A button with type "submit" will happily submit the form when you click on it. If you want it to look like a link, use CSS. Putting the submit on the anchor tag

A button with type "submit" will happily submit the form when you click on it. If you want it to look like a link, use CSS. Putting the submit on the anchor tag is pointless- the lack of a type on the button itself means the browser is inferring the intended behavior and defaulting to type "submit" rather than type "button". As others have mentioned, the main downside is likely accessibility.