JSFiddle - React, Tailwind, and code Playground

HTML

<span style="font:bold 14px Verdana;">LONGESTW</span>
<span style="font:bold 42px Verdana;">ORD</span>
<span style="font:bold 14px Verdana;">&nbsp;</span>
<span style="font:bold 24px Verdana;">ORD</span>
<span style="font:bold 14px Verdana;">&nbsp;</span>
<span style="font:bold 24px Verdana;">regular</span>
<span style="font:bold 14px Verdana;">&nbsp;</span>
<span style="font:bold 32px Verdana;">w</span>
<span style="font:bold 96px Verdana;">id</span>
<span style="font:bold 64px Verdana;">est</span>

JavaScript

$(function () {
    var max = 0, sum = 0, lword = '', mword = '';
    
    var $span = $('span');
    $.each($span, function (idx, el) {
        
        var elTxt = $(el).text().trim();
        
        if (elTxt) {
            sum += $(this).width();
            lword += $(this).text();
        } 
           
       if (!elTxt || $span.length == (idx+1) ) {
            if (sum > max) {
                max = sum;
                mword  = lword;
            }
            sum = 0;
            lword = '';
        } 
    });

    alert(mword + ' ' + max);
});