Allow using a brief and semantically correct pseudo variable for CSS scale dependency rules: @sd (scale denominator)

Description

What is being compared in CSS is a scale denominator, not a scale. Allow using @sd in place of @scale for more compact, and semantically correct, scale dependency filters.
Eg:

Environment

None

Status

Assignee

Andrea Aime

Reporter

Andrea Aime

Triage

None

Components

Fix versions

Priority

Medium
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