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				<tr><td valign="top" class="name">optgroup</td><td valign="top" nowrap class="compatibility">NN <span class="emphasis">6</span> IE <span class="emphasis">5(Mac)/6(Win)</span> DOM <span class="emphasis">1</span></td>
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					<td valign="top" colspan="2" class="description"><p><span class="literal">optgroup</span> IuWFNg <span class="literal">optgroup</span> vfɑΉIuWFNgłB̗vf́A <span class="literal">select</span> vfɃlXgĂA܂ option vf͂ł܂B̗vf̃uEUɂT|[g󋵂ɂẮA 8 ͂ <span class="literal">optgroup</span> vfQƂĂB̃IuWFNgł́A{͖`̋ʂ̃vpeB̐ɂ <span class="literal">disabled</span> vpeBgpł܂B̃vpeB́Adisabled ̃Xe[^XɂAlXgꂽ <span class="literal">option</span> vfɉe^܂B
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					<td valign="top" colspan="2" class="CLEARSEPARATION">&nbsp;</td>
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					<td valign="top" colspan="2" class="htmlequivalent"><span class="title"> HTML R[h</span></td>
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					<td><span class="programlisting"><pre>&lt;optgroup&gt;</pre>
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					<td valign="top" colspan="2" class="objectmodelreference"><span class="title">IuWFNgQ</span></td>
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					<td><span class="programlisting"><pre>[window.]document.getElementById("<span class="replaceable">elementID</span>")</pre>
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					<td valign="top" colspan="2" class="objectspecificproperties"><span class="title">IuWFNgŗL̃vpeB</span></td>
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					<td colspan="2"><p><span class="literal">label</span></p>
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					<td valign="top" colspan="2" class="CLEARSEPARATION">&nbsp;</td>
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					<td valign="top" colspan="2" class="objectspecificmethods"><span class="title">IuWFNgŗL̃\bh</span></td>
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					<td colspan="2"><p>Ȃ </p>
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					<td valign="top" colspan="2" class="objectspecificeventhandlerproperties"><span class="title">IuWFNgŗL̃Cxgnh[vpeB</span></td>
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					<td colspan="2"><p>Ȃ </p>
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				<tr><td valign="top" class="name">label</td><td valign="top" nowrap class="compatibility">NN <span class="emphasis">6</span> IE <span class="emphasis">5(Mac)/6(Win)</span> DOM <span class="emphasis">1</span></td>
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					</td><td valign="top" nowrap class="requirements">ǂݏ</td>
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					<td valign="top" colspan="2" class="description"><p><span class="literal">optgroup</span> vf <span class="literal">label</span> ɑΉvpeBłB
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					<td valign="top" colspan="2" class="value"><span class="title">l</span></td>
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					<td colspan="2"><p></p>
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					<td valign="top" nowrap colspan="2" class="default"><span class="title">l</span></td>
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					<td colspan="2"><p>Ȃ</p>
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