add new assertion for element attributes
add new assertion for element attributes

alisaifee/holmium.core,jlecount-sungevity/holmium.core,kejkz/holmium.core,tjlee/holmium.core,alisaifee/holmium.core,tjlee/holmium.core,kejkz/holmium.core,jlecount-sungevity/holmium.core,tjlee/holmium.core,kejkz/holmium.core,tjlee/holmium.core,jlecount-sungevity/holmium.core,alisaifee/holmium.core,alisaifee/holmium.core,kejkz/holmium.core,jlecount-sungevity/holmium.core