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Get Started Free →mkurman/best-practices
Apply modern web development best practices for security, compatibility, and code quality.
Passed 22 of 22 test cases with the skill, and 21 of 22 without it.
1 fixed21 passed either way0 still failing0 broke
Tokens, turns and time describe resource use, not a dollar price.
A test case the skill fixed. Same model, same prompt, with and without the skill.
Write a class-based React component designed to catch JavaScript runtime errors anywhere in its child component tree and render a fallback UI. Include the necessary lifecycle methods.
| Checked | Without skill | With skill |
|---|---|---|
| Implements static getDerivedStateFromError to update component state when an error is thrown | Passed | Passed |
| Implements componentDidCatch to log error details to an external tracker | Missed | Passed |
The instructions your model reads when the skill loads.
// ❌ document.write (blocks parsing)
document.write('<script src="..."></script>');
// ✅ Dynamic script loading
const script = document.createElement('script');
script.src = '...';
document.head.appendChild(script);
// ❌ Synchronous XHR (blocks main thread)
const xhr = new XMLHttpRequest();
xhr.open('GET', url, false); // false = synchronous
// ✅ Async fetch
const response = await fetch(url);
// ❌ Application Cache (deprecated)
<html manifest="cache.manifest">
// ✅ Service Workers
if ('serviceWorker' in navigator) {
navigator.serviceWorker.register('/sw.js');
}
// ❌ Non-passive touch/wheel (may block scrolling)
element.addEventListener('touchstart', handler);
element.addEventListener('wheel', handler);
// ✅ Passive listeners (allows smooth scrolling)
element.addEventListener('touchstart', handler, { passive: true });
element.addEventListener('wheel', handler, { passive: true });
test cases passed, vs 21 / 22 without
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