Panel-ready Frontend Master questions for freshers and experienced developers. Practice at Coding Cadre in Faridabad, or Online from Delhi NCR.
rem is relative to the root font size
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It short-circuits when a middle value is null or undefined instead of throwing.
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Keys tell React which item is which across renders so state stays on the right row.
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I lift state carefully, keep props stable, and split components so heavy UI does not sit under chatty parents.
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Forced sync layout shows up when you read layout then write styles in a tight loop.
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A focus trap keeps Tab cycling inside a modal so keyboard users do not escape into the page behind.
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Tokens for color and space, documented components, and lint rules against raw hex in apps.
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XSS exfiltrates tokens, mixed content loads bad scripts, and verbose errors reveal internals.
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Component tests catch prop and state bugs fast.
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