title: Can a website use webhooks?
body: <p>Ok, this may be super-simple, but I just don't have enough background knowledge to know for sure:</p>
  
  <p>If I define a webhook callback (fer example, a callback in OpenAPI):  can I use that callback from a regular webpage?</p>
  
  <p>I would assume yes, otherwise whats the point: but all the discussions state:</p>
  
  <pre><code>Must be network accessible by the source server
  </code></pre>
  
  <p>AFAIK: the clients browser is very unlikely to be accessible from the browser.  Which would make webhooks unusable for a hosted website.  Is this correct?</p>