nl_tokens: Deletes the value for a property on a node .
pl_tokens: function deleteValueForProperty ( node , name ) { var propertyInfo = getPropertyInfo ( name ) ; if ( propertyInfo ) { var mutationMethod = propertyInfo . mutationMethod ; if ( mutationMethod ) { mutationMethod ( node , undefined ) ; } else if ( propertyInfo . mustUseProperty ) { var propName = propertyInfo . propertyName ; if ( propertyInfo . hasBooleanValue ) { <mask> [ propName ] = false ; } else { node [ propName ] = '' ; } } else { node . removeAttribute ( propertyInfo . attributeName ) ; } } else { node . removeAttribute ( name ) ; } }