CSS Mask Generator

Masks control element visibility from alpha/luminance. Use clip-path instead when a hard geometric cut is sufficient.

Mask preset

Reveal edge (%)

Circle size (%)

Diagonal angle

Preview

Opaque mask areas remain visible; transparent areas hide the element.

MASK

Generated CSS—

Production CSS handoff

Review the CSS you will actually ship

This panel stays locked until you review the generated output above. It checks output shape, feature dependencies, motion/fallback concerns and creates a copy-ready component handoff.

Waiting for generated CSS

Output shapeLocked

Declarations—

UTF-8 bytes—

Browser preflightGenerate first

Features detected

Production findings

Copy-ready handoff

Generated component handoff will appear here.

Browser support is checked against the browser running this page, not every browser you support. Treat this as a production preflight, then test the copied CSS in your real component, content, cascade and target browser matrix.

What this CSS result proves

Generated CSS should be judged by the real output, not just the controls.

What to review before production

Copy the output into the actual component, test its layout/content extremes, and review browser support, fallbacks and accessibility before production use.