Fix <apex:slds/> error in Lightning Community Builder preview - Ideas - Salesforce Trailblazer Community

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Fix <apex:slds/> error in Lightning Community Builder preview

Lightning Development

It seems a bug of Salesforce that the <apex:slds/> cannot get correct CSS in Lightning Community Builder preview window.

Reproduce steps:
  1. Create a Visualforce page with <apex:slds/> to use Lightning Design System. Remeber to check the option "Available for Lightning Experience, Lightning Communities, and the mobile app". Sample code:
    <apex:page >
      <apex:slds />
      <div class="slds-scope">
        <button class="slds-button slds-button_brand">Button</button>
  2. Create a new Community with "Customer Account Portal" template. Click the "Builder" in "My Workspaces" to open "Community Builder".
  3. Drag "Visualforce Page" from the "Components" toolbox to the page content. Select the test page that created in step 1 to display. The page is displayed in preview, but the SLDS css is not applied. In web browser console there are some errors like:   GET https://*,force:sldsTokens,force:base,force:formFactorLarge/slds.css net::ERR_ABORTED
  4. If you publish the community and view it, it is ok. Only the preview UI is broken.
We want this fix, because our product is a Visualforce component based on SLDS, and the customers want to use it in Conmunity Builder. But this problem caused the UI confused and customer feels bad.

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