1. A key combination selected by the user agent that triggers the command
2. All HTML elements may have the accesskey attribute set
3. The accesskey attribute's value is used by the user agent as a guide for creating a keyboard shortcut that activates or focuses the element
4. If specified, the value must be an ordered set of unique space-separated tokens that are case-sensitive, each of which must be exactly one Unicode code point in length

<form action="/search">
    <label>Search: <input type="search" name="q" accesskey="s 0"></label>
    <input type="submit">
</form>