HTML — Hello World
A minimal, valid HTML5 document — doctype, head, and a single heading — for testing HTML parsers, highlighters, and validators against the simplest well-formed page.
<!doctype html>
<html lang="en">
<head>
<meta charset="utf-8" />
<title>Hello, world!</title>
</head>
<body>
<h1>Hello, world!</h1>
<p>This is a minimal, valid HTML5 document.</p>
</body>
</html>
Specifications
- Language
- HTML
- Kind
- hello-world
- Lines
- 11
- Encoding
- UTF-8
- Line Endings
- LF
Testing contract
Expected to pass- Scenario
- Parse the document with an HTML5 parser or validator and inspect the resulting tree.
- Expected result
- It validates with no errors or warnings: one `<!doctype html>`, `lang="en"` on the root element, a `<meta charset="utf-8">` inside `<head>`, and exactly one `<h1>` and one `<p>` in `<body>`. No element relies on error recovery.
What is a .html file?
HTML (HyperText Markup Language) is the structural markup language of the web, using nested tags to define document content, semantics, and links. It is typically paired with CSS for presentation and JavaScript for behavior. It is the foundational format rendered by browsers.
How to use this file
Use an example HTML file to test parsers, DOM construction, sanitization of untrusted markup, and rendering or scraping pipelines.
How to use this file for testing
“HTML — Hello World” is a deterministic Novus Examples fixture for Syntax highlighting, Code parsing, Editor testing. Idiomatic hello-world programs and realistic snippets across sixteen languages, exercising comments, string escapes, interpolation, numeric literals, and language keywords — for testing syntax highlighters, editor themes, and tree-sitter grammars.
Documented properties for this file: HTML · UTF-8 · LF. Compare results against paired or grouped companions on this page when present (clean↔damaged, searchable↔scanned, or format twins) so scores stay reproducible across runs.
Download the file once, keep the path stable in CI or local scripts, and treat the spec table as the contract: dimensions, seeds, field lists, and roles are intentional. Corrupt or invalid samples are labelled as such — expect parsers to fail loudly rather than silently accept them.
This is a short, known-correct source file. Run it through your syntax highlighter, linter, formatter, tree-sitter grammar, or parser, and open it in the in-browser editor to tweak and re-download. Each snippet exercises comments, string escapes, literals, and language keywords.
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Generated by generation/code_samples.py. Free for any use, no attribution required — license.