JSFiddle - React, Tailwind, and code Playground
HTML
<script type="text/javascript">
<!--
function viewdiv(id){
var el=document.getElementById(id);
if(el.style.display=="block"){
el.style.display="none";
} else {
el.style.display="block";
}
}
//-->
</script>
<p><a href="#" onclick="viewdiv('mydiv');">Показать блок</a></p>
<div id="mydiv" style="display:none;">text text text</div>