Currently the resolution-value is defined as:
The < resolution > unit represents the size of a single "dot" in a graphical representation by indicating how many of these dots fit in a CSS in, cm, or px.
However, no argument range is currently specified for the resolution unit, which would imply that zero and negative resolution values are valid.
Given the resolution is a ratio of physical "dots" to CSS px, in or cm, non-positive values do not make sense.
After discussing this issue with @emilio we thought it would be good if it would be well defined in the spec as [1, ∞].
MDN does currently mention a restriction to "strictly positive" that is not in the spec:
The < resolution > data type consists of a strictly positive < number > followed by one of the units listed below.
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