JSFiddle - React, Tailwind, and code Playground

HTML

<div contenteditable="true" class="visible-borders"></div>

<br>
<br>
       
<div contenteditable="false" class="visible-borders"></div>

CSS

.visible-borders {
    border: solid 1px black;
}

.visible-borders:before {
    content: "\00a0"
}