Have you ever looked at your HTML or JSX code and thought, “Why is this not working?” 🤔
You’re not alone. Even experienced developers make basic mistakes while writing HTML or JSX.
These small errors may look harmless, but they can hurt performance, accessibility, and maintainability.
Today, we’ll break down 5 common mistakes that 99% of developers make—and how you can avoid them easily.
Trust me, fixing these is as easy as unlocking your phone once you know the password 📱😉
What Is “5 Mistakes That 99% Developers Make While Writing HTML or JSX”?
This topic focuses on the most common errors developers make when writing markup for the web.
HTML is the backbone of the web.
JSX is HTML-like syntax used in React and Next.js.
Because JSX looks like HTML, developers often mix rules, skip best practices, or ignore standards—leading to bugs and messy code.
Why This Topic Matters (More Than You Think)
Bad HTML or JSX doesn’t just look ugly—it causes real problems:
- Slower page load ⏳
- Poor SEO rankings 📉
- Accessibility issues ♿
- Hard-to-maintain code 😵
- Unexpected UI bugs 🐛
In professional life, clean markup = fewer bugs + happier teams + better products.
Benefits of Writing Clean HTML & JSX (Real-Life Examples)
When you fix these mistakes, you get:
- ✅ Better SEO (Google loves clean HTML)
- ✅ Faster rendering in React apps
- ✅ Easier debugging (future you will thank you)
- ✅ Improved accessibility for all users
- ✅ Professional-quality code for jobs & clients
Example:
A simple semantic <button> instead of a <div> can fix keyboard navigation issues instantly. Small change, huge impact.
Comparison: Bad Practices vs Good Practices
❌ Bad HTML / JSX
-
<div>used everywhere - Missing
altattributes - Inline styles everywhere
- No
keyin lists - Messy, unreadable markup
✅ Good HTML / JSX
- Semantic tags (
header,main,footer) - Accessible attributes
- Reusable components
- Proper keys in lists
- Clean and readable structure
Good code scales. Bad code breaks.
The 5 Biggest Mistakes Developers Make
1. Using Too Many <div> Tags
<div> is not evil—but overusing it is 😅
Semantic tags help browsers and screen readers understand your layout.
Use instead:
<section>, <article>, <nav>, <header>, <footer>
2. Forgetting key Props in JSX Lists
React uses key to track list items.
No key = unexpected UI bugs.
items.map(item => <li key={item.id}>{item.name}</li>)
Simple fix. Big win.
3. Ignoring Accessibility (alt, label, aria)
Skipping accessibility is one of the most common mistakes.
- Missing
alton images - Inputs without
<label> - Buttons without clear text
Accessibility is not optional—it’s professional.
4. Mixing Logic Directly Inside JSX
Too much logic inside JSX makes code unreadable.
❌ Bad:
{user && user.isAdmin && user.permissions.includes("edit") && ...}
✅ Better:
const canEdit = user?.isAdmin && user?.permissions.includes("edit");
Clean JSX = happy brain 🧠
5. Inline Styles Everywhere
Inline styles kill reusability and consistency.
Instead:
- Use CSS classes
- Tailwind utility classes
- Styled components (if needed)
Your UI becomes easier to maintain and scale.
Best Tips: Do’s & Don’ts
✅ Do’s
- Use semantic HTML
- Keep JSX clean and readable
- Break UI into components
- Follow accessibility basics
- Format your code properly
❌ Don’ts
- Don’t abuse
<div> - Don’t ignore warnings
- Don’t write complex logic in JSX
- Don’t skip
keyprops - Don’t rush markup writing
Common Mistakes Recap
Most developers:
- Focus only on JavaScript
- Ignore markup quality
- Copy-paste without understanding
- Skip accessibility
- Think “HTML is easy, no need best practices”
That mindset costs time later.
Conclusion: Write Less Bugs, More Clean Code 🚀
HTML and JSX are not “just markup”—they define how your app feels, performs, and scales.
Fixing these mistakes will instantly make your code:
- Cleaner
- Faster
- More professional
👉 Want more practical developer blogs like this?
Visit https://hamidrazadev.com and level up your frontend skills today!
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