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Conceptual

Explain how things work — deep understanding questions

3 questions
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Egg

Fundamentals

1

Explain CSS Specificity

Specificity determines which CSS rules win. Senior engineers reason about it in terms of maintenance, not just math.

CSSFundamentals
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Hatchling

Intermediate

1

Explain the Virtual DOM

The virtual DOM is React's most misunderstood feature. Here's how to explain it like a senior engineer — focusing on why, not what.

ReactPerformanceBrowser APIs
2

How Does the JavaScript Event Loop Work?

The event loop question exposes whether you truly understand asynchronous JavaScript or just memorized callbacks vs promises.

JavaScriptBrowserAsync