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

JSFiddle - React, Tailwind, and code Playground

HTML

<input type="button" id="toLowerCase" value="to LC" />
<textarea id="MainText">some Text</textarea>

JavaScript

document.getElementById('toLowerCase').onclick = function() {
		var LowerString = document.getElementById('MainText').value.toLowerCase()
		document.getElementById("MainText").value = LowerString
	}

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JSFiddle - React, Tailwind, and code Playground

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JavaScript

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