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Limit of Stylelint's
declaration-property-value-no-unknown↩SCSS Variables 
Dollar Variables in PostCSS 
Native CSS Variables: Dangling transform functions that the rule would otherwise catch are ignored 
Note:
It is technically possible to make the rule work with these variables by playing with the rule's secondary option, that is, by providing a regex to
ignoreProperties.transformto describe a new acceptable property value pattern fortransformthat accounts for the use of variables.But constructing such regex is not trivial, as
transformtakes value in a wide range of forms, ranging from non-functional keywords, likenoneandinitial, to more than a dozen transform functions that take varying number of arguments (considermatrix3d(), specified with 16 values, andtranslateX(), which accepts only one), and the combination of any number of these functions.