2.1.6 [DOM Level 2 - Style] Section 2.2.2, Style sheet creation
V0027:
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Interface DOMImplementationCSS (introduced in DOM Level 2). This interface allows the DOM user to create a CSSStyleSheet outside the context of a document. There is no way to associate the new CSSStyleSheet with a document in DOM Level 2
All Document Modes (All Versions)
The DOMImplementationCSS interface is not supported.