Miguel Ángel
701ae9e9b9
The WCAG contrast audit estimated each text element's background by sampling a 4px pixel ring just OUTSIDE its bounding box. For an element that paints its OWN opaque background (a caption pill, a CTA button, a solid card), the text is composited over that solid color, not over whatever surrounds the box. Sampling the ring there measured the text against the scene behind the element (often a dark photo), producing false ~1:1 ratios and flagging perfectly readable CTAs and captions. Users reported the warning persisting no matter how they changed the background color, because the audit was never reading it. Resolve the nearest fully-opaque background-color by walking the element up its ancestor chain, and use it when present; keep sampling the ring only when the text sits over image pixels (a background-image is hit first) or no opaque background exists. The pure decision lives in a new commands/contrast-bg.ts with unit tests; contrast-audit.browser.js (injected as a raw string, so it cannot import) inlines the same logic, mirroring the existing duplicated-WCAG-math note.
hyperframes
CLI for creating, previewing, and rendering HTML video compositions.
Install
npm install -g hyperframes
Or use directly with npx:
npx hyperframes <command>
Requirements: Node.js >= 22, FFmpeg
Commands
init
Scaffold a new Hyperframes project from a template:
npx hyperframes init my-video
cd my-video
preview
Start the live preview studio in your browser:
npx hyperframes preview
# Studio running at http://localhost:3002
npx hyperframes preview --port 4567
render
Render a composition to MP4. Run from the project directory; the positional
argument is the project directory (not a file), so render the project's
index.html directly, or point at a specific composition file with -c:
npx hyperframes render -o output.mp4
npx hyperframes render -c ./my-composition.html -o output.mp4
lint
Validate your Hyperframes HTML:
npx hyperframes lint ./my-composition
npx hyperframes lint ./my-composition --json # JSON output for CI/tooling
npx hyperframes lint ./my-composition --verbose # Include info-level findings
By default only errors and warnings are shown. Use --verbose to also display informational findings (e.g., external script dependency notices). Use --json for machine-readable output with errorCount, warningCount, infoCount, and a findings array.
compositions
List compositions found in the current project:
npx hyperframes compositions
benchmark
Run rendering benchmarks:
npx hyperframes benchmark ./my-composition.html
doctor
Check your environment for required dependencies (Chrome, FFmpeg, Node.js):
npx hyperframes doctor
browser
Manage the bundled Chrome/Chromium installation:
npx hyperframes browser
info
Print version and environment info:
npx hyperframes info
docs
Open the documentation in your browser:
npx hyperframes docs
upgrade
Check for updates and show upgrade instructions:
npx hyperframes upgrade
npx hyperframes upgrade --check --json # machine-readable for agents
Documentation
Full documentation: hyperframes.heygen.com/packages/cli
Related packages
@hyperframes/core— types, parsers, frame adapters@hyperframes/engine— rendering engine@hyperframes/producer— render pipeline@hyperframes/studio— composition editor UI