Build zero-asset CSS border triangles, popover carets, and dropdown arrows in all 8 directions.
Execution runs 100% locally inside the browser sandbox using HTML5 Canvas, Web Cryptography Subtle API, and Web Workers. Zero egress.
Zero network latency. Operates completely offline with zero dependencies on third-party backend servers or cloud services.
Built according to official RFC specifications, cryptographic test vectors, and enterprise-grade data transformation standards.
Choose pointing direction (top, bottom, left, right, or diagonal).
Set triangle width, height, and fill color.
Copy the border-width and border-color stylesheet rules.
By setting width: 0 and height: 0, thick solid borders create angled miter joints where transparent borders carve out sharp triangles.
No, they render purely using standard CSS box model borders.
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