How to create send button ?

Question

How to create send/shear button click to open all available options like whatsapp face book email

Answer 1

its handled by the app using AppLinks.
you cant make a certain app open your custom url. unless you made it yourself

Answer 2

A menu?
It is need css. I'm learning that.

Or if you want a button where the user's have click and it sent him to other site, will be a classic link code.
<a href="m.facebook.com" target="_blank">FaceBook</a>