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Ethan SeagravesEthan Seagraves 

Part 2—Add dynamic blocks based on the user's theme

Regarding Part 2 in the Render a Visualforce Page Conditionally for the User Interface module of "Build Flexible Apps with Visualforce Pages and Lightning Components". 

Wrap the <apex:slds /> element with the following tag:
1<apex:outputPanel rendered="{! !isClassic}"> ... </apex:outputPanel>

I'm unfamliliar with what Wrap means in this context. I'm not a coder. 

For context, here is the entire portion of the step User-added image