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http://www.w3.org/html/wg/drafts/html/master/sections.html#the-section-element Second code example (with the inter-element whitespace removal) has title-cased element names. Authors using this may find their CSS being case-sensitive and body { } not targetting the element called <Body>. Suggest examples stick to lowercase. Possibly the style-without-inter-element-spacing would work better over at the li element, where often authors use display inline-block and may revert to this style for cross-browser spacing. Third example shows a <style> element inside HTML without the scoped attibute. Without scoped, style must be in the <head>.
HTML5.1 Bugzilla Bug Triage: Fixed, this seems to be fixed in the latest draft. If this resolution is not satisfactory, please copy the relevant bug details/proposal into a new issue at the W3C HTML5 Issue tracker: https://github.com/w3c/html/issues/new where it will be re-triaged. Thanks!