How to remove the “Dotted Border” on clicking?

Question

As you can see

I want to somehow remove the dotted lines after the button has been clicke

Answer 1

Possible with pure HTML as well:

...

And with JavaScript you can do that on all links:

window.onload = function WindowLoad(evt) {
   //hide focus:
   var arrLinks = document.getElementsByTagName("a");
   for (var i = 0; i < arrLinks.length; i++) {
       arrLinks[i].hideFocus = "true";
}