When I am trying to use Salesforce Lightning Design System in my vf page, I get error -
Unknown component apex:slds
while including <apex:slds />
on my vf page.
Unrelated - I have also tried uploading the slds css as static resource and including it in page, it messes up the standard header. Please see screenshot below
apex: slds
for slds in visualforce instead of linking slds.css manually