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| Validation Item | Status | Notes |
|---|---|---|
| HTML5 Doctype & Language Tag | PASS | Uses and lang="en-gb" |
| Character Encoding | PASS | UTF-8 ensures ECM symbols (−Mᵃᵖᵖ, E = mc²) display correctly |
| CSS Consistency | PASS | ECM palette, fonts, spacing applied consistently |
| Accessibility (Alt Text, Contrast) | CHECK | Images need proper alt attributes; contrast adequate |