Web Typography Skill

A definitive guide for producing excellent typography on the web, distilled from Robert Bringhurst's The Elements of Typographic Style as applied to the web by Richard Rutter, and supplemented with modern CSS best practices.

When to consult this skill: Any time you write or review CSS/HTML that involves readable text — body copy, articles, documentation, blogs, email, or prose-heavy UI.

---

1. Horizontal Rhythm — Word & Letter Spacing

1.1 Word Spacing

The ideal word space is approximately 0.25 em, but varies by typeface. Loosely fitted or bold faces need wider word spaces; tighter faces need narrower ones.

/* Increase word spacing for a loose face */
p.loose-face {
  word-spacing: 0.05em;
}

/* Tighten word spacing for a display heading */
h1 {
  word-spacing: -0.02em;
}

Always specify word-spacing in em so it scales proportionally with font size.

1.2 Single Word Space Between Sentences

Use exactly one space between sentences — never two. HTML collapses all whitespace to a single space automatically, so this is handled by default. Never insert    or extra spacing between sentences.

1.3 Strings of Initials

Add little or no extra space within strings of initials (e.g., J.F.K., U.S.A.). The periods provide sufficient separation. Use a normal word space after the final period.

1.4 Letterspace All-Caps and Small Caps

Strings of capital letters and small caps must always be letterspaced. Without it, capitals crowd together and become harder to read.

/* Abbreviations and acronyms in small caps */
abbr,
.small-caps {
  font-variant-caps: all-small-caps;
  letter-spacing: 0.05em; /* 5–10% of type size */
}

/* Any text in all-caps */
.all-caps,
.uppercase {
  text-transform: uppercase;
  letter-spacing: 0.06em;
}

The recommended range is 5–10% of type size (0.05em–0.1em). Always use em units.

1.5 Don't Letterspace Lowercase

Lowercase letters are designed to fit together without tracking adjustments. Never letterspace body text. The only exceptions are very bold condensed faces used at large display sizes, where a small amount (0.01em–0.02em) may improve legibility.

1.6 Kerning

Enable font kerning and let the typeface designer's kerning tables do their work. Don't override kerning without a specific reason.

body {
  font-kerning: auto;
  /* Or explicitly: */
  font-feature-settings: "kern" 1;
}

Kern consistently and modestly — or not at all.

1.7 Don't Alter Letter Widths or Shapes

Never use transform: scaleX() or font-stretch to artificially compress or expand letterforms. If you need a condensed or extended face, choose a typeface that was designed that way.

1.8 Don't Stretch the Space Until It Breaks

Avoid justified text on the web unless you also enable hyphenation. Without hyphenation, justified text produces "rivers" of white space — ugly, uneven gaps between words.

---

2. Measure (Line Length)

This is one of the most impactful typographic decisions you will make.

The Rule

Context	Characters per line	CSS approximation
Single column prose	45–75 (ideal: 66)	max-width: 33em or max-width: 66ch
Multi-column text	40–50	max-width: 25em
Short companion text	30–40	max-width: 20em

Implementation

/* Best: use ch unit (width of the "0" glyph) */
article,
.prose {
  max-width: 66ch;
}

/* Good alternative: em-based (1 char ≈ 0.5em) */
.content {
  max-width: 33em;
}

Why ch or em over px? Elastic widths ensure the measure remains stable when readers change their text size. A px-based width changes the character count when text is resized; em and ch do not.

Never let body text run to the full viewport width. Lines exceeding 80 characters are uncomfortable to read because the eye struggles to track back to the next line start.

Responsive Considerations

On small screens, the screen width naturally constrains measure. Don't reduce font size just to preserve an "ideal" measure — prioritise readable font size (minimum 16px) and accept a shorter measure on mobile (even down to 25–35 characters is fine for handheld devices). Adjust line-height to compensate (see §3).

