Html elements header, strong, and hgroup

header element The HTML Header Element (<header>) represents a group of introductory or navigational aids, strong element Specifies that the enclosed text should be rendered in the browser as "strong" (usually bold) text, hgroup element The HTML Headings Group Element (<hgroup>) represents the heading of a section. These elements allows child elements from interactive, embedded, heading, sectioning, phrasing, and metadata content categories.

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header header and strong, header, strong, and hgroup

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