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TypeScript
Types, narrowing, generics, inference, and safer application code.
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39 questions
HTML
Document structure, semantics, forms, accessibility, and browser behavior.
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CSS
Layout, responsive design, selectors, the cascade, and rendering.
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JavaScript
Language fundamentals, the runtime, asynchronous code, and the DOM.
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React
Components, hooks, state, rendering, and application architecture.
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Node.js
The event loop, APIs, modules, streams, and backend fundamentals.