Better document.write

document_write.js

( function( doc ) {
	'use strict';
	
	var createFragment = ( function( template ) {
		// http://stackoverflow.com/a/25214113
		if ( template ) {
			return function( html ) {
				var elem = document.createElement( 'template' );

				elem.innerHTML = html;

				return elem.content;
			};
		}
		// http://stackoverflow.com/a/9285046
		else {
			return function( html ) {
				var elem = document.createElement( 'div' ),
					frag = document.createDocumentFragment(),
					child;

				elem.innerHTML = html;

				while ( child = elem.firstChild ) {
    				frag.appendChild( child );
				}

				return frag;
			}
		}
	} ( 'content' in document.createElement( 'template' ) ) ),
	lastInserted,
	lastParent;

	doc.write = function( html ) {
		var script = document.currentScript,
			frag = createFragment( html );

		// Probably jQuery Ajax request.
		if ( !script ) {
			// Assumes jQuery $.get.
			var scripts = document.getElementsByTagName( 'script' ),
			regex = new RegExp( 'document\\.write\\([\'"]' + html + '[\'"]\\)' ),
			i = 0,
			tmp;

			while ( tmp = scripts[ i++ ] ) {
				if ( regex.test( tmp.innerHTML ) ) {
					script = tmp;
				}
			}
		}

		if ( script && script.parentNode ) {
			lastInserted = frag;
			lastParent = script.parentNode;

			return script.parentNode.replaceChild( frag, script );
		}
		else {
			if ( lastParent && lastInserted ) {
				return lastParent.insertBefore( frag, lastInserted.nextSibling );
			} else {
				document.body.appendChild( frag );
			}
		}
	}
} ( document ) );