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"An AMP page MUST contain a <script async src="https://cdn.ampproject.org/v0.js"></script> https://cdn.ampproject.org/v0.js"></script> tag inside their head tag
by cryptarch 10y ago
"An AMP page MUST contain a <script async src="https://cdn.ampproject.org/v0.js"></script> https://cdn.ampproject.org/v0.js"></script> tag inside their head tag."
AMP requires a script loaded from one particular URL and is designed so that it's incompatible with browsers that don't support Javascript, i.e. <img> tags are replaced by <amp-img> and thus images won't work without the AMP script.
It might formally be a subset of HTML but it is one that excludes non-JS-supporting user agents by means of custom tags which are interpreted by "the AMP engine" script.