The main menu in alpha uses a different selector(s) from the main menu button. This has resulted in additional css rules and JS code in our stable site.
e.g.
'#mw-mf-main-menu-button, .alpha .header a.header-icon, .alpha .header .header-title a'

This is really not acceptable, no matter how minor - it makes the code less readable, it risks regressions in stable and if done too many times can cause problems with firstPaint time and redundant css.

Please make this a single selector and add classes to the elements it applies to.