agentsclimarketplace

Web performance seo

Skill bg-szy/TOP-SKILLS/skills/marketplace/web-performance-seo

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Install
npx -y skills add bg-szy/TOP-SKILLS --skill web-performance-seo

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What its author says it does

Copied from the file, not written here

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

2.6 KB, 682 tokens by cl100k_base, as published. Nobody here has run it

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

  1. Reproduce
    • Run Lighthouse or PSI; capture failing audit names.
  2. 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
  3. 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
  4. Verify locally with Lighthouse/axe
  5. 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.

Keep looking

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