Html elements pre, button, and hgroup

pre element Specifies that the enclosed text is preformatted and that whitespace should be preserved appropriately, button element Defines a clickable Button element, 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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pre pre and button, pre, button, and hgroup

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