Since version 1.6, "data-dojo-attr='foo'" is preferred; "dojoAttr='foo'" will not be supported in 2.0 [1][2].

More details: Dojo 1.x to 2.0 migration guide [3]

[1] http://dojotoolkit.org/features/1.6/html5data-attributes

[2] http://dojotoolkit.org/reference-guide/1.8/releasenotes/1.6....

[3] http://dojotoolkit.org/reference-guide/1.8/releasenotes/migr...