What potential issue arises when opening both HTML and PHP files in separate windows while testing a form submission?

When opening both HTML and PHP files in separate windows while testing a form submission, the potential issue that arises is that the form data may not be passed correctly from the HTML file to the PHP file. This is because the form action in the HTML file may not be pointing to the correct PHP file. To solve this issue, ensure that the form action in the HTML file points to the correct PHP file where the form data should be processed. 

```php
<!-- HTML form code -->
<form action="process_form.php" method="post">
  <!-- form fields here -->
</form>
```

In the above code snippet, make sure that the `action` attribute of the form element points to the correct PHP file where the form data should be processed (e.g., `process_form.php`).

Keywords

HTML PHP form submission session variables cross-window communication

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