Steps to Reproduce

run

<spreadsheet id="spreadsheet" vflex="1" hflex="1" src="/book/blank.xlsx"
                     showToolbar="true" showSheetbar="true" showFormulabar="true" showContextMenu="true"/>

Current Result

you can see the dom id
<div class="k-toolbar-btn-dropdown k-icon-dropdown" id="dropdown-paste" data-toggle="dropdown" data-offset="-18"></div>

Expected Result

no id or generated id
which mean there could be two spreadsheet in one page