Creating a full-fledged page authority checker like the one you referred to would involve server-side scripting to handle HTTP requests and process the responses, as well as an API that provides page authority metrics, which is typically a paid service.
However, I can provide you with a simple HTML form and JavaScript that outlines how you could start building such a tool for personal use. You'd need to integrate an actual service API for checking page authority to replace the placeholder function.
Here's an example of what the HTML structure with embedded JavaScript could look like:
```html
Bulk Check Page Authority
```
This code provides a basic form where you can enter URLs, one per line, and a results area where the page authority scores would be displayed. The `checkPageAuthority` function is a placeholder and would need to be replaced with a real implementation that makes an API call to a service that provides such metrics.
Please note that to create a tool that interfaces with a real page authority checking service, you would need access to such a service's API, which may require an API key and possibly payment. Additionally, making multiple rapid requests to external services may require handling rate limits and other API usage policies.
