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HTML/CSSIntermediate#html#forms#validation

How do you validate a form using native HTML attributes?

Attributes like required, pattern, min, max, minlength, maxlength, and type trigger built-in browser validation without JavaScript. The :invalid and :valid CSS pseudo-classes can style fields based on validity, and the Constraint Validation API (checkValidity()) allows custom JS hooks.

Example
<form>
  <input type="text" pattern="[A-Za-z]{3,}" required title="At least 3 letters">
  <input type="email" required>
  <button type="submit">Submit</button>
</form>

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