This isn't a standard right now, and we won't be exposing it by default until that changes. I would propose that we nominate the shipping bug, unless you want to highlight that people can test it by turning on the pref?
Bug 1688879 Comment 38 Edit History
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This isn't a standard right now, and we won't be exposing it by default until that changes. This proposal unfortunately shipped extremely early in chrome without standards integration and has made a bit of a mess. They're aware of this though. I would propose that we nominate the shipping bug, unless you want to highlight that people can test it by turning on the pref?