Scenario
Client wanted to hide the ribbon from everyone except admin.
Solution
1. Open your SharePoint master page
2. Add the following style in head section
1.
<style type="text/css">
2.
#s4-ribbonrow { display : none; }
3.
</style>
3. Now find the start of the
"s4-ribbonrow" tag and add following this:
1.
<Sharepoint:SPSecurityTrimmedControl ID="SPSecurityTrimmedControl2" runat="server" PermissionsString="AddAndCustomizePages">
2.
<style type="text/css">
3.
#s4-ribbonrow { display : block; }
4.
</script>
5.
</Sharepoint:SPSecurityTrimmedControl>
4. Save the new master page and publish it.