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mathewi Because <img> is a web standard. <amp-img> is nonsense only understandable by AMP. Asking us to replace one with the other...
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mathewi ...is asking us to make our websites non-HTML compliant and unreadable to a swath of non-Google-approved tools.
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mathewi Here is the HTML5 specification - w3.org/TR/html5/. There's no 'amp-' in there. AMP is making up HTML tags unilaterally.