JSFiddle - React, Tailwind, and code Playground

HTML

<b class="xyzxterms" style="cursor: default; ">bryant keil bio</b>

<b class="xyzxterms" style="color:red">bryant keil bio</b>

<b class="xyzxterms" style="color:blue">bryant keil bio</b>

CSS

h1 {
  font-size: 300%
}

.strike{text-decoration: line-through;}

JavaScript

$.fn.changeElementType = function (newType) {
        var newElements,
            newElement;

        this.each(function () {
            var attrs = {};

            $.each(this.attributes, function () {
                attrs[this.nodeName] = this.nodeValue;
            });

            newElement = $("<" + newType + "/>", attrs).append($(this).contents());

            $(this).replaceWith(newElement);

            if (!newElements) {
                newElements = newElement;
            } else {
                $.merge(newElements, newElement);
            }
        });

        return $(newElements);
    };

$("b").changeElementType("h1").addClass('strike');