readability-line-length

What problem does it solve?

It prevents body text from becoming too hard to read by correcting line length (measure), which otherwise makes reading slower when lines are too long and disruptive when lines are too short.

Core Features & Use Cases

• Sets an evidence-based line-length target: Uses the 45–75 character guideline (with ~60–66 as a common sweet spot) to maintain comfortable eye movement.
• Explains how to implement measure: Covers container width, font size, typeface character width, and practical CSS approaches (e.g., max-width with ch units).
• Guides responsive behavior: Addresses how line length breaks across mobile, tablet, and wide desktop, including when to cap max-width and when to adjust font sizing.
• Provides design-safe patterns: Includes worked examples for blog layouts, dashboards, email, and documentation while warning against common anti-patterns like full-width prose.

Quick Start

Use the readability-line-length skill to set a prose container to a measure of about 65 characters per line and ensure it stays within the 45–75 comfort range across your target breakpoints.