JSFiddle - React, Tailwind, and code Playground
HTML
<form>
<input type="email" required pattern="[^@]+@[^@]+\.[a-zA-Z]{2,6}">
<input type="submit">
</form>
<form>
<input type="email" required pattern="[^@]+@[^@]+\.[a-zA-Z]{2,6}">
<input type="submit">
</form>