Fixes #6

_src/HtmlToAbsoluteUrls.js

@@ -0,0 +1,20 @@
+const posthtml = require('posthtml');
+const urls = require('posthtml-urls')
+const absoluteUrl = require("./AbsoluteUrl");
+
+module.exports = function(htmlContent, base) {
+  let options = {
+    eachURL: function(url, attr, element) {
+    	// #anchor in-page
+    	if( url.trim().indexOf("#") === 0 ) {
+    		return url;
+    	}
+
+    	return absoluteUrl(url, base);
+    }
+  };
+
+  let modifier = posthtml().use(urls(options));
+
+  return modifier.process(htmlContent);
+};