LESS processes non-spec properties

[corysimmons]

We've had a few complaints from people using LESS that our PostCSS grid system isn't working when used with LESS.

• undefinedn with LESS peterramsing/lost#178
• Cycle not automatically being set to denominator peterramsing/lost#229 (comment)

It seems like LESS is tripping up when it gets to a property that is set as a fraction (e.g. lost-column: 1/3;).

Is this anticipated behavior? Would it be possible for LESS to ignore entire non-spec CSS declarations (or at least their properties)?

[seven-phases-max]

See --strict-math. (And escaping as a workaround when --strict-math=on is not desired).

For a discussion on possible improvements see #1880.

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As for "non-spec" declarations, in Less there's no difference between color, lost-column or fnord property names. It's totally property identifier agnostic (well, not counting some "to-be-removed" exceptions also mentioned in #1880).

[seven-phases-max]

Closing as expected behavior.

[peterramsing]

Yup, this looks to be expected and even documented. Thanks @seven-phases-max for the explanation! 😄