Answers for "click to call button html"

html telephone link

One click should open the phone dialler and input the number to be called.
<a href="tel:5551234567">Call (555)123-4567</a>

html make phone number callable

Area code with dashes, 1 and + sign

<a href="tel:+1-555-555-1212">555-555-1212</a>
Area code with no dashes, 1 and + sign

<a href="tel:+15555551212">555-555-1212</a>

phone number button on website

<a href="tel:5554280940">Call us at 555-428-0940</a>

calling function on click html

<img src="hospital.png" id="hospitals" onclick="damarkers();">