<% Skin.difflink %>
link to diff action

Sourcecode in Skin/macros.js:
1:   function difflink_macro(param) {
2:      if (this.custom == 1 && !this.layout.skins.getOriginalSkin(this.proto, this.name))
3:         return;
4:      Html.link({href: this.href("diff")}, param.text ? param.text : "diff");
5:      return;
6:   }