mootools/mootools-core — pull request #2140 by ibolmo (2011-11-28 15:03:16+00:00)
Title: Fix #2000. Element.erase caused unexpected values for the attributes

Added a feature detect if the browser sets 'null' instead of null in the
attribute.

Added a `Element.Property` for class.

TESTED: Opera 11, Safari 5, Firefox 3-5, 8, 10, Chrome latest, IE6-9.