Mailto : Opens a mailing app when clicked.
For example : <a href=”mailto:firstname.lastname@example.org”>Contact Now</a> will compose a mail to email@example.com. Try it yourself and provide valueable feedback.
Dial a Number : Dials a number when clilcked
For example : <a href=”tel:9800000000″ >Call Now</a> will automatically take you to the dial pad of your phone with number prefilled.
Send SMS : Sends a Text Message to someone.
For example : <a href=”sms:980000000000″>Send Message</a> will automatically take you to the messaging app with number prefilled.
Send Whatsapp Message from html link
You can also create a link to start whatsapp chat with someone just by clicking that link. This works fine only in Mobile, on desktop you have to setup whatsapp web before testing
Here are some other attributes of anchor tag which might be helpful for your
Rel=”Nofollow” – To make the link nofollow
Rel=”DoFollow” – To make the link dofollow. By default, all the links are dofollow
target=_blank – To open the link in new tab.
target = _self – To open the link in the same tab.
target = _parent – To open the link in parent Frame.
See Also : How to add WhatsApp click to chat on your website