Revealing Text With CSS letter-spacing

CSS-Tricks published a tutorial exploring how to build text-reveal animations using letter-spacing with negative values, color: transparent, and CSS transitions. The techniques chain together a few well-supported CSS features to create effects that would otherwise require JavaScript or a per-character pseudo-element selector that doesn’t exist yet.

What’s actually new

This isn’t a new browser feature — it’s a creative application of existing ones. The core trick: set letter-spacing: -1ch (or -2ch) to collapse all characters on top of each other, then hide them with color: transparent. On a state change (:checked, :hover), transition letter-spacing back to 0ch and flip color to black. The article walks through three variations: a simple checkbox-triggered reveal with different text-align positions controlling the reveal direction; a toggle that swaps between two <span> texts inside a label using staggered transitions and overflow: clip; and an acronym pattern where ::first-letter stays visible (via color: black) while the rest of each word remains collapsed and transparent until hover. The cubic-bezier timing function (.8, -.5, .2, 1.4) gives the spacing animation an overshoot/“bouncy” feel. The article also notes the long-requested ::nth-letter() pseudo-element would make individual character targeting far easier, but that doesn’t exist in any spec today.

What it means for your config

There’s nothing here that touches build tooling, PostCSS plugins, or CSS config files. The properties used — letter-spacing, color, transition, overflow: clip, ::first-letter — are standard CSS with broad browser support and don’t require vendor prefixes or feature flags in modern targets. If you’re running Autoprefixer or a Browserslist config, none of these properties should trigger prefix insertion for current baselines. One thing worth noting for linting setups: if you use Stylelint with strict rules around cubic-bezier values or negative length values, the patterns here (negative letter-spacing, negative values inside cubic-bezier) are perfectly valid CSS but might trip overly aggressive custom rules. No migration or config change is needed.

Recommended next step

If you’re building interactive UI touches — onboarding flows, toggle states, hover reveals — these patterns are worth bookmarking as a no-JS option. The checkbox-plus-label approach is the most practical for production since it doesn’t rely on hover (important for touch devices). Before shipping, test with screen readers: collapsing characters visually doesn’t affect the DOM text, but color: transparent combined with overflow: clip may need aria-live or visually-hidden fallback text to communicate state changes. Read the full tutorial for the complete code and embedded demos.

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Read the full announcement on CSS-Tricks → Revealing Text With CSS letter-spacing