Multi-options web component example

Test that other focused text fields can still submit the form when the Enter key is pressed.

Another text field:

Test the case when the template items don't match the previously-selected items

Fruit:

Apples Bananas

Test the case where:

Vegetables:

Test the case where:

there are no known items on the server-side. The datalist element doesn't exist.
there are no previously-selected items to show
any whitespace in the wrapper is removed to trigger the :empty in the CSS

Drinks:

More cases to test in future:

If a value is added to the text box, and the form is submitted without adding the new item to the list
That the items in the list are ordered alphabetically
That exotic characters and punctuation (other than comma) still work as valid items