• Google test return errors if the A tags have REL set to unsupported values, or to more than one value. If the REL=”attachment”, all is OK, but if it is REL=”attachment lightbox”, test fails. I have set lightbox as REL for some of the image I added, and I have had to make manual changes to posts to remove it. It would be useful if the AMP plugin formats things like this automatically, and clean up the REL (and maybe other tag attributes) before output.

    Milan

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