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Attribute srcset not allowed on element img at this point.

From: Ed Palmer <ed.palmer@gmail.com>
Date: Mon, 17 Dec 2012 08:26:52 -0500
Message-ID: <CAJ1o0bAfMosqicCro_-juOuALLJeXv03a=BcU=zTjNxeSReMog@mail.gmail.com>
To: www-validator@w3.org
Sample document:

When validating an English Wikipedia page, the error "Attribute srcset not
allowed on element img at this point" is displayed. This is due to the
srcset attribute being used to generate alternate images.

Srcset is not in the live HTML5 specification:

But is in the living standard:
Received on Tuesday, 18 December 2012 07:21:42 UTC

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