8000 [css-2015] Add definition of prefixed syntax. · w3c/csswg-drafts@e8c66f0 · GitHub
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[css-2015] Add definition of prefixed syntax.
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‎css-2015/Overview.bs‎

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@@ -434,6 +434,9 @@ Proprietary and Non-standardized Features</h4>
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Issue: Rewritten as open vs. closed systems instead of Web vs. non-Web, per szilles' request.
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To avoid clashes with future CSS features, the CSS2.1 specification
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reserves a <a href="http://www.w3.org/TR/CSS21/syndata.html#vendor-keywords">prefixed
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syntax</a> for proprietary and experimental extensions to CSS.
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A CSS feature is a <dfn>proprietary extension</dfn> if it is meant for use
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in a closed environment accessible only to a single vendor's user agent(s).
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A UA should support such <a>proprietary extensions</a>

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