JSFiddle - React, Tailwind, and code Playground

HTML

<p>
The future of manned space exploration and development of space depends critically on the
creation of a dramatically more proficient propulsion architecture for in-space transportation.
A very persuasive reason for investigating the applicability of nuclear power in rockets is the 
vast energy density gain of nuclear fuel when compared to chemical combustion energy...
</p>

CSS

span.touch {
    font-weight: bold;
}

JavaScript

$(document.body).on('click', 'span', function( event ) {
    $( event.target ).addClass('touch');
});


$('p').html(function( _, html ) {
    return html.split(/\s+/).reduce(function( c, n ) {
        return c + '<span>' + n + ' </span>'
    });
});