Note non-standard behavior of view transitions for forms set to post

withastro/astro#9466

src/content/docs/en/guides/view-transitions.mdx

@@ -376,6 +376,14 @@ The `<ViewTransitions />` router will trigger in-page transitions from `<form>`
 
 By default, your page will transition after a form is submitted, even if you are using `event.preventDefault()` to prevent this behavior.
 
+Please note that if your method is set to `post`, the default behavior of web browsers is to submit your form data encoded as as `application/x-www-form-urlencoded`, but the default behavior of Astro is to submit your form data as `multipart/form-data`. If you want to match the default behavior of web browsers make sure to set the `enctype` attribute accordingly:
+
+```astro title="src/components/Form.astro"
+<form action="/contact" method="post" enctype="application/x-www-form-urlencoded">
+  <!-- -->
+</form>
+```
+
 You can opt out of router transitions on any individual form using the `data-astro-reload` attribute:
 
 ```astro title="src/components/Form.astro"