Webfont Integration - CSS & JavaScript

Modern typography for the creative industry

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Implementation Guide

Code Snippets & Setup

Step-by-step instructions for deploying LetterLab typefaces across production environments. Choose between our global CDN for rapid prototyping or self-hosted bundles for enterprise compliance.

CDN Integration

Insert the stylesheet link into your document head. Load 'Neue Interact' and 'Serif Grotesk' asynchronously to prevent render-blocking. Include the provided JavaScript fallback for legacy browser support.

<link rel="stylesheet" href="https://cdn.letterlab.io/v2/neue-interact/400-700.css">

Self-Hosting Setup

Extract the .woff2 and .ttf assets from your license pack. Use the @font-face rule below. Set font-display: swap to prevent FOIT. Configure CORS headers on your origin server to avoid cross-origin font blocking.

@font-face { font-family: 'LetterLab Sans'; src: url('/fonts/ll-sans-400.woff2') format('woff2'); font-weight: 400; font-display: swap; }

Optimization

Performance Tips

Reduce layout shift and improve Largest Contentful Paint metrics with these proven deployment strategies.

Preload Critical Weights

Inject preload tags for the 400 and 700 weights used in hero sections. Limit initial font loads to under 140KB to maintain sub-second render times on 4G connections. Use font subsetting to strip unused glyphs for non-Latin markets.

Font Display Swap

Always declare font-display: swap in your @font-face declarations. Pair this with content-visibility: auto on large text blocks to defer off-screen typography until network conditions improve. Monitor CLS scores using the Chrome DevTools Performance panel.

Reliability

Fallback Fonts & Stacks

Maintain visual consistency when network requests fail or user agents restrict third-party resources.

System Font Matching

Match LetterLab Sans with -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto. Match LetterLab Serif with Georgia, "Times New Roman", serif. Adjust letter-spacing by -0.02em to compensate for native metric differences across operating systems.

CSS Fallback Chains

Define complete fallback stacks in your root stylesheet. Use font-feature-settings: "liga" 1, "calt" 1 across all weights to preserve ligature rendering when the primary font fails to load. Test fallback behavior using offline mode in browser developer tools.