Your current method fails, because HTML properties are not defined for the given XML document. If you supply the text/html MIME-type, the method should work.
var string = '<!DOCTYPE html><html><head></head><body>content</body></html>';
var doc = new DOMParser().parseFromString(string, 'text/html');
doc.body.innerHTML; // or doc.querySelector('body').innerHTML
// ^ Returns "content"
The code below enables the text/html MIME-type for browsers which do not natively support it yet. Is retrieved from the Mozilla Developer Network:
/*
* DOMParser HTML extension
* 2012-02-02
*
* By Eli Grey, http://eligrey.com
* Public domain.
* NO WARRANTY EXPRESSED OR IMPLIED. USE AT YOUR OWN RISK.
*/
/*! @source https://gist.github.com/1129031 */
/*global document, DOMParser*/
(function(DOMParser) {
"use strict";
var DOMParser_proto = DOMParser.prototype
, real_parseFromString = DOMParser_proto.parseFromString;
// Firefox/Opera/IE throw errors on unsupported types
try {
// WebKit returns null on unsupported types
if ((new DOMParser).parseFromString("", "text/html")) {
// text/html parsing is natively supported
return;
}
} catch (ex) {}
DOMParser_proto.parseFromString = function(markup, type) {
if (/^s*text/htmls*(?:;|$)/i.test(type)) {
var doc = document.implementation.createHTMLDocument("")
, doc_elt = doc.documentElement
, first_elt;
doc_elt.innerHTML = markup;
first_elt = doc_elt.firstElementChild;
if (doc_elt.childElementCount === 1
&& first_elt.localName.toLowerCase() === "html") {
doc.replaceChild(first_elt, doc_elt);
}
return doc;
} else {
return real_parseFromString.apply(this, arguments);
}
};
}(DOMParser));
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