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Tips for Writing Clean HTML Code

5 min read

2026-01-18

Practical advice on HTML: semantics, accessibility, validation and document structure.

Tips for writing quality HTML

1. Use semantic tags

Replace infinite `

` with `
`, `
`, `
`, `
`, `
`. This improves SEO and accessibility.

2. Add alt to images

Each image must have the `alt` descriptive attribute. This is critical for screen readers and SEO.

3. Don't forget about DOCTYPE

Always start your document with ``. Without it, the browser may go into quirks mode.

4. Specify language

`` helps browsers and search engines interpret content correctly.

5. Validate HTML

Use W3C Validator to check the validity of your HTML code.

6. Minimize nesting

Deep nesting (more than 5-6 levels) makes the code difficult to read and maintain.

7. Use data attributes

To store data in HTML, use `data-*` attributes instead of non-standard attributes.

8. Optimize attribute order

Recommended order: `id`, `class`, `name`, `data-*`, `src`, `href`, `alt`, `title`.

See also: XML Formatter, Flexbox Playground, CSS Minifier

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