JSFiddle - React, Tailwind, and code Playground

HTML

<p class="taggable">
   Hello world, lorem ipsum attack on titan.
</p>

<p>
   JS doesn't affect this text. 
</p>

CSS

p {
  font-size:20px;
}

JavaScript

jQuery(document).ready(function(e){

    (function(els){
        for(var i=0;i<els.length;i++){
            var el = els[i];
            el.addEventListener('mouseup',function(evt){
                if (document.createRange) { // Works on all browsers, including IE 9+
                    var selected = window.getSelection();
                    /* if(selected.toString().length){ */
                    var	d = document,
                        nA = selected.anchorNode,
                        oA = selected.anchorOffset,
                        nF = selected.focusNode,
                        oF = selected.focusOffset,
                        range = d.createRange();

                    range.setStart(nA,oA);
                    range.setEnd(nF,oF);

                    // Check if direction of selection is right to left
                    if(range.startContainer !== nA || (nA === nF && oF < oA)){
                        range.setStart(nF,oF);
                        range.setEnd(nA,oA);
                    }

                    // Extend range to the next space or end of node
                    while(range.endOffset < range.endContainer.textContent.length && !/\s$/.test(range.toString())){
                        range.setEnd(range.endContainer, range.endOffset + 1);
                    }
                    // Extend range to the previous space or start of node
                    while(range.startOffset > 0 && !/^\s/.test(range.toString())){
                        range.setStart(range.startContainer, range.startOffset - 1);
                    }

                    // Remove spaces
                    if(/\s$/.test(range.toString()) && range.endOffset > 0)
                        range.setEnd(range.endContainer, range.endOffset - 1);
                    if(/^\s/.test(range.toString()))
                        range.setStart(range.startContainer, range.startOffset + 1);

                    // Assign range to selection
                   ...