function readOnly(count){ }
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<apex:page controller="testController" showHeader="{!$User.UITheme == 'Theme3'}}"> </apex:page>
Please Try below code. Please Use this salesforce documentation for more information.
https://developer.salesforce.com/docs/atlas.en-us.pages.meta/pages/pages_variables_global_useruitheme.htm
Thanks
Hemant