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var kids = [].slice.apply(document.body.children);

for (var i = 0, l = kids.length; i < l; i++) {
	switch(kids[i].tagName.toLowerCase()){
		case "header":
		case "nav":
		case "aside":
		case "footer":
			break;
		default:
			kids[i].classList.add('its-some-content');
			break;
	}
	break;
}