JSFiddle - React, Tailwind, and code Playground

HTML

<p>The test passes if the text below <strong>does not</strong> extend outside of the box.</p>

<div>Thisisaverylongstringoffillertextwithoutspaces.</div>

CSS

p {
    margin: 1em 0;
}

div {
        border: solid 2px blue;
        width: 10em;
        word-wrap: break-word;
    }