Convert html to xhtml with IE9

convert.js

//IE9 + 

var doc = new DOMParser().parseFromString('<img src="foo">', 'text/html');
var result = new XMLSerializer().serializeToString(doc);

// or
var di = document.implementation;
var hd = di.createHTMLDocument();
var xd = di.createDocument('http://www.w3.org/1999/xhtml', 'html', null);
hd.body.innerHTML = '<img>';
var img = hd.body.firstElementChild;
var xb = xd.createElement('body');
xd.documentElement.appendChild(xb);
console.log('html doc:\n' + hd.documentElement.outerHTML + '\n');
console.log('xhtml doc:\n' + xd.documentElement.outerHTML + '\n');
img = xd.importNode(img); //or xd.adoptNode(img). Now img is a xhtml element
xb.appendChild(img);
console.log('xhtml doc after import/adopt img from html:\n' + xd.documentElement.outerHTML + '\n');

first solution doesn't work in all versions of IE9.