What does `mailto:` do when there is no email client?

Question

I am developing a website.

What does mailto: open in if there is no email client (like Outlook, Thunderbird, etc.)? It works on my computer, which has Outlo

Answer 1

The following solution works for me:

(function($)) {
  $('a[href^=mailto]').each(function() {
    var href = $(this).attr('href');
    $(this).click(function() {
      var t;
      var self = $(this);

      $(window).blur(function() {
        // The browser apparently responded, so stop the timeout.
        clearTimeout(t);
      });

      t = setTimeout(function() {
        // The browser did not respond after 500ms, so open an alternative URL.
        document.location.href = '...';
      }, 500);
    });
  });
})(jQuery);

For more info see: https://www.uncinc.nl/articles/dealing-with-mailto-links-if-no-mail-client-is-available