Can I use html5 data attribute in HTML select box element?

Any idea can I use .data attribute in HTML select box?I red HTML5 documents but I didn't find any information that could help me.

Is it legal:

<span>Select depatament</span>
<span>
    <select id="department" onchange="EnableSelectBox(this)" data-spacing="10cm">
        <option selected disabled>-Select-</option>
    </select>
</span>