Edit fiddle - JSFiddle - React, Tailwind, and code Playground

JSFiddle - React, Tailwind, and code Playground

HTML

<script>
  function sizing(elem,add)
  {
  	var span = document.getElementById(elem.getAttribute('data-id'));
    var size = parseInt(span.style.fontSize,10)+add;
    span.style.fontSize = size+'px';
  }
</script>
<input type="button" value="<" data-id="text" onclick="sizing(this,-5)">
<input type="button" value=">" data-id="text" onclick="sizing(this,5)">
<br>
<span id="text" style="font-size:15px;">text</span>

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JSFiddle - React, Tailwind, and code Playground

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Use pre-released features

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