Guide · 8 min · Updated 20/05/2026
Mobile SEO 2026: mobile-first index, Core Web Vitals, design patterns
Mobile-first indexing means mobile content IS the index. Desktop versions are now reference material.
Hidden content still counts
Content hidden behind tabs / accordions on mobile is fully indexed. The 'hidden content carries less weight' rule from 2015 no longer applies — but make it accessible.
Tap-target sizing matters
48 × 48 px minimum tap target with 8 px spacing. Failing this hurts mobile usability score in Lighthouse and indirectly hurts ranking via page-experience signal.
Common questions
Does AMP still matter?
No. Google removed AMP requirement for Top Stories in 2021. AMP is now legacy.