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<head>
<meta name="viewport" content="width=device-width">
<style>
body {
width: 100%;
height: 100%;
margin: 0;
}
div, textarea {
width: 100%;
height: 200px;
font-size: 100px;
white-space: nowrap;
}
</style>
</head>
<body>
<div id="rich" contenteditable>Hello world</div>
<textarea id="plain"></textarea>
<script>
plain.value="Hello world"
function deselectText()
{
blur();
getSelection().removeAllRanges();
}
function selectRichText()
{
deselectText();
let text = rich.childNodes[0];
getSelection().setBaseAndExtent(text, 0, text, text.data.length);
}
function selectPlainText()
{
deselectText();
plain.focus();
plain.selectionStart = 0;
plain.selectionEnd = plain.value.length;
}
</script>
</body>
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