Web Sustainability Guidelines

The Web Sustainability Guidelines can help web teams create digital products and services that work better for all people and our shared planet. These guidelines were created by the World Wide Web Consortium's (W3C) Sustainable Web Interest Group.

After horizontal review, updated guidelines will be published as an official W3C Note in 2026.

Select a category, tag, or individual guideline below to learn more.

2.21 Regularly test and maintain compatibility

User Experience Design

3.1 Set goals based on performance and energy impact

Web Development

3.2 Remove unnecessary or redundant information

Web Development

3.3 Modularize bandwidth-heavy components

Web Development

3.4 Remove unnecessary code

Web Development

3.5 Avoid redundancy and duplication in code

Web Development

3.6 Give third parties the same priority as first parties during assessment

Web Development

3.7 Ensure code follows good semantic practices

Web Development

3.8 Defer the loading of non-critical resources

Web Development

3.9 Provide information to help understand the usefulness of a page

Web Development

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