---

3. Vertical Rhythm — Leading (Line Height)

3.1 Choose a Basic Leading

/* Good defaults for body text */
body {
  line-height: 1.4;  /* Minimum for comfortable reading */
}

/* Common comfortable range */
.prose {
  line-height: 1.5;  /* This page-like feel works well for most text */
}

General guidance:

Situation	line-height
Body text, long-form reading	1.4–1.6
Short text, UI labels	1.2–1.4
Large headings	1.0–1.2
Small / caption text	1.5–1.8

Key relationships:

• Longer lines (wider measure) need more line-height.
• Shorter lines need less line-height.
• Larger text needs less line-height.
• Smaller text needs more line-height.
• Light or reversed text (white on black) needs more line-height.

Always use a unitless multiplier (e.g., 1.5, not 1.5em or 24px) so line-height scales correctly with font-size changes.

3.2 Add and Delete Vertical Space in Measured Intervals

Maintain vertical rhythm by keeping all vertical spacing as multiples of the base line-height. Headings, blockquotes, images, and other intrusions into the text should return the text to its baseline rhythm.

:root {
  --base-size: 1rem;      /* 16px default */
  --base-lh: 1.5;         /* line-height multiplier */
  --rhythm: calc(var(--base-size) * var(--base-lh)); /* 24px */
}

p {
  font-size: var(--base-size);
  line-height: var(--base-lh);
  margin-top: 0;
  margin-bottom: var(--rhythm);
}

h2 {
  font-size: 1.5rem;
  line-height: 1.3;
  /* Margins should combine to a multiple of the base rhythm */
  margin-top: calc(var(--rhythm) * 2);    /* 2 lines above */
  margin-bottom: var(--rhythm);           /* 1 line below */
}

blockquote {
  margin-top: var(--rhythm);
  margin-bottom: var(--rhythm);
  padding-left: 1.5em;
}

When text size changes (headings, sidenotes), adjust line-height so each element occupies a whole multiple of the base rhythm unit.

---

4. Blocks & Paragraphs

4.1 Opening Paragraphs: Flush Left

The first paragraph of any section — after a heading, after the start of the document — should be set flush left with no indent. An indent signals continuation; there is nothing to continue from at the very beginning.

4.2 Subsequent Paragraphs: Indent or Space — Not Both

Choose ONE method to separate paragraphs:

Option A — Indentation (traditional/print feel):

p {
  margin: 0;
}

p + p {
  text-indent: 1.5em; /* At least 1em; often matches line-height */
}

/* Never indent after headings */
h1 + p,
h2 + p,
h3 + p,
h4 + p,
h5 + p,
h6 + p {
  text-indent: 0;
}

Option B — Block paragraphs with vertical space (common web convention):

p {
  margin-top: 0;
  margin-bottom: 1.5em; /* Equal to line-height for rhythm */
}

Using both an indent AND vertical space is redundant and creates awkward gaps.

4.3 Block Quotations

Add extra vertical space (equal to the line-height) before and after block quotations. Indent from the left, and optionally from the right. Do NOT reduce the font size of block quotes unless they are genuinely secondary (like footnotes).

blockquote {
  margin: 1.5em 0;      /* Vertical space matches rhythm */
  padding-left: 1.5em;  /* Indent from left */
  padding-right: 1.5em;
  border-left: 3px solid currentColor;
  opacity: 0.85;
}

4.4 Verse and Poetry

Centre verse quotations on the longest line, or indent them. Set flush left with ragged right. Never justify poetry.

---

5. Alignment & Justification

Default: Flush Left (Ragged Right)

For virtually all web text, use text-align: left. This is the most readable alignment because word spacing remains consistent and readers can easily find the start of each line.

body {
  text-align: left;
}

Justified Text — Only With Hyphenation

If you must justify, enable CSS hyphenation to prevent rivers of whitespace:

.justified {
  text-align: justify;
  hyphens: auto;
  -webkit-hyphens: auto;
  hyphenate-limit-chars: 6 3 2; /* min word length, chars before break, chars after */
  hyphenate-limit-lines: 3;     /* Max consecutive hyphenated lines */
  hyphenate-limit-zone: 8%;
}

/* Never justify the last line */
.justified {
  text-align-last: left;
}

Important hyphenation rules:

• Leave at least 2 characters before the break and 3 characters after.
• Never allow more than 3 consecutive hyphenated lines.
• Set the lang attribute on your <html> element — browsers need it for correct hyphenation dictionaries.

