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The target-densitydpi property is deprecated (http://www.w3.org/TR/2011/WD-css-device-adapt-20110915/#meta-properties) and no longer part of the HTML5 spec (http://dev.w3.org/csswg/css-device-adapt/#meta-properties). With many implementations in the wild, there needs to be a document to guide migration and describe solutions for use cases. The Window.devicePixelRatio property is the way to go now.
Reverting this bug's platform to All, as experience happens on all platforms.
New location: http://project.webplatform.org/content/issues/27