niso attributes

niso adds four attributes, all data- attributes so a browser ignores them.

Attribute	On	Meaning
data-niso-surface="<name>"	any element	The element is a surface: niso lays it out but never draws it in the page, and sends it to the named target as a template. Names: widget.small, widget.medium, activity, island.expanded, island.leading, island.trailing, island.minimal, carplay.list.
data-timer-start="<ms>"	<time>, <progress> in a surface	Milliseconds since the Unix epoch. A <time> counts up from it; a <progress> fills from it.
data-timer-end="<ms>"	<time>, <progress> in a surface	A <time> counts down to it; with data-timer-start, a <progress> is full at it.
data-timer-period="<ms>"	<progress> in a surface	With data-timer-start, the progress bar fills every period and starts over.

The timers are drawn by the platform (SwiftUI’s timer text, Android’s Chronometer), so they keep counting in a widget whose page isn’t running. The element’s text content is what shows when the timer is paused and in a browser. How they work, and which targets take which names: Surfaces.