Here are the options I've thought about for attribute update syntax
Option 1. Certain types of html elements where the most common use case is attribute update, such as <img>, <iframe>, <input>, <link>, <object>, <param>... and <a> update the logical attribute by default.
$('<a id="target" href="http://yahoo.com"><span id="text">Yahoo</span></a>')
.weld({target:'http://google.com', text: 'Google'});