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No.47 · Controls

Fraction Checkbox

A select-all checkbox that tells the truth about partial states: its box fills in proportion to how many items are checked, and the count rolls beside it.

The prompt

The design brief behind this component — reuse it to regenerate, remix, or explain it.

Design a 'select all' checkbox that shows how partial the selection is. It's a real tri-state control (checked when all are, indeterminate when some are), but its 20px box is a tiny gauge: an accent fill rises from the bottom to exactly the fraction of children checked (520ms expo-out), with a faint meniscus line at the level; only at 100% does the ring turn accent and a tick draw in. Beside it: the group title and a mono count ('2 of 5') whose number rolls in on change. Children are ordinary checkboxes (hidden native input + drawn box): the box fills with the accent and the tick draws; the row's label brightens; an optional mono meta sits on the right. Everything is inside a fieldset with a legend.

Notes

Interaction
Toggle individual items or the parent; the parent's fill tracks the fraction.
Motion
Level 520ms expo-out; tick draws 320ms (the parent's after the fill arrives); count roll 320ms.
Accessibility
Native checkboxes in a fieldset/legend; the parent sets .indeterminate for assistive tech and is described by the live count; focus-visible outlines the whole row. Reduced motion makes it instant.
Responsive
Fluid to 22rem.
On touch
Whole rows are tap targets.

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