HTML & CSS are very important for React.js developers — they’re like the foundation React builds on top of. Here’s why:
🧱 HTML (or JSX in React)
React uses JSX, which is basically JavaScript + HTML. If you don’t understand HTML structure, you’ll struggle to build components effectively.
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Need to build buttons, forms, layouts? That's all HTML.
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React components return JSX, and JSX is just HTML-like syntax.
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Accessibility (ARIA, semantic tags) is crucial in modern apps — that’s HTML knowledge.
✅ You don’t need to memorize every tag, but you should be very comfortable with layouts, forms, and semantic HTML.
🎨 CSS
React doesn’t replace CSS. You still need to style everything.
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You'll often write CSS Modules, styled-components, TailwindCSS, or inline styles — but the core is still CSS.
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Understanding things like Flexbox, Grid, media queries, and positioning is essential.
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CSS-in-JS makes styling more dynamic, but it still uses the same principles.
✅ You don’t have to be a designer, but you should know how to bring a design to life.
🔁 TL;DR: React ≠ Replacement for HTML & CSS
React is the logic layer and HTML/CSS are the presentation layers. Mastering all three makes you a complete front-end developer.