contenteditable content is not included in form submission

Phenomenon

When a contenteditable region is inside a <form>, its content is not automatically included in form submission. Unlike <input> and <textarea>, contenteditable content must be manually extracted and added to the form data.

Reproduction example

1. Create a form with a contenteditable div inside it.
2. Enter some content in the contenteditable.
3. Submit the form.
4. Inspect the form data to see if contenteditable content is included.

Observed behavior

• In Chrome on Windows, contenteditable content is not included in form submission.
• The content must be manually extracted and added.
• No automatic form integration exists.

Expected behavior

• Contenteditable content should be included in form submission.
• Or, there should be a standard way to associate contenteditable with form fields.
• Form integration should work seamlessly.