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→Legal Values
<tr><td>elements</td><td>Multiple elements may be selected.</td></tr>
<tr><td>all</td><td>The contents must either be selected in entirety or none at all.</td></tr>
<tr><td>toggle</td><td>unknownThe contents are selected "following a standard toggling content model" [http://www.blooberry.com/indexdot/css/properties/extensions/nsextensions.htm].</td></tr>
<tr><td>tri-state</td><td>unknown</td></tr>
<tr><td>-moz-all</td><td>unknown</td></tr>
