Navigation from JavaScript through visualforce page in Classic and lightning experience

Hi,

When you want to navigate to other pages or record pages from Javascript via Visualforce pages in both Salesforce Classic and Lightning Experience then replace the window.location with the compatible options.

When your visualforce page is going to be accessible from both classic and lightning experience you have to write your navigation in Javascript as shown below.

Here :UITheme.getUITheme()  will be useful whether this page is accessed in lighting experience or not.

<apex:page standardController="Account" lightningStylesheets="true"> 
   <script>
     function isLightningExperience(){
        if (UITheme.getUITheme() === 'Theme4d' || UITheme.getUITheme() === 'Theme4u'){
            sforce.one.editRecord('{!Account.Id}');
        } else {
            window.location='/{!Account.Id}/e';
        }
    }
   </script>   
   <apex:form >   
     <apex:pageBlock >
       <apex:pageBlockSection title="Edit">
         <apex:commandButton value="Edit"
          onclick="javascript:isLightningExperience();return false;"/>
       </apex:pageBlockSection>
     </apex:pageBlock>
   </apex:form>   
   <apex:detail />     
</apex:page>


Reference:
https://help.salesforce.com/articleView?id=lex_prepare_vf_window.htm&type=5
https://developer.salesforce.com/docs/atlas.en-us.pages.meta/pages/salesforce1_dev_jsapi_sforce_one.htm
https://developer.salesforce.com/blogs/developer-relations/2016/09/why-its-time-to-break-up-with-javascript-buttons-and-embrace-lightning.html