Short answer: no, you cannot include a <span /> within an <input />.
You have a few options. You could use javascript to emulate behaviour like the email To: field. E.g. listen to key presses and handle actions like backspace after a ;.
Another option would be to make a list appear (css styled) like a textbox. Have the last <li /> contain a textbox with cleared styles. Every time the user adds a new email then insert a new <li /> before the textbox.
E.G.
html:
<ul class="email-textbox">
<li>[email protected];</li>
<li>[email protected];</li>
<li><input type="text" /></li>
</ul>
css:
.email-textbox {
background-color: #fff;
border: 1px solid #ccc;
padding: 2px 4px;
}
.email-textbox li {
display: inline-block;
list-style: none;
margin-left: 5px;
}
.email-textbox input {
background: none;
border: none;
}
javascript (jQuery, can change to vanilla)
$(function () {
$('.email-textbox').find('input').focus();
});
You will need to extend this javascript to include a keypress handler etc, but it gives the general idea.
Demo: http://jsfiddle.net/UeTDw/1/
Any option will require some javascript however.
If you can use jQuery, you could check out jQuery UI autocomplete
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