Hi Alex, I was not aware of that. Thanks for the heads up. Now that I read up on it I can only assume that the content within this block should not (yet) be shown to a user, regardless of the device/browser/screen reader they use.
My guess is that people at the WhatWG proposed this attribute to off-load the overburdened 'display'. In reality I think that adding all these tags and attributes makes the whole of internet pages eventually harder to spider. A living standard, really? I am beginning to understand Tim Berners Lee better and better in his choices for XHTML2 and the semantic web.
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