feat: add font-size and font-weight design tokens#12772
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Adds two-tier design tokens for font sizes and font weights, per the pattern established by spacing/borders/line-heights (issue internetarchive#11555). - New `tokens/font-sizes.css`: 9-step t-shirt primitive scale plus semantic tokens for headings, body, and UI. Heading tokens are decoupled from HTML element — `--font-size-heading-md` is a visual style, not a claim about `<h2>`. Material 3 vocabulary (display/headline/title/label) kept as deprecated aliases so existing ~150 references keep working through migration. - New `tokens/font-weights.css`: 4 primitive weights + 4 semantic (body, heading, emphasis, button). - Moves the M3 font-size block out of `font-families.css`. - Adds a Tokens showcase section to `/developers/design` with live samples for every primitive and semantic token.
First real consumer of the new font-size tokens. Replaces three em-based
declarations that all computed to 12.8px with the absolute
--font-size-meta token (12px). The 0.8px shrink is imperceptible.
- footer { font-size: 0.8em } -> var(--font-size-meta)
- footer h2 { font-size: 1em } -> var(--font-size-meta) (still needed
to override base h2's 24px size)
- footer ul li { font-size: 1em } -> var(--font-size-meta)
The semantic section already defines --font-size-body-large at 16px, so the deprecated alias block doesn't need its own redefinition. Added a section comment noting the name is preserved from the M3 vocabulary.
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Closes part of #11555 (the
font sizes and weightscheckboxes).Summary
static/css/tokens/font-sizes.css— 9-step t-shirt primitive scale (--font-size-2xs…--font-size-3xl) + semantic tokens for headings (--font-size-heading-xs…xxl), body, and UI (meta, label, button, code, chip).static/css/tokens/font-weights.css— 4 primitive weights + 4 semantic tokens (body, heading, emphasis, button).font-families.css. The old names (--font-size-display-large,--font-size-title-medium, etc.) live on as deprecated aliases inside the new file, mapped to the new scale, so the ~150 existing references keep working until migrated./developers/designwith a live sample for every primitive and semantic token — pattern this for future token categories (colors, etc.).components/footer.cssas the first real consumer — three em-based font-size declarations swapped tovar(--font-size-meta).Design notes
spacing.css.--font-size-heading-mdcan appear on any element.heading-*ramp replaces the M3display/headline/titlesplit — those distinctions caused fuzziness in practice.Test plan
getComputedStyle(document.documentElement))label-medium=12px,title-large=22px,display-large=57px, etc.)/developers/designrenders showcase across primitives → semantic-headings → body → UI → weightspre-commit runpasses on changed filesScreenshots
Showcase preview
The new section appears under a Tokens group in the sidebar of
/developers/design, with Font Sizes and Font Weights entries. Each token row shows: token name (monospace), value (rem · px), and a sample rendered at that size/weight.