JSFiddle - React, Tailwind, and code Playground
by bluey
HTML
<div id='timer'>
<span id='num' class='num'>0</span>
<span id='num' class='num'>0</span>
<span id='split1' class='split'>:</span>
<span id='num' class='num'>0</span>
<span id='num' class='num'>0</span>
<span id='split2' class='split'>:</span>
<span id='num' class='num'>0</span>
<span id='num' class='num'>0</span>
</div>
JavaScript
/**
every second,
create random char from regex,
write char "different of previous one" to each class='num'AS-span.child of timer.
**/