Cross Browser
Runs the same page load across Chromium, Firefox, and WebKit and diffs navigation success, runtime errors, and rendering against Chromium as the reference engine.
One of 119 modules in the GateTest scan suite. Catches the issue before it reaches code review, and on paid tiers opens a pull request with the fix already written.
Example finding from the crossBrowser module
Firefox throws a CSP error Chromium doesn't — engine-specific bug
Why we catch it
Surfacing the user-visible problems static analysis usually pretends don't exist.
The Cross Browser module sits in this category alongside 6 related modules. Together they form one of the layers of a GateTest scan — checks fire in parallel, findings cluster by root cause, and on paid tiers the AI auto-fix loop reads each finding, writes the fix, validates against the scanner, and opens a PR.
How GateTest covers cross browser
- ✓Runs in every scan. Included on the Full ($99), Scan + Fix ($199), and Forensic Scan ($399) tiers. No additional configuration.
- ✓Free CLI.
npm i -g gatetest && gatetest --module crossBrowseragainst any local repo. No paywall on the scanning itself. - ✓AI auto-fix PR. Scan + Fix tier opens a pull request with the fix, a regression test, and a pair-review by a second Claude. Forensic Scan tier adds per-finding diagnosis and cross-finding attack-chain correlation.
- ✓Honest confidence rating. Findings come with high / medium / low confidence so noisy patterns don't block the gate. The confidence-calibrator trainer reads customer suppressions and tightens rules over time.
Scan your repo for cross browser
Free preview of the headline findings. Pay per scan — no subscription.
Frequently asked questions
What does the Cross Browser module catch?
Runs the same page load across Chromium, Firefox, and WebKit and diffs navigation success, runtime errors, and rendering against Chromium as the reference engine. Example finding: Firefox throws a CSP error Chromium doesn't — engine-specific bug
Does GateTest fix Cross Browser issues automatically?
Yes — on the Scan + Fix tier ($199) and Forensic Scan tier ($399), Claude reads the finding, writes the fix, validates against the scanner, writes a regression test, and opens a pull request for your review.
Which tiers include the Cross Browser module?
The Full tier ($99), Scan + Fix tier ($199), and Forensic Scan tier ($399) include all 119 modules including Cross Browser. The Quick tier ($29) only includes 4 essential modules.
Can I run the Cross Browser module from the CLI for free?
Yes — install with `npm i -g gatetest` and run `gatetest --module crossBrowser` against any local repository. Paid tiers add AI auto-fix and the cross-finding correlation work.