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A vibrant, stylized HTML tag glowing with digital energy, surrounded by floating code snippets and checkmarks, on a dark background.

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Testing HTML

Manual Testing Methods

Browser Developer Tools

• Inspect Element: Right-click any element and select "Inspect"


• Console: Check for JavaScript errors


• Elements Panel: Verify HTML structure and attributes


• Network Tab: Monitor resource loading

Basic Validation


``bash


Using W3C validator


curl -H "Content-Type: text/html; charset=utf-8" \
--data-binary @yourfile.html \
https://validator.w3.org/nu/?out=json
`

Visual Testing



• Open HTML file directly in browser


• Test across different browsers (Chrome, Firefox, Safari, Edge)


• Check responsive design at different screen sizes

Automated Testing

HTML Validation Tools


`javascript
// Using html-validator package
const { html5 } = require('html-validator');

const result = await html5({
data: '...',
format: 'json'
});
`

Unit Testing Frameworks


`javascript
// Using Jest with jsdom
const { JSDOM } = require('jsdom');

test('HTML contains correct elements', () => {
const dom = new JSDOM(...);
expect(dom.window.document.querySelector('h1')).toBeTruthy();
});
`

End-to-End Testing


`javascript
// Using Playwright
const { test, expect } = require('@playwright/test');

test('page loads correctly', async ({ page }) => {
await page.goto('file:///path/to/your/file.html');
await expect(page.locator('h1')).toContainText('Expected Title');
});
`

Common HTML Tests

Structure Validation



• Check DOCTYPE declaration


• Validate HTML syntax


• Verify proper nesting of elements


• Ensure required attributes are present

Accessibility Testing



• Use screen readers


• Check keyboard navigation


• Validate ARIA attributes


• Test color contrast

Performance Testing



• Monitor page load times


• Check resource sizes


• Validate caching headers


• Test with slow network conditions

Tools and Resources

Online Validators



• W3C Markup Validation Service


• HTMLHint


• Lighthouse (Chrome DevTools)

Local Tools



• HTML Tidy


• ESLint with HTML plugins


• Browser developer tools


• Local server for testing (e.g., python -m http.server`)

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The prompt for this was: how can i test html

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