Button

See Button for the decided part of this page.

Known issues

ID	Kind	What
TITAN-DIV-02	Divergence	`border-focus` is specified and never implemented — Button inherits its focus ring
TITAN-DIV-10	Divergence	Documentation groups by concept; the package exports by unit
TITAN-DIV-11	Divergence	The design vocabulary is prominence; code names the treatment
TITAN-DIV-23	Divergence	The theme’s naive capitalize-every-word doesn’t implement title case’s function-word exceptions
TITAN-GAP-05	Open decision	No selection rule where two tokens both apply
TITAN-GAP-22	Open decision	No component expresses a failed action

Gaps in the current rules

The theme’s title-case rendering doesn’t implement the function-word exception. textTransform: "capitalize" capitalizes every word unconditionally; for most short, verb-first labels that happens to agree with headline style, but they diverge on any label containing a function word like “to” or “of” — “Save Changes To Draft” instead of “Save Changes to Draft” — already recorded above.
The large size is reachable and undefined — see Constraints Titan should enforce below.
tertiary exists as a design term and in no token. The prominence vocabulary is three levels; the token layer names none of them — already recorded above.
Icon-only sizing has no rule. Three icon sizes and two control heights exist; nothing states which pairs.
FilterButton’s applied-state treatment is not specified. It carries a count prop and two of its own tokens, and no page states what an active filter should look like.
No rule for buttons inside dense table rows beyond “use a smaller size”, which does not say which size or what happens in a row that already has three actions.

Constraints Titan should enforce

These are real, currently-true rules. Nothing in code stops a builder from violating them today — each is a placeholder for a guardrail Titan hasn’t built, not a decision still being made.

ID	Constraint	Would be enforced by
TITAN-BTN-01	At most one primary (`variant="contained"`) Button per view region.	Lint scanning a region for more than one `contained` Button.
TITAN-BTN-04	Button labels are 1–3 words.	Lint/prop validator counting words in the label.
TITAN-BTN-05	Never more than 3 Buttons in one action group.	Lint counting Button descendants of an action-group wrapper.
TITAN-BTN-06	A disabled Button is paired with a reachable explanation.	A required `disabledReason` prop, or a lint rule requiring an adjacent Tooltip/`aria-describedby`.
TITAN-BTN-09	An icon-only Button carries an explicit accessible name.	A required accessible-name prop when no text child is present; standard a11y lint.
TITAN-BTN-10	Size is `small` or `medium`, never `large`.	Narrowing the exported `size` type to `'small' \| 'medium'`, or a lint rule flagging `size="large"`.
TITAN-BTN-11	Icon comes before the label, never after (needs confirmation).	Removing `endIcon` from the type, or a lint rule prohibiting it.
TITAN-BTN-13	Labels are title case.	A lint rule/formatter enforcing the exact title-case algorithm (with function-word exceptions) on label strings.

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Known issues

Gaps in the current rules

Constraints Titan should enforce

​Known issues

​Gaps in the current rules

​Constraints Titan should enforce

Known issues

Gaps in the current rules

Constraints Titan should enforce