How to determine which side has the error (client or server) if the button is not displayed on the page?

To determine which side has the error (client or server) when a button is not displayed on the page, you can follow these steps:

1. Client-side check:

   • Open developer tools in your browser (F12).
   • Look in the DOM to see if the button element exists.
   • Check CSS styles — the button might be hidden (display: none or visibility: hidden).
   • Check the console for JavaScript errors that might prevent display.

2. Server-side check:

   • See if the server is sending the correct HTML with the button.
   • Check API requests, if the button depends on data, ensure the server returns the necessary data.
   • Look at server logs for errors.

3. Conclusion:

   • If the button is missing in the source HTML — likely a server-side issue.
   • If the button exists but is not visible or not working — a client-side problem.

This approach helps localize the problem and understand where to look for the cause.