Broken before persuasion even gets a chance.

• Every ad platform's pixel fires on this specific page, confirmed in each platform's own test tool, not assumed from a global site tag.
• The pixel fires once, not once per tag-manager trigger stacking on top of another.
• UTM parameters survive any redirect the page performs, rather than getting stripped.
• A test conversion has actually been completed end-to-end, not just checked in the tag debugger.

• The form's success state — message, redirect or thank-you page — actually happens on real submission, not just visually in the builder preview.
• Required-field validation matches what the backend actually requires — a field marked optional that's silently required breaks silently.
• A test submission has been checked to confirm it lands wherever it's supposed to — CRM, inbox, spreadsheet.
• Autofill works correctly for name, email and phone — mislabelled fields cause silent autofill errors most visitors won't report.

• Tested on an actual phone, not just the browser's device-emulator view.
• Tap targets — buttons, form fields — are large enough to hit without zooming.
• Nothing critical is hidden below a fold that requires more than two scrolls on mobile.
• Page load has been tested on a throttled connection, not just office wifi.

• The cookie or consent banner does not block the page's own primary call to action from being visible or clickable.
• Consent choices are respected — tags don't fire for a visitor who declined, confirmed by checking the network requests.
• Any required legal text — terms, privacy link, disclaimers — is present and not just assumed to exist from another page.

Run this against the actual live URL after every template change, not the staging version — a fix that works in staging and never gets pushed is the most common way this list gets skipped.