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Clever templating use cases can optimize memory usage by sharing template content. e.g. <template iterate="foo"> <span>{{ Person }}</span> <template iterate="stuffInPocket"> <span>{{ whatsInPocket }}</span> </template> </template> --- The templating library is likely to stamp out multiple copies of <span>{{ Person }}</span> <template iterate="stuffInPocket"> <span>{{ whatsInPocket }}</span> </template> maybe there's some way that each instance doesn't have to have a generated <template> element that contains exactly the same <span>{{ whatsInPocket }}</span> content docFrag --- we could make content read-write, but then badness might occur if the content is assigned a docFrag owned by the outer document.
Changing the category: From: WebAppsWG => Components Model To: WHATWG => HTML
Seems this is old feedback about the original design, not against the current specification.