35 checks in Core Web Vitals & Performance. Automated Its subsection has a live automated checker in the engine.
| ID | Check | Passes when |
|---|---|---|
| 4.6.01 | Validate presence of correct viewport meta tag | <meta name="viewport" content="width=device-width, initial-scale=1"> |
| 4.6.02 | Validate mobile LCP < 2.5s | Pass |
| 4.6.03 | Validate mobile INP < 200ms | Responsive |
| 4.6.04 | Validate mobile CLS < 0.1 | Stable |
| 4.6.05 | Validate mobile FCP < 1.8s | Fast |
| 4.6.06 | Validate mobile TTFB < 300ms | Good |
| 4.6.07 | Validate responsive layout (no horizontal scroll) | Clean |
| 4.6.08 | Validate mobile-friendly font sizes (>16px) | Accessible |
| 4.6.09 | Validate legible line-height (>1.4) | Readable |
| 4.6.10 | Validate tap target size >= 48px | Compliant |
| 4.6.11 | Validate minimal tap overlap | No overlapping |
| 4.6.12 | Validate sticky headers do not obstruct content | Safe layout |
| 4.6.13 | Validate mobile navigation accessible | Easy interaction |
| 4.6.14 | Validate mobile menu animation smooth (<16ms frame time) | Smooth |
| 4.6.15 | Validate touch gesture support | Functional |
| 4.6.16 | Validate no JS blocking first input | Responsive |
| 4.6.17 | Validate mobile JS bundle smaller than desktop | Optimized |
| 4.6.18 | Validate mobile image variants served | Yes |
| 4.6.19 | Validate content compression on mobile | Enabled |
| 4.6.20 | Validate minimal mobile CPU throttling impact | Fast |
| 4.6.21 | Validate preload hints optimized for mobile | Correct |
| 4.6.22 | Detect heavy animations harming mobile battery | Minimized |
| 4.6.23 | Validate correct safe-area padding (iPhone notch support) | Present |
| 4.6.24 | Validate correct scaling on high DPI screens | Sharp |
| 4.6.25 | Validate dark mode supported on mobile where relevant | Yes |
| 4.6.26 | Validate mobile-specific CSS loaded efficiently | Lightweight |
| 4.6.27 | Validate form field usability on mobile | Compliant |
| 4.6.28 | Validate keyboard visibility not breaking layout | Stable |
| 4.6.29 | Validate input auto-zoom disabled where appropriate | UX correct |
| 4.6.30 | Validate CTA buttons visible above fold | UX optimized |
| 4.6.31 | Validate pinch-zoom works correctly (unless intentionally disabled) | Functional |
| 4.6.32 | Validate orientation changes do not break layout | Robust |
| 4.6.33 | Validate mobile network performance (3G/4G test) | Optimized |
| 4.6.34 | Validate AMP fallback (if AMP-supported site) | Working |
| 4.6.35 | Compute mobile performance composite score | >= 90% |
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