Non-Breaking Spaces

Use   to prevent breaks within short numerical and mathematical expressions:

<!-- Good: keeps number and unit together -->
<p>The sample weighed 3.5&nbsp;kg and measured 10&nbsp;cm.</p>

<!-- Good: keeps date components together -->
<p>On 1&nbsp;January&nbsp;2026, the policy takes effect.</p>

---

6. Type Scale — Don't Compose Without a Scale

Use a modular scale to create harmonious size relationships. The traditional typographic scale (developed over 400 years) provides time-tested intervals.

Classic Modular Scales

Scale name	Ratio	Sequence (base 16px)
Minor Third	1.2	16, 19.2, 23, 27.6, 33.2
Major Third	1.25	16, 20, 25, 31.3, 39
Perfect Fourth	1.333	16, 21.3, 28.4, 37.9, 50.5
Augmented Fourth	1.414	16, 22.6, 32, 45.3
Perfect Fifth	1.5	16, 24, 36, 54
Golden Ratio	1.618	16, 25.9, 41.9, 67.8

Implementation with CSS Custom Properties

:root {
  --scale-ratio: 1.25;    /* Major Third */
  --base-size: 1rem;       /* 16px */

  --size-sm:  calc(var(--base-size) / var(--scale-ratio));         /* 0.8rem / ~13px */
  --size-base: var(--base-size);                                    /* 1rem / 16px */
  --size-md:  calc(var(--base-size) * var(--scale-ratio));          /* 1.25rem / 20px */
  --size-lg:  calc(var(--base-size) * var(--scale-ratio) * var(--scale-ratio));  /* 1.563rem / 25px */
  --size-xl:  calc(var(--base-size) * var(--scale-ratio) * var(--scale-ratio) * var(--scale-ratio));  /* 1.953rem / ~31px */
  --size-2xl: calc(var(--base-size) * var(--scale-ratio) * var(--scale-ratio) * var(--scale-ratio) * var(--scale-ratio)); /* 2.441rem / ~39px */
}

body  { font-size: var(--size-base); }
small, .caption { font-size: var(--size-sm); }
h4    { font-size: var(--size-md); }
h3    { font-size: var(--size-lg); }
h2    { font-size: var(--size-xl); }
h1    { font-size: var(--size-2xl); }

Body Text Minimum Size

• Desktop: 16px minimum (1rem). 18px–20px is increasingly common and improves readability.
• Mobile: 16px minimum. Never go below 14px. Larger is almost always better.

Use rem for font sizes to respect user preferences. Set a percentage on the body to establish the base:

body {
  font-size: 100%; /* Respects user's browser setting, typically 16px */
}

---

7. Numerals, Capitals & Small Caps

7.1 Old-Style (Text) vs. Lining (Titling) Figures

Context	Figure style	CSS
Running body text	Old-style	font-variant-numeric: oldstyle-nums
Headings in ALL CAPS / Title Case	Lining	font-variant-numeric: lining-nums
Tables and data	Tabular lining	font-variant-numeric: lining-nums tabular-nums

/* Body text: old-style figures blend with lowercase */
.prose {
  font-variant-numeric: oldstyle-nums proportional-nums;
}

/* Tables: tabular lining figures for vertical alignment */
table {
  font-variant-numeric: lining-nums tabular-nums;
}

/* Headings in caps: lining figures to match */
h1, h2, h3 {
  font-variant-numeric: lining-nums;
}

Note: Many system and web fonts only ship lining figures. If old-style figures are important to your design, choose a typeface that includes them (e.g., Georgia, Palatino, EB Garamond, Source Serif Pro, Literata).

7.2 Abbreviations and Acronyms in Small Caps

In running text, abbreviations like NASA, HTML, CSS should ideally be set in spaced small caps so they don't shout amid lowercase text.

abbr[title] {
  font-variant-caps: all-small-caps;
  letter-spacing: 0.05em;
  text-decoration: none;      /* Remove default underline */
}

True small caps vs. fake small caps: font-variant-caps: all-small-caps will use genuine small cap glyphs if the font includes them. Never simulate small caps by scaling down capitals — the stroke weight will be too thin.

