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Code Analysis
JavaScript
CSS
HTML
// Modern JavaScript features - try modifying this code const dialog = document.querySelector('dialog'); // Dialog API - check compatibility if (dialog?.showModal) { dialog.showModal(); } else { // Fallback for older browsers dialog.style.display = 'block'; } // Array.at() method const items = ['apple', 'banana', 'cherry']; const lastItem = items.at(-1); // Optional chaining and nullish coalescing const user = data?.user?.profile?.name ?? 'Anonymous'; // Temporal API (experimental) if (typeof Temporal !== 'undefined') { const now = Temporal.Now.instant(); console.log(now.toString()); } // Object.hasOwn() method if (Object.hasOwn(user, 'email')) { console.log('User has email'); }
15 lines
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612 characters
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0 features detected
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Compatibility Analysis Results
📊 Live Analysis
Features Found:
0
Risk Level:
-
Compatibility Score:
100/100
🌐 Support Levels
Widely Available
Safe to use everywhere
Newly Available
Recently became baseline
Limited Support
Use with caution
Unsupported
Needs polyfill
🔍 Detection Database
• Dialog API patterns
• CSS Container Queries
• Array.at() method
• Optional chaining (?.)
• Nullish coalescing (??)
• Object.hasOwn()
• Temporal API
• CSS :has() selector
• Fetch API
• ES6 Modules
...and 50+ more
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⚡ Performance Impact
Bundle Size Impact:
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Runtime Overhead:
Minimal
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