| <!DOCTYPE html> | 
 | <link rel="author" title="Xiaocheng Hu" href="mailto:xiaochengh@chromium.org"> | 
 | <link rel="help" href="https://drafts.csswg.org/css-values-4/#calc-range"> | 
 | <link rel="help" href="https://drafts.csswg.org/css-counter-styles/#the-counter-style-rule"> | 
 | <link rel="match" href="negative-calc-to-non-negative-integer-ref.html"> | 
 | <meta name="assert" content="Negative calc() passed to <non-negative-integer> property value as argument should be addressed properly."> | 
 | <style> | 
 | @counter-style foo { | 
 |   system: additive; | 
 |   additive-symbols: 1 'I', calc(-1) 'X'; | 
 |   range: infinite infinite; | 
 | } | 
 | </style> | 
 | <ol style="list-style-type: foo" start=-1> | 
 | <li></li> | 
 | <li></li> | 
 | <li></li> | 
 | </ol> |