我能在一个父元素上拥有多个角色吗?例如:
<div class="row">
<div class="col-sm-6" role="rowheader">
<p>Access to our award-wi</p>
</div>
<div class="col-xs-6 col-sm-3" role="row gridcell" > <<<
<img src="#{request.contextPath}/resources/books/images/icon_tick_table.png" role="gridcell"
alt="" title="s" class="table-image"/>
</div>
<div class="col-xs-6 col-sm-3">
<img src="#{request.contextPath}/resources/form/hello.jpg" role="gridcell"
alt=": Yes" title="s" class="table-image"/>
</div>
</div>