Telephone and email links
An anchor can hand a phone number or email address to the user’s preferred app. The link stays semantic, keyboard accessible, and useful without JavaScript.
<a href="tel:+391234567890">+39 123 456 7890</a>
<a href="mailto:hello@example.com?subject=Hello">
hello@example.com
</a> Keep the visible value understandable and copyable. Query parameters in mailto: links must be URL-encoded.