Meter

Meter has no keys of its own and is never focusable: a meter is not a control. A caller who makes it a link through render brings that element's own keys.

What axe won't catch, from the contract, each with how this component meets it:

• Everything the eye is told, the ear is told, for every shape each prop accepts: the eye gets the label, the figure and the fill's length; the ear the label as the name and the figure as aria-valuetext, which Base UI keeps the same text as the shown figure, or a fuller one from getAriaValueText. An unknown value is "—" and an empty track for the eye, "Unknown" for the ear (CR-5). A status color says good or bad by colour alone, so the caller says it in words too, in the label or beside the meter (Do and don't); in forced colours the tint goes and the figure and the words still carry it.
• Every landmark and named region has an accessible name: none here; the root is a meter, named by its label, not a landmark or region.
• Every default label can be overridden: unknownLabel.
• Every shape the type accepts renders, in every variant: label is a ReactNode, and a string, a number, an element and a list each render in every color; value renders 0, min, max, a value outside the range (clamped), a fraction, null, NaN and Infinity (the last three unknown), which Meter.test.tsx renders each of. The Default story gives a string label and a number.
• A hidden copy kept for animation is aria-hidden, and a collapsed region is inert: none here; the fill's transition moves one element, and nothing collapses. The figure is aria-hidden because aria-valuetext says it, not for animation.
• Native semantics first: no native element says "a value in a range" with Perron's look and Base UI's API (<meter> draws its own bar), so Base UI's role="meter" with its aria-value* attributes, and no ARIA of Perron's beyond the aria-valuetext of an unknown value.
• Focus moves in reading order and returns on close: Meter takes no focus and opens nothing.
• Every target is at least size.target-min square: no target; Meter is not pressed.
• Loops stop when the system asks for less motion: no loop; the fill's change is a transition over duration.meter, which the tokens shorten to 0.01 ms under reduced motion (CR-6).

Every word Meter shows comes from the caller, through label, or from Base UI's formatting of the number, but for the one it announces when the value is unknown.

unknown is the key packages/perron/src/locale/en.ts already has for Stat, FactList and Count, so its Danish, Swedish and Norwegian are there; its JSDoc line adds Meter to the components it names. After the label it reads "Reporting live, Unknown", as Stat's does. The figure's digits and percent sign carry no letter, so expectOwnedStrings passes them in every locale; Base UI's "x" is the one letter it would flag (CR-9).

For a caller using the component, with the reason. Each row is a rule: a must row's Don't is never right, a should row's needs a reason, and Checked by says what catches the Don't in a caller's code.