# [css-ui](../../../#readme)/[components](../../#readme)/[header](../#readme)/popdown ## CDN ```html ``` ## Usage **Each `` requires a `tabindex`!** The popdown container must match `body > header > ol`, containing one of the following: ### Simple button ```html
    • ``` ### Countable list ```html
    1. New message (1)
    2. New message (2)
    3. New message (3)
    4. New message (4)

    Default message, visible when the list is empty

    • ``` ### Empty countable list container (no counter) ```html

  • Default message or notification

    • ```