What could be causing the issue of a custom js code not displaying properly on Google indexed pages for a Webflow landing page? Is it possible that there is a bug in the code?

If your custom JavaScript code isn’t displaying or functioning properly on Google-indexed versions of your Webflow landing page, the most common causes involve rendering delays, improper script placement, or blocked resources. A bug in the code is possible, but it’s usually one of several key issues.

1. Code Placement in Webflow

• Ensure the script is added to the correct section: For scripts that affect visible content or interactivity, add the code to the Before tag section in Page Settings or Site Settings → Custom Code.
• If the script manipulates the DOM, placing it in the head may execute it too early—before the page loads fully.

2. Using document-ready or window.onload Events

• If your code runs before content has loaded, it may fail silently.
• Wrap your JS in a DOMContentLoaded or window.onload function, or use jQuery’s $(document).ready() if jQuery is enabled.

3. Code Errors or Syntax Issues

• A JavaScript bug will prevent execution and may affect other scripts. Use Chrome DevTools → Console tab to check for errors.
• Only Google Index renders a page using Chrome 41 (for indexing), which doesn’t support some newer JS syntax (like optional chaining or ES6 imports not compiled). Ensure you’re using backward-compatible code.

4. Blocking in robots.txt or Meta Tags

• If the JavaScript file or script is externally hosted (e.g. from a different domain), ensure that it isn't blocked by robots.txt or CORS restrictions.
• Also confirm you haven't added meta tags like on the affected page.

5. Delayed Script Loading (Lazy Script)

• If you're injecting content via JS (such as dynamic offers or tracking elements), Google’s crawler may not wait for delayed content.
• Use Server-Side Rendering (SSR) or static elements for core content you want indexed.

6. Google Caching an Old Version

• Google may have cached an outdated version of your page before the script was added or fixed.
• Use Google Search Console → URL Inspection → Request Indexing to force re-crawling.

7. Script Depends on User Interaction

• If the code is triggered only on events (like scroll or click), Googlebot won’t trigger those. Use progressive enhancement so core features still render without interaction.

8. Using External JS with Limitations

• If your script relies on an external library or CDN, make sure:
• The URL is accessible to Google.
• The library is fully loaded before your script runs.
• The script doesn’t depend on APIs that block bots (e.g., some marketing/tracking scripts).

Summary

Your custom JS may not display properly on Google-indexed pages because of execution timing, outdated caching, incompatible syntax, blocked resources, or user-triggered events. Use document-ready wrappers, place your code correctly, and verify there are no console errors. Always test the live page using Google's URL Inspection tool to see how Google renders it.