Html elements iframe, strong, and hgroup

iframe element Defines an inline frame (ie a frame embedded in a document), 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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iframe iframe and strong, iframe, strong, and hgroup

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