[en] Button Pattern

Hi W3C organization

I am working and researching about web accessibility for 4 years now. I would like to inform you guys that there are no direct indication about button look or appearance. Default buttons styles are not followed by almost all origination. Buttons are very essential for everyday users and strongly focusing on that will be my humble request. I would strongly expect a improvement following the list down below - 
- Buttons should have some indication that it's a button
- Indication of button or the border should have minimum contract ratio, I will suggest same for the link underline.
- Only use of color shouldn't be acceptable if it doesn't pass the minimum contract ratio.

I would love to see changes made for this purpose and if not I will request to have a explanation about that for my learning development. I can provide explaination for my request requirements if needed.

Thank you
Emam Emon
+18563459792
eh.emon@icloud.com