5.2.5.2 list attribute

If you are using an execution context that inherits from the NameRecorderMixin (nearly all do -- see chapter 8) then the execution context will raise a ApplicationError exception if multiple instances of an <al-textarea> tag with the same name are added to a form. The list attribute is used indicate that multiple instances are intentional.

The presence of the list attribute on an <al-textarea> tag makes the request merging in the NameRecorderMixin class place any browser request values for the field into a list (field not present is represented by the empty list).