Horizon/MetadataWidgetMultivalueSelectionProposal

Empty widget
Widget is presented in textarea rather than select with multiple attribute.

Multiple values
User is able to select multiple values. User can remove previously selected values using x button next to each value or simply taping backspace on the keyboard.

Multiple lines of values
Widget supports multiple lines of values when there is no space left in single line.

Expandable list of possible values
Possible values are shown in expandable list after focusing on widget. Once chosen, tags are grayed ant can't be selected again.

Filtering possible values
User can start typing to filter list of possible values. Widget is showing adequate message when no possible tag matches filled word.