Web performance seo

Skill ComeOnOliver/skillshub/skills/aiskillstore/marketplace/zhanlincui/web-performance-seo

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Install

npx -y skills add ComeOnOliver/skillshub --skill web-performance-seo

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What its author says it does

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Fix PageSpeed Insights/Lighthouse accessibility "!" errors caused by contrast audit failures (CSS filters, OKLCH/OKLAB, low opacity, gradient text, image backgrounds). Use for accessibility-driven SEO/performance debugging and remediation.

SKILL.md

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Web Performance SEO: Accessibility Contrast Error Fix

When to use

PSI/Lighthouse accessibility shows "!" or error instead of a numeric score
color-contrast audit errors or getImageData failures
Need to improve accessibility signals that impact SEO

Workflow

Reproduce
- Run Lighthouse or PSI; capture failing audit names.
Scan code for common triggers
- CSS filters/backdrop blur, mix-blend-mode
- OKLCH/OKLAB colors
- Low opacity backgrounds (< 0.4)
- Gradient text with color: transparent
- Text over images without opaque overlays
Fix in priority order
- Remove filters/blend modes
- Convert OKLCH/OKLAB to HSL/RGB
- Raise opacity thresholds
- Add solid-color fallback for gradient text
- Add overlay behind text on images
Verify locally with Lighthouse/axe
Verify in PSI after deployment

Fast scan commands

rg -n "backdrop-blur|filter:|mix-blend-mode" .
rg -n "oklch|oklab" .
rg -n "/10|/20|/30|opacity-25|opacity-0" .
rg -n "background-clip.*text|color.*transparent" .

Fix patterns

Remove filters (critical)

// Before
<div className="bg-card/50 backdrop-blur-sm">...</div>
// After
<div className="bg-card/80">...</div>

Convert OKLCH/OKLAB to HSL/RGB

/* Before */
:root { --primary: oklch(0.55 0.22 264); }
/* After */
:root { --primary: hsl(250, 60%, 50%); }

Raise opacity thresholds

Backgrounds >= 0.4 (prefer >= 0.6)
Replace /10 -> /40, /20 -> /40, /30 -> /60

Gradient text fallback

.title { color: #111111; }
@media (prefers-contrast: no-preference) {
  .title.with-gradient {
    background: linear-gradient(90deg, #0ea5e9, #6366f1);
    -webkit-background-clip: text;
    background-clip: text;
    color: transparent;
  }
}
@media (forced-colors: active) {
  .title.with-gradient { background: none; color: CanvasText; }
}

Overlay for text on images

<div className="relative">
  <img src="/hero.jpg" alt="Hero" />
  <div className="absolute inset-0 bg-black/60"></div>
  <h1 className="relative text-white">Title</h1>
</div>

Acceptance criteria

Accessibility score is numeric (not "!")
color-contrast audit passes or lists actionable items
Contrast ratios >= 4.5:1 for normal text, >= 3:1 for large text

Notes

"!" indicates audit failure, not a low score.
Always test locally before waiting for PSI updates.