
PASS Property background-clip value 'border-box' computes to 'border-box' 
PASS Property background-clip value 'padding-box' computes to 'padding-box' 
PASS Property background-clip value 'content-box' computes to 'content-box' 
PASS Property background-clip value 'border-box, padding-box, content-box' computes to 'border-box'