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Section 9.3 The content element "Context Where flow content is expected." "flow content" is a link to this URL: http://www.whatwg.org/specs/web-apps/current-work/multipage/elements.html#flow-content-0 But it's broken.
Thank you. Fixed in https://github.com/w3c/webcomponents/commit/416ad0180985619984546b5ad5aa0843aa3c5bd3