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