1. css property: clip-rule: nonzero

  2. css property: fill-rule: nonzero

  3. attribute_values: nonzero unitless values (e.g. 5 to mean 500% the default thickness)

  4. elements: mfrac: linethickness: nonzero unitless values (e.g. 5 to mean 500% the default thickness)

  5. elements: mo: nonzero unitless values (e.g. 5 to mean 500%) for `lspace`, `maxsize`, `minsize` and `rspace` attributes

  6. elements: mpadded: nonzero unitless values (e.g. 5 to mean 500%)

  7. global_attributes: mathsize: nonzero unitless values (e.g. 5 to mean 500%)