HTML - HTML form validation without JavaScript

What it actually means

HTML provides built-in validation that runs before form submission. This happens at the browser level and requires no JavaScript.

How to use it correctly

Common attributes:

• required → field must be filled

• type="email" → validates email format

• type="url" → validates URLs

• min, max → numeric limits

• pattern → custom regex validation

• maxlength, minlength → text limits

Example:

<input type="email" required>
<input type="password" minlength="8" required>
<input type="number" min="1" max="10">

Why this matters

• Prevents invalid data at the earliest point

• Reduces JavaScript complexity

• Improves user experience with instant feedback

• Works even if JavaScript fails

Ignoring native validation is unnecessary overhead.

Accessibility impact

• Screen readers announce validation errors automatically

• Keyboard users get consistent behavior

• Error messages are standardized across browsers

Practical rule

Use HTML validation for basic checks.
Use JavaScript only for complex or cross-field validation.