Coverage Strategy - **Latest:** Always test current stable release. - **Latest - 1:** Test previous major version only for P0 browsers where analytics show >1% on older versions. - **Extended Support Release (ESR):** Test Firefox ESR only if enterprise users are a significant segment. - **Do not test:** Beta/Canary/Nightly releases unless you are a browser vendor or building browser-facing tools. --- ## Playwright Browser Configuration Playwright ships three browser *engines* — Chromium, Firefox, WebKit — so no cloud platform is needed for basic engine-level coverage. This is engine coverage, not brand coverage: bundled WebKit ≠ Safari and bundled Chromium ≠ Chrome (see Core Principle 5). Define one project per matrix entry, map mobile devices via `devices[...]`, and drive locally installed branded browsers with the `channel` option. See `references/playwright-and-cloud-config.md` for the full `playwright.config.ts` project list, branded-channel snippets, and `--project` run commands. **When to use channels:** When you need real branded behavior that differs from the bundled engine — installed Chrome (`channel: 'chrome'`) or Edge (`channel: 'msedge'`) for extension support, enterprise policy, or codecs. WebKit and Firefox have no channel option; they are always Playwright's bundled engines. Note the `edge` project in the config and the `msedge` channel snippet are illustrative alternatives, not two projects to merge — a config needs one `edge` project, not both. **`page.screencast()` (Playwright 1.59+, current in 1.60)** captures annotated video of a cross-browser run — useful when a matrix failure needs human review across engines. For agent-driven re-runs and stepping through a failure, use `--ui` (UI mode) or `--debug` (Inspector); `PWDEBUG=1` and `--headed` are the other real entry points. There is no `--debug=cli` flag. --- ## Cloud Platform Setup Cloud platforms (BrowserStack, Sauce Labs) provide real branded-browser/OS instances Playwright connects to over a CDP/Playwright WebSocket endpoint. Pass credentials and capabilities via environment variables, and keep the platform's `playwrightVersion` aligned with the Playwright version in `package.json` (currently 1.60.x — a client/server mismatch causes socket errors). **BrowserStack now recommends** the `npx browserstack-node-sdk` runner plus a `client.playwrightVersion` capability (in addition to `browserstack.playwrightVersion`) to keep the client and grid sockets in lock-step. The raw `wsEndpoint`/CDP config below still works for direct connections; use the SDK path for new setups. See `references/playwright-and-cloud-config.md` for the BrowserStack config (with the `client.playwrightVersion` cap), the Sauce Labs config, and the GitHub Actions parallel matrix that fans out across cloud browsers. --- ## Common Cross-Browser Issues Real divergences that surface in cross-browser testing, with detection patterns and fixes. The CSS workarounds and Playwright tests for each are in `references/common-browser-issues.md`, covering: partitioned cookies / CHIPS in iframes, `<input type="date">`, the Clipboard API, `scroll-behavior`, `backdrop-filter`, the `<dialog>` element, View Transitions, and Web Animations timing. ### Modern Cross-Browser Gotchas (2026) The classic Safari-laggard list is mostly resolved (flexbox `gap`, `:has()` shipping, same-document View Transitions are all Baseline). Today's real divergences: - **Partitioned cookies / partitioned storage:** Chrome's CHIPS (`Partitioned` attribute), Safari's ITP, and Firefox's State Partitioning each behave differently for embedded third-party contexts. Test third-party cookies *in an iframe per engine*, not just "the browser supports cookies." See the runnable per-engine iframe test in `references/common-browser-issues.md`. - **`:has()` selector performance:** Universally supported since 2023, but a `:has()`-heavy page can have very different style-recalc cost across engines. Watch list — profile if a page feels janky in one engine; visual-regression it in `visual-testing`. - **View Transitions API:** Same-document transitions are Baseline (Chrome 111, Safari 18, Firefox 144 — Oct 2025), so they are no longer a divergence. **Cross-document** transitions are still the gap: Chrome 126+, Safari 18.2+, Firefox behind a flag. Treat cross-document as progressive enhancement and verify the no-transition fallback. - **WebDriver BiDi:** Production-ready in Selenium 4, partially supported in Playwright. For new cross-runner projects, BiDi is the convergence point. Watch list. --- ## Known-Issues Log When a divergence is real and you cannot fix the app immediately, record it in a committed file (`docs/browser-issues.md`) so it is not re-debugged from scratch. The table is the artifact `Done When` checks for, and every row's test must assert the **user outcome, not the CSS property**: ```markdown | Affected browser | Repro | Workaround / fallback / ticket | Test asserts (user outcome, not CSS) | |------------------|-------|--------------------------------|--------------------------------------| | Safari (WebKit) ≤17 | scroll-behavior: smooth is partial | rely on anchor nav; no JS scroll dependency | anchor link puts heading in viewport (`toBeInViewport`) | | Firefox ≤102 | backdrop-filter unsupported | -webkit- prefix + rgba background fallback | overlay readable; modal content visible | | Firefox (current) | cross-document View Transitions flagged off | progressive enhancement; instant nav fallback | navigation completes; target page heading visible | ``` Keep one row per divergence. A row with no ticket and no fallback is an open bug, not a documented issue. --- ## Testing Patterns The core patterns and the rules that govern them: - **Same test, multiple browsers** — the default. Write the test once; configure projects to run it everywhere. Never duplicate test logic per browser. - **Browser-specific test logic** — branch on `browserName` only when behavior *genuinely* differs (the WebKit date-input fallback and Chromium-only clipboard permission a
Skill source recorded
Skill instructions are recorded. This is not a runtime test, safety guarantee or compatibility certification.
