How to fix heading order on Squarespace

Steps for Squarespace

1. Open the Pages panel and click 'Edit' on the page you want to fix.
2. Click any text block that contains a heading. In the rich-text toolbar, use the text-style dropdown (showing 'Heading 1', 'Heading 2', 'Heading 3') to assign the correct heading level — Squarespace maps these directly to H1, H2, and H3 HTML tags.
3. For blocks where the heading level is hard-coded by the template (e.g., section titles in certain blocks), go to Website → Pages → click the gear icon next to the page → Advanced, and add custom CSS to reassign visual styling without changing your heading markup (or use a Code Block to insert a manually tagged heading).
4. If you need heading levels beyond H3, insert a Code Block and write the HTML heading tag directly: e.g., <h4>Sub-section title</h4>.
5. After saving, use the axe DevTools or HeadingsMap browser extension to verify the heading outline.

What is heading order?

HTML headings (H1 through H6) are not just visual styling — they form an invisible outline of your page that screen readers and search engines read to understand your content structure. "Heading order invalid" means your page skips heading levels (for example, jumping from an H1 straight to an H4, or using an H3 before an H2), or uses headings out of sequence. Think of headings like the chapters and sub-chapters of a book: if you skip from Chapter 1 straight to Sub-sub-section 4, the reader loses the thread. The fix is to ensure every heading on every page flows in a strict, unbroken hierarchy: one H1 (the page title), then H2s for major sections, then H3s for sub-sections within those, and so on — never skipping a level on the way down.

Screen reader users — people who are blind or have low vision — navigate pages almost exclusively by jumping between headings. A broken heading order disorients them, makes your store harder or impossible to use, and can expose you to accessibility lawsuits under the ADA (USA), AODA (Canada), EAA (EU), and similar laws that are increasingly enforced against ecommerce businesses. Search engines like Google also use heading structure to understand what a page is about and which content matters most; a well-structured heading hierarchy reinforces your keyword relevance signals and can improve organic rankings. Finally, fixing heading order removes a WCAG 2.1 Level AA failure (Success Criterion 1.3.1, "Info and Relationships"), which is the baseline standard most accessibility audits and legal compliance frameworks reference.

See the complete Heading order guide for every platform and the full background.