Insert @ into blank email inputs on focus if empty

email.js

/**
 * Insert @ into blank email inputs on focus if empty.
 */
$('input[type="email"]').focus(function() {
    var input = $(this);
    if (!input.val()) {
        input.val('@');
    }
}).blur(function() {
    var input = $(this);
    if (input.val() === '@') {
        input.val('');
    }
});