U.S. Web Design System (USWDS)

合衆国ウェブデザインシステム / 2015– / Style / Design Systems

The design language of United States federal websites, published by the General Services Administration. Color, spacing, and type size are quantized into a limited set of discrete options instead of the open range CSS allows, and the system ships Public Sans, a neutral face drawn from Libre Franklin, so that every agency site speaks in the same voice.

Body text runs large and lines wrap somewhere between 45 and 90 characters / The same two colors recur across agencies, a deep blue #005EA2 and an alert red #D83933 / Spacing never lands on an arbitrary number, only on steps of a fixed scale / Public Sans carries everything from headings to body text, wide set and free of quirks

Vote.gov のベンガル語版画面 2026年 — Wikimedia Commons / CC0

Dictionary entry

Best used for
Building sites for a public body where separate departments must not drift into separate looks · Producing an application form that has to stay readable for people you cannot choose a device or a connection for
Type
Public Sans throughout, body text at 16px or larger, lines held between 45 and 90 characters, line height at least 1.5 for long passages.
Composition
Every margin and measure is picked off a fixed scale; a single column is the default and the gaps between elements repeat the same steps.
Material
Deep blue #005EA2 leads and red #D83933 follows, with grays taken only from the fixed run between #1B1B1B and #F0F0F0, never mixed in between.
Caution
Add one in between value to fill a gap in the scale and the system is gone, because every page then starts inventing measurements of its own.
Further study
USWDSのdesign tokensのページ(段の刻み方そのものが書いてある) / Public Sansと元になったLibre Franklinを並べ、字形をどこで整理したか見る / 実際の連邦サイトを数枚開き、余白と文字寸法が本当に段の上に載っているか測る

Related entries

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