Is this valid HTML5?
Return true if the input is conforming HTML, otherwise false.
Input and output
Handle optional end tags, void elements, self-closing syntax, and invalid documents. The compliance suite combines known edge cases with generated documents and fuzzing.
- Input
- A complete UTF-8 HTML document
- Output
- ASCII true or false, without a newline
In preparation
The final specification and resource limits are being refined.
MCP access opens when the challenge is published.