Review before install: Avoid automatic install
License: MIT
Listed tools are metadata hints, not tested compatibility. Agent prompts are suggested handoffs.
Repository metadata and review signals are advisory. Popularity, source discovery and successful execution are different facts.
Version reported in registry metadata; check source releases before relying on it.
Quality
61/100
Promising
Trust
60/100
This page exposes the same decision, trust, audit, use-case, and install signals through the Registry API, so agents can rank this skill without scraping the UI.
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"High-risk permission hints: Shell or command execution, Secrets or environment access",
"Dependency or permission surface needs review",
"Permission surface may require sandboxing",
"Financial research output is not financial advice; require human review before any live investment decision",
"Financial research output is not financial advice; require human review before any live investment decision."
],
"agent_contract": {
"task_input": "Use cross-browser-testing in an agent workflow",
"recommended_action": "Do not auto-install. Inspect the source, dependencies, and permission surface first.",
"install_policy": "block",
"minimum_review_before_use": [
"Trust: 68/100 Manual review",
"Audit: 71/100 Needs review",
"Safety: 27/100 Avoid automatic install",
"Review repository, license, install command, and permission surface before production use."
],
"expected_agent_output": {
"selected_skill": "petrkindlmann-cross-browser-testing (cross-browser-testing)",
"install_command": "npx skills add petrkindlmann/qa-skills --skill cross-browser-testing",
"risk_summary": "Needs review; Blocked for auto-install; Review before production",
"verification_result": "Report the smallest successful task, files touched, warnings, and any missing setup."
}
},
"outcome_feedback": {
"endpoint": "https://www.openagentskill.com/api/agent/outcome",
"method": "POST",
"requires_resolve_event_id": true,
"event_id_source": "Use install_receipt.outcome_feedback.event_id or feedback.event_id returned by /api/agent/resolve for the current task.",
"expected_outcomes": [
"success",
"failed",
"not_relevant",
"blocked_by_risk",
"setup_required"
],
"payload_template": {
"event_id": "<install_receipt.outcome_feedback.event_id or feedback.event_id from /api/agent/resolve>",
"skill_slug": "petrkindlmann-cross-browser-testing",
"task": "Use cross-browser-testing in an agent workflow",
"agent": "codex",
"outcome": "success",
"install_used": true,
"risk_blocked": false,
"setup_required": false,
"task_success": true,
"output_quality": 4,
"error_type": null,
"human_review_required": false,
"workspace": "sandbox",
"time_to_useful_ms": 120000,
"notes": "Report the smallest successful task, setup friction, files touched, and risk notes."
}
},
"endpoints": {
"web": "https://www.openagentskill.com/skills/petrkindlmann-cross-browser-testing",
"api": "https://www.openagentskill.com/api/agent/skills/petrkindlmann-cross-browser-testing",
"audit": "https://www.openagentskill.com/skills/petrkindlmann-cross-browser-testing/audit",
"eval": "https://www.openagentskill.com/api/agent/evals?slug=petrkindlmann-cross-browser-testing&task=Use%20cross-browser-testing%20in%20an%20agent%20workflow&max_risk=medium",
"resolve": "https://www.openagentskill.com/api/agent/resolve?task=Use%20cross-browser-testing%20in%20an%20agent%20workflow&agent=codex&max_risk=medium",
"receipt": "https://www.openagentskill.com/api/agent/receipt?task=Use%20cross-browser-testing%20in%20an%20agent%20workflow&agent=codex&max_risk=medium&format=text",
"install": "https://www.openagentskill.com/api/skills/petrkindlmann-cross-browser-testing/install",
"manifest": "https://www.openagentskill.com/api/registry/manifest/petrkindlmann-cross-browser-testing"
}
}Listing source
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Audit
71/100
Needs review
Copies are not installs. Installation counts require a reported successful installation; they are not a blanket quality guarantee.