Hide the full ribbon for read only user.
Added a new tag for readonly user
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<pre lang="xml"><br />
<div class="s4-trc-container-menu1"><br />
<div><br />
<wssuc:Welcome id="IdWelcome1" runat="server" EnableViewState="false"><br />
</wssuc:Welcome><br />
<wssuc:MUISelector ID="IdMuiSelector1" runat="server"/><br />
</div><br />
</div><br />
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