January 3, 2026 12:32 pm Posted by: dimi

Understanding W3 Validator Changes: Heading Order Matters!

Recently, there’s been an update to the W3 Validator regarding heading order in HTML. It’s crucial to follow a proper hierarchy when using heading tags (H1, H2, H3, H4, H5, H6). The correct order is absolute, meaning headings must always follow a logical progression: H1 → H2 → H3 → H4 → H5 → H6.

For example, if you place an H5 tag immediately after an H2, skipping over H3 and H4, the W3 Validator will flag this as an error. This can cause issues with SEO, accessibility, and overall document structure.

Make sure you’re organizing your headings correctly to keep your HTML valid and your website optimized!