prismdinstrument

EXTRACTED · 8 SECTIONS · 16 COLORS · GRADE C

developer.mozilla.org

Accent #5e6ad2 · Inter — every value below measured via getComputedStyle(), not asserted by hand.

colors

faces

DESIGN.md tokens.json

real render · source of truth

developer.mozilla.org is built on a pure-white canvas (rgb(255,255,255)). The system uses rgb(255, 255, 255) as the singular interactive color. Sharp 0px corners on CTAs — architectural restraint, engineering precision alongside Inter as the primary typeface. Depth comes from borders and surface contrast rather than shadows — a flat, structural elevation model. Motion is minimal — a few targeted transitions, no decorative animation.

Color — roles, semantics & the full census

16 colors measured · click any swatch to copy

Canvas

#ffffff

AAA 18.88:1

Ink

#111111

AAA 18.88:1

Accent

#ffffff

Fail 1:1

Line

#51565d

AAA 7.4:1

Semantic states

No semantic state colors detected — this system signals state through weight & motion, not hue.

16 colors mined from the live renderexpand

Type — the ladder, in the real face

6 roles · rendered live in the real Inter (captured woff2) · lines are editable, click any spec to copy

display xl

display-xl40px · 400

display md

display-md16px · 500 · ×2.50

body

body12.8px · 500 · ×1.25

body sm

body-sm16px · 600 · ×0.80

caption

caption12.8px · 500 · ×1.25

button

button14px · 450 · ×0.91

Spacing & radius, made spatial

9 spacing steps · 7 radii · bars are exact px widths

Spacing scale

xxs · 2px

xs · 6px

sm · 12px

md · 13px

base · 16px

lg · 27px

xl · 28px

2xl · 48px

3xl · 64px

Radius

none
0px

xs
4px

sm
8px

md
14px

lg
20px

xl
32px

full
9999px

Components — the closed vocabulary

10 component families · 22 variants counted on the live DOM

Component	Variants found
badges	×3
footer Links	×3
heading H3	×3
buttons	×2
cards	×2
nav Links	×2
heading H2	×2
links	×2
breadcrumb	×2
heading H1	×1

Component style specs (§4)expand

Buttons

Secondary

Background: #6b6b6b
Text: #ffffff {colors.primary}
Padding: 1px 6px
Radius: 0px
Border: 2px outset rgb(255, 255, 255)
Font: 16px weight 400
Use: Secondary action

Ghost

Background: transparent
Text: #ffffff {colors.primary}
Padding: 8px 11.2px
Radius: 0px
Font: 16px weight 400
Use: Subtle action, toolbar, nav button

Light / Invert

Background: #f7f7f8 {colors.surface-2}
Text: #044c9f {colors.primary-hover}
Padding: 12.8px
Radius: 0px
Font: 16px weight 600
Use: Bright CTA on dark sections

Cards & Containers

Standard Card

Background: transparent
Padding: 16px
Radius: 8px
Border: 1px solid rgb(195, 199, 203)
Use: Content containers, listing items

Layout — structure & dimensions

5 layout metrics measured

max Width1200px

header Height98px

sidebar Width0px

gap16px

container Padding24px

Responsive — real breakpoints

fluid system — no hard stops

No distinct @media breakpoints captured at the desktop/mobile pass — this layout is fluid, adapting by ratio rather than hard stops.

Do's & Don'ts

17 enforceable rules pulled verbatim from the spec

Use Inter as the primary typeface — it defines the brand personality

Keep font weights between 400-600 — the system uses a narrow weight range for subtle hierarchy

Use borders for card containment — this design uses border-based depth, not shadow-based

Use White (`#ffffff`) as the primary accent — it's the brand's signature interactive color

Use small 4px radius for buttons — this design system uses subtle rounding, not pill shapes

Apply 16px padding inside cards — matches the design system's content breathing room

Use 8px border-radius on cards — consistent with the grid card corners

Maintain nav height at 66px — consistent vertical space for the navigation bar

Include a search input directly in the nav — discoverability is a primary UX value here

Don't

Don't substitute with generic sans-serif or serif — the custom font carries the brand

Don't use weight 700 (bold) or above — 600 is the maximum weight in this system

Don't use heavy box-shadows for cards — borders are the containment mechanism

Don't introduce additional saturated accent colors — the palette is intentionally controlled

Don't over-round buttons with pill or large radius — the system uses restrained, sharp-ish corners

Don't collapse or hide the nav on scroll without an explicit scroll-triggered animation — the design uses fixed nav presence

Don't make the nav sticky — this design lets it scroll away to maximize content focus

Don't put a CTA button in the nav — this design uses links only at the top

Agent guide & export

Paste-ready prompt + the real files behind this page

Build a UI in the developer.mozilla.org design system. Canvas #ffffff · ink #111111 · accent #ffffff. Type: Inter — respect the size/weight ladder in §3. Radius, spacing, shadow: use only the extracted scales (no magic numbers). Full spec follows — paste the DESIGN.md below into your agent.

Every value above was getComputedStyle-verified.

$ npx prismd add developer

DESIGN.md · narrative spec tokens.json

A · Instrument B · Press