---

8. Typographic Details Checklist

Apply these micro-typographic refinements in every project:

Punctuation & Symbols

Instead of…	Use…	HTML entity / character
Straight quotes " '	Curly quotes " " ' '	“ ” ‘ ’
Hyphen for ranges -	En dash –	–
Double hyphen --	Em dash —	—
Three dots ...	Ellipsis …	…
x for multiply	Multiplication sign ×	×
(c) for copyright	©	©

Hanging Punctuation (Progressive Enhancement)

.prose {
  hanging-punctuation: first allow-end;
}

This optically aligns the left edge of text by letting punctuation (quotes, hyphens) hang into the margin. Browser support is limited to Safari as of 2025, but it is a safe progressive enhancement.

Font Smoothing

body {
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  text-rendering: optimizeLegibility;
}

optimizeLegibility enables kerning and ligatures in browsers that support it, but can cause performance issues with very large amounts of text. Use optimizeSpeed for long documents if rendering performance is a concern.

Ligatures

body {
  font-variant-ligatures: common-ligatures;
  /* Enables fi, fl, ff, ffi, ffl ligatures when available */
}

Widows and Orphans

CSS has widows and orphans properties for paged media (print stylesheets). For screen, the newer text-wrap: pretty provides some control:

.prose {
  text-wrap: pretty; /* Avoids single-word last lines where possible */
}

h1, h2, h3 {
  text-wrap: balance; /* Balances line lengths in multi-line headings */
}

---

9. Complete Starter Stylesheet

Here is a production-ready base typography stylesheet applying all the principles above:

/* ==========================================================================
   Base Typography — Applying The Elements of Typographic Style to the Web
   ========================================================================== */

:root {
  /* Scale: Major Third (1.25) */
  --ratio: 1.25;
  --base: 1rem;

  /* Type scale */
  --size-sm:   0.8rem;
  --size-base: 1rem;
  --size-md:   1.25rem;
  --size-lg:   1.563rem;
  --size-xl:   1.953rem;
  --size-2xl:  2.441rem;
  --size-3xl:  3.052rem;

  /* Vertical rhythm */
  --lh: 1.5;
  --rhythm: calc(var(--base) * var(--lh));

  /* Measure */
  --measure: 66ch;
  --measure-narrow: 45ch;
  --measure-wide: 80ch;
}

/* --- Reset & Base -------------------------------------------------------- */

*,
*::before,
*::after {
  box-sizing: border-box;
}

html {
  font-size: 100%;                         /* Respect user preference */
  -webkit-text-size-adjust: 100%;
}

body {
  font-family: "Source Serif 4", Georgia, "Times New Roman", serif;
  font-size: var(--size-base);
  line-height: var(--lh);
  font-kerning: auto;
  font-variant-ligatures: common-ligatures;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  color: #1a1a1a;
  background-color: #fafaf8;
}

/* --- Measure ------------------------------------------------------------- */

article,
.prose,
main > *:not(.full-width) {
  max-width: var(--measure);
}

/* --- Paragraphs ---------------------------------------------------------- */

p {
  margin-top: 0;
  margin-bottom: var(--rhythm);
  hanging-punctuation: first allow-end;
  text-wrap: pretty;
}

/* --- Headings ------------------------------------------------------------ */

h1, h2, h3, h4, h5, h6 {
  font-variant-numeric: lining-nums;
  text-wrap: balance;
  margin-top: calc(var(--rhythm) * 2);
  margin-bottom: var(--rhythm);
}

h1 {
  font-size: var(--size-3xl);
  line-height: 1.1;
  margin-top: 0;
}

h2 {
  font-size: var(--size-2xl);
  line-height: 1.2;
}

h3 {
  font-size: var(--size-xl);
  line-height: 1.25;
}

h4 {
  font-size: var(--size-lg);
  line-height: 1.3;
}

/* First paragraph after heading: no indent, no extra space */
h1 + p,
h2 + p,
h3 + p,
h4 + p,
h5 + p,
h6 + p {
  margin-top: 0;
}

