4.8 KiB
html-w3c-validator
CLI for validating HTML pages using validator.w3.org.
📜 About
html-w3c-validator is a CLI tool to validate HTML pages using validator.w3.org.
You might use a JavaScript framework or simply use HTML but you should always validate your production HTML and this validation should be part of your CI/CD pipeline (tests, linting, etc.).
Why is HTML page validation important?
Quote from https://validator.w3.org/docs/help.html#why-validate:
One of the important maxims of computer programming is: "Be conservative in what you produce; be liberal in what you accept."
Browsers follow the second half of this maxim by accepting Web pages and trying to display them even if they're not legal HTML. Usually this means that the browser will try to make educated guesses about what you probably meant. The problem is that different browsers (or even different versions of the same browser) will make different guesses about the same illegal construct; worse, if your HTML is really pathological, the browser could get hopelessly confused and produce a mangled mess, or even crash.
⚙️ Getting Started
You can combine html-w3c-validator with start-server-and-test to validate HTML pages of your project.
Prerequisites
Node.js >= 16.0.0
Installation (with start-server-and-test)
npm install --save-dev html-w3c-validator start-server-and-test
⚙️ Configuration
package.json
{
"scripts": {
// Command to start the server serving your HTML pages (e.g: using vercel/serve)
"start": "serve \"./build\"",
// Command to validate your HTML pages
"test:html-w3c-validator": "start-server-and-test \"start\" \"http://127.0.0.1:3000\" \"html-w3c-validator\"",
},
}
.html-w3c-validatorrc.json
{
"$schema": "./node_modules/html-w3c-validator/schema/schema.json",
// URLs to validate.
"urls": ["http://127.0.0.1:3000/", "http://127.0.0.1:3000/about"],
// Files to validate.
"files": ["./index.html", "./about.html"],
// Specify the severities of the validator messages to report. (default: ["warning", "error"])
"severities": ["info", "warning", "error"],
}
Usage
node --run test:html-w3c-validator
Example of output (in case of success):
✔ Validating http://127.0.0.1:3000/
✔ Validating http://127.0.0.1:3000/about
Success: HTML validation (W3C) passed! 🎉
See the ./example folder for practical usage.
Options
--current-working-directory <path> The current working directory (default: `process.cwd()`).
-V, --version Output the version number.
-h, --help Display help for command.
💡 Contributing
Anyone can help to improve the project, submit a Feature Request, a bug report or even correct a simple spelling mistake.
The steps to contribute can be found in the CONTRIBUTING.md file.