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canon-density

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更新日2026年4月18日 06:53

Use when designing or implementing density modes (compact, default, comfortable), adjusting spacing without changing font sizes, supporting power users who need denser UIs, or adapting layouts for data-heavy vs content-heavy contexts. Trigger when the user mentions density, compact mode, comfortable spacing, or information density.

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CANON · Density

Density is spacing, not font size. Changing density means scaling gaps, padding, and row heights while keeping type legible.

Three density modes

Mode	Use	Spacing multiplier
Compact	Power users, data tables, dashboards, admin tools	0.75×
Default	Most apps	1×
Comfortable	Content-heavy, reading-focused, onboarding	1.25×

What scales

Property	Compact	Default	Comfortable
Row height	32px	48px	56px
Card padding	12px	16px	24px
Button height	32px	40px	48px
Input height	32px	40px	48px
Gap between items	8px	16px	24px
Section spacing	24px	40px	56px

What does NOT scale

Font sizes. 14px body stays 14px across all densities. Compact reads the same text; it just packs it tighter.
Touch targets on mobile. 44px floor stays, regardless of density mode. Density modes are desktop-only unless you're building for stylus input.
Icon sizes. Icons stay at their grid-aligned size (16, 20, 24px).
Border radius. Stays consistent.
Line height. Governed by type size, not density.

Implementation — CSS custom properties

:root {
  --density: 1;
  --space-unit: calc(8px * var(--density));
}
[data-density="compact"]  { --density: 0.75; }
[data-density="comfortable"] { --density: 1.25; }

.card { padding: calc(var(--space-unit) * 2); }
.row { min-height: calc(var(--space-unit) * 6); }

Or use discrete scales where continuous math creates half-pixel values.

User control

Toggle in settings or toolbar.
Persist in localStorage.
Per-view override OK (table might be compact while the page is default).
Default is "default." Don't auto-compact on small screens — that's responsive design, not density.

Anti-patterns

Anti-pattern	Why it fails
Shrinking font size for compact	Illegibility; density is spacing, not type
Compact mode on mobile with touch targets < 44px	WCAG 2.5.5 violation
Comfortable mode that doubles spacing everywhere	Wastes real estate, looks broken
No user toggle	Forces one density on everyone
Mixing density modes within a single component	Visual incoherence

Audit checklist

Three modes defined (compact, default, comfortable)
Font sizes unchanged across modes
Touch targets ≥ 44px on mobile regardless of density
Spacing uses design tokens or CSS calc with density variable
User can toggle and choice persists
Default mode is the default

Sources

Material Design 3 · Layout: applying density
Atlassian Design System · Spacing and density
Apple HIG · "Adaptivity and Layout"

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name	canon-density
description	Use when designing or implementing density modes (compact, default, comfortable), adjusting spacing without changing font sizes, supporting power users who need denser UIs, or adapting layouts for data-heavy vs content-heavy contexts. Trigger when the user mentions density, compact mode, comfortable spacing, or information density.

CANON · Density

Density is spacing, not font size. Changing density means scaling gaps, padding, and row heights while keeping type legible.

Three density modes

Mode	Use	Spacing multiplier
Compact	Power users, data tables, dashboards, admin tools	0.75×
Default	Most apps	1×
Comfortable	Content-heavy, reading-focused, onboarding	1.25×

What scales

Property	Compact	Default	Comfortable
Row height	32px	48px	56px
Card padding	12px	16px	24px
Button height	32px	40px	48px
Input height	32px	40px	48px
Gap between items	8px	16px	24px
Section spacing	24px	40px	56px

What does NOT scale

Font sizes. 14px body stays 14px across all densities. Compact reads the same text; it just packs it tighter.
Touch targets on mobile. 44px floor stays, regardless of density mode. Density modes are desktop-only unless you're building for stylus input.
Icon sizes. Icons stay at their grid-aligned size (16, 20, 24px).
Border radius. Stays consistent.
Line height. Governed by type size, not density.

Implementation — CSS custom properties

:root {
  --density: 1;
  --space-unit: calc(8px * var(--density));
}
[data-density="compact"]  { --density: 0.75; }
[data-density="comfortable"] { --density: 1.25; }

.card { padding: calc(var(--space-unit) * 2); }
.row { min-height: calc(var(--space-unit) * 6); }

Or use discrete scales where continuous math creates half-pixel values.

User control

Toggle in settings or toolbar.
Persist in localStorage.
Per-view override OK (table might be compact while the page is default).
Default is "default." Don't auto-compact on small screens — that's responsive design, not density.

Anti-patterns

Anti-pattern	Why it fails
Shrinking font size for compact	Illegibility; density is spacing, not type
Compact mode on mobile with touch targets < 44px	WCAG 2.5.5 violation
Comfortable mode that doubles spacing everywhere	Wastes real estate, looks broken
No user toggle	Forces one density on everyone
Mixing density modes within a single component	Visual incoherence

Audit checklist

Three modes defined (compact, default, comfortable)
Font sizes unchanged across modes
Touch targets ≥ 44px on mobile regardless of density
Spacing uses design tokens or CSS calc with density variable
User can toggle and choice persists
Default mode is the default

Sources

Material Design 3 · Layout: applying density
Atlassian Design System · Spacing and density
Apple HIG · "Adaptivity and Layout"