/* --- Blockquotes --------------------------------------------------------- */

blockquote {
  margin: var(--rhythm) 0;
  padding-left: 1.5em;
  border-left: 3px solid currentColor;
  font-style: italic;
}

blockquote > p:last-child {
  margin-bottom: 0;
}

/* --- Lists --------------------------------------------------------------- */

ul, ol {
  margin-top: 0;
  margin-bottom: var(--rhythm);
  padding-left: 1.5em;
}

li {
  margin-bottom: calc(var(--rhythm) * 0.25);
}

/* --- Inline elements ----------------------------------------------------- */

abbr[title] {
  font-variant-caps: all-small-caps;
  letter-spacing: 0.05em;
  text-decoration: none;
  cursor: help;
}

.uppercase,
.all-caps {
  text-transform: uppercase;
  letter-spacing: 0.06em;
}

strong {
  font-weight: 600;
}

/* --- Numerals ------------------------------------------------------------ */

.prose {
  font-variant-numeric: oldstyle-nums proportional-nums;
}

table {
  font-variant-numeric: lining-nums tabular-nums;
}

/* --- Small / Caption text ------------------------------------------------ */

small,
.caption,
figcaption {
  font-size: var(--size-sm);
  line-height: 1.6;       /* Smaller text needs more leading */
}

/* --- Code ---------------------------------------------------------------- */

pre, code {
  font-size: 0.875em;
  line-height: 1.6;
}

/* --- Horizontal rule (section break) ------------------------------------- */

hr {
  border: none;
  border-top: 1px solid currentColor;
  opacity: 0.2;
  margin: calc(var(--rhythm) * 2) 0;
}

/* --- Links --------------------------------------------------------------- */

a {
  color: inherit;
  text-decoration-color: currentColor;
  text-decoration-thickness: 1px;
  text-underline-offset: 0.15em;
}

a:hover {
  text-decoration-thickness: 2px;
}

/* --- Print --------------------------------------------------------------- */

@media print {
  body {
    font-size: 12pt;
    line-height: 1.4;
    color: #000;
    background: #fff;
  }

  p {
    widows: 3;
    orphans: 3;
  }

  h1, h2, h3 {
    page-break-after: avoid;
  }
}

---

10. Quick-Reference Decision Guide

When producing any web typography, run through this checklist:

1. Measure set? Body text constrained to 45–75 characters (max-width: 66ch).
2. Font size readable? Minimum 16px / 1rem for body text.
3. Line-height comfortable? 1.4–1.6 for body; tighter for headings; looser for small text.
4. Vertical rhythm maintained? All margins and padding are multiples of base line-height.
5. Type scale consistent? Sizes drawn from a modular scale, not arbitrary values.
6. Alignment appropriate? Left-aligned by default; justified only with hyphens: auto.
7. Caps letterspaced? All-caps and small-caps text has letter-spacing: 0.05em+.
8. Lowercase NOT letterspaced? letter-spacing is 0 (default) for body text.
9. Proper punctuation? Curly quotes, en/em dashes, real ellipses, × for multiplication.
10. Figures appropriate? Old-style in prose, lining in headings, tabular lining in tables.
11. lang attribute set? <html lang="en"> — needed for correct hyphenation.
12. Kerning enabled? font-kerning: auto on body.
13. Responsive? Sizes in rem/em, measure in ch/em, unitless line-height.
14. Headings balanced? text-wrap: balance on headings, text-wrap: pretty on prose.
15. No rivers? If justified, hyphenation is enabled and measure is wide enough (40+ chars).

---

Attribution

This skill synthesises typographic principles from:

• The Elements of Typographic Style Applied to the Web by Richard Rutter (webtypography.net), based on Robert Bringhurst's The Elements of Typographic Style.
• The U.S. Web Design System (USWDS) typography guidelines.
• Modern CSS specifications (CSS Fonts Module Level 4, CSS Text Module Level 4).

The webtypography.net content is licensed CC BY-NC 4.0 by Richard Rutter.