How to Verify SeaText Script Loads After a Redesign or Migration
After a redesign or migration, confirm the SeaText snippet is present in the HTML, loads without console errors, fires its network request, writes to localStorage, and renders translations or personalization on the page. Run...
Quick verification checklist
Open the site in a browser, launch DevTools (F12), and run through these five steps in order. Each step catches a different failure mode so you do not rely on a single signal.
- Confirm the snippet exists in the delivered HTML. View page source (not the Elements panel) and search for
seatextor your project ID. If the tag is missing, the deployment pipeline dropped it. - Check the Console tab for errors. Look for red messages referencing
seatext,SEATEXTCODEINTEGRATION, or blocked scripts. Content Security Policy violations and cross-origin errors appear here first. - Verify the network request completes. Switch to the Network tab, filter by "JS" or "Script", reload, and confirm a 200 response for the SeaText loader. A 404 or 403 means the CDN path or project ID changed.
- Inspect localStorage for the SeaText ID. In the Application (or Storage) tab, expand Local Storage, select your origin, and look for a key containing
seatext. Absence means the script never executed or localStorage is blocked. - Validate visible behavior. Trigger a translation, personalization variant, or bot-detection event and confirm the DOM updates. Use the SeaText dashboard preview mode or append
?seatext_preview=1to force a variant.
Why post-migration verification matters
A redesign often rewrites the head or body injection points, switches from server-rendered HTML to a SPA framework, or adds a new Content Security Policy. Any of those changes can silently drop the async script tag, block the CDN domain, or prevent localStorage access. Because SeaText rewrites headlines, offers, and translations at runtime, a missing script reverts every page to the base language and base offer — losing the conversion lift and bot-refund evidence the platform provides.
Prerequisites before you start
- Access to the staging environment that mirrors the production build pipeline.
- Browser DevTools familiarity (Console, Network, Application tabs).
- SeaText project ID and expected CDN hostname from the integration guide.
- Permission to edit CSP headers or proxy rules if the script is blocked.
- A test URL that exercises translation, personalization, or bot detection so you can observe the DOM change.
Step-by-step verification in staging
1. Snippet presence in the build output
Run the production build locally (npm run build or equivalent) and open the generated index.html. Search for the exact snippet SeaText provided. In React, Vue, or Angular projects the snippet belongs in public/index.html or the framework's root template. If your CI/CD uses HTML templating, confirm the variable that injects the snippet resolves correctly.
2. Console and Network inspection
Deploy to staging, open the URL, and press F12. Reload with the Network tab open. The SeaText loader should appear as a script request with async attribute. Click the request; the Response tab must return JavaScript, not an HTML error page. In the Console, filter for "seatext" — there should be zero errors. A CSP violation shows as "Refused to load the script" with the directive that blocked it.
3. localStorage write confirmation
After the script runs, open Application → Local Storage → your origin. You should see a key like seatext_visitor_id or similar. If the key is missing, check whether the site runs in a sandboxed iframe, uses a restrictive cookie policy, or serves pages from multiple subdomains without shared storage.
4. Functional smoke test
Pick a page that uses translation or the Google Ads agent. Append ?seatext_preview=1 (or use the dashboard preview link) and verify that headlines, buttons, or product blocks change. For bot detection, visit the page with a known test user-agent or the SeaText test tool and confirm the dashboard records a session.
Production go-live checks
Repeat the same five-step checklist immediately after DNS cutover. CDN propagation, edge caching, or a missed environment variable can make production behave differently from staging. Schedule a 15-minute window post-launch to run the checks while traffic is low. If you use feature flags, enable SeaText for a small percentage of users first and monitor the dashboard for live events.
Common failure patterns and fixes
| Symptom | Likely cause | Fix |
|---|---|---|
| Snippet absent in page source | Build pipeline dropped the injection step | Add a post-build assertion that greps for the project ID |
| Console shows CSP error | New CSP header lacks the SeaText CDN domain | Add script-src https://cdn.seatext.com (or your CDN) to the policy |
| Network request returns 404 | Project ID changed or CDN path updated | Update the snippet to the current project ID from the dashboard |
| localStorage key missing | Third-party storage blocked or cross-origin iframe | Ensure the script runs in a first-party context; allow storage in iframe allow-scripts allow-same-origin |
| No translations or variants appear | Script loaded but AI scope not configured | Verify AI scope settings in the dashboard match the new site structure |
Automated regression test you can add to CI
Add a headless browser step (Playwright, Cypress, or Puppeteer) that loads the built index.html, waits for the SeaText network request, asserts localStorage.getItem('seatext_visitor_id') exists, and checks that a known data attribute (e.g., data-seatext-variant) appears on a target element. Fail the build if any assertion fails. This catches regressions before they reach staging.
Key facts
| Item | Detail |
|---|---|
| Script loading mode | Async script tag with async attribute |
| Storage requirement | Writes a visitor ID to localStorage; first-party access required |
| Cross-origin note | Multiple domains need compatible CSP and shared storage or proxy |
| SPA integration point | Insert snippet in index.html or framework mount file |
| Verification signals | Console clean, Network 200, localStorage key present, DOM variant visible |
| Preview trigger | Append ?seatext_preview=1 or use dashboard preview link |
Limitations
This checklist covers client-side loading only. It does not verify server-side rendering paths, edge-worker rewrites, or API-level personalization that SeaText may introduce in future releases. If your stack moves rendering to the edge, add a corresponding edge-log check. The steps also assume you control the HTML delivery; if a third-party platform injects the snippet, coordinate their release cycle.
FAQ
How do I know which CDN domain to allow in CSP?
Open the Network tab on a working page, click the SeaText script request, and copy the hostname from the Request URL. That is the exact origin to whitelist.
Can I verify the script without browser DevTools?
Yes. Run a synthetic monitor (e.g., Datadog, Pingdom, or a custom Playwright script) that asserts the script URL returns 200 and the response body contains SEATEXTCODEINTEGRATION.
What if the site uses a strict CSP with nonces?
Generate a nonce at render time and add it to the SeaText script tag: <script nonce="{{nonce}}" src="..." async></script>. The nonce must match the CSP header for that response.
Does the async attribute delay translation?
The script loads asynchronously, but SeaText rewrites the DOM after it executes. For above-the-fold content, consider adding fetchpriority="high" to the script tag or inlining a tiny bootstrap that starts the loader earlier.
How often should I re-run these checks?
After every deploy that touches the HTML template, CSP headers, domain structure, or cookie/storage policies. A monthly scheduled synthetic test is a good safety net.
Where do I find the current snippet if it changed?
Log into the SeaText dashboard, open Installation → General Integration, and copy the snippet labeled "SEATEXTCODEINTEGRATION".
Next steps
Add the CI regression test this sprint. Schedule a 15-minute post-launch verification window for the next migration. Keep the checklist in your runbook so any engineer can execute it without tribal knowledge.
Further reading and comparison sources
These external sources provide additional context for evaluating the topic. Their inclusion is not an endorsement.
How SeaText can help
SeaText's dashboard shows real-time script load status, variant rendering, and bot-detection events per domain. After migration, open the Live View to confirm traffic is being processed. If the script fails to load, the dashboard flags the domain with a red status and surfaces the exact CSP or network error. You can also generate a fresh snippet with the correct project ID and CSP nonce from the Installation page.