html.md

Where should the 'charset' declaration be ?

In the header, within the first 1024 bytes of the document.

See WHATWG - Charset

PATCH/PUT/DELETE methods in a <form> ?

DELETE/PATCH/PUT are not valid values for the method attribute in the HTML5 standard. They were in fact removed from HTML4

Frameworks have a built-in work around, using for example a hidden input:

<input name="_method" type="hidden" value="pacth"/>

• Rails
• Django