You see that in the "email" forms of for example most "contact" sites. Like, for example, here on HN, in the right end of the site's footer (on desktop), by cli

You see that in the "email" forms of for example most "contact" sites. Like, for example, here on HN, in the right end of the site's footer (on desktop), by clicking "Contact" (but this isn't a form, just a "mailto:..." link).