Real-time validation: don’t nag while typing

Try the micro-demo: realtime-validation-demo.html

What goes wrong

If the UI shows “Enter a valid email” on every keystroke, it can feel like the form is yelling at you while you’re still typing. For some screen reader users, rapidly-changing status text can also create repeated announcements.

Better patterns

• Validate on blur (when the user leaves the field), and only then mark aria-invalid="true".
• Debounce validation during typing (e.g., wait 500–800ms after the last keystroke).
• Keep helper text stable while typing; avoid flashing red error boxes that appear/disappear repeatedly.

Why this helps

It reduces distraction, avoids “error spam”, and makes it clearer when the user is actually expected to fix something (as opposed to still providing input).