JSFiddle - React, Tailwind, and code Playground

HTML

<a href="http://stackoverflow.com
      /questions/
      22831988/
    string-attribute-values-in-multiple-lines-html">
LINK
</a>

JavaScript

var anchor = document.getElementsByTagName("a");

for(var i=0; i<= anchor.length; i++) {
    var href = anchor[i].href.replace(/%20/g,'');
    anchor[i].href = href;     
}