Fix issue where 'class' attribute in the 'attr' binding does not workin IE7 or lower. In those instances, one would have to use 'className' and 'class' to support all browsers.
Fix issue where 'class' attribute in the 'attr' binding does not workin IE7 or lower. In those instances, one would have to use 'className' and 'class' to support all browsers.

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