Assuming you only want children of body element...
Example HTML
<html><head>
<meta http-equiv="content-type" content="text/html; charset=UTF-8">
<title> Example</title>
</head>
<body>
a <div>b<span>c</span></div>
</body></html>
JavaScript
var body = document.body;
var textContent = body.textContent || body.innerText;
console.log(textContent); // a bc
You need to check for textContent because our good friend IE uses innerText instead.
It is much easier if you have a library such as jQuery, i.e. $('body').text().
Also, it can be achieved on the server side, such as strip_tags() in PHP. However, if you only wanted the body element, you'd need to drill down to it using a DOM parser such as DOMDocument.
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