The sectioning elements act quite literally as their name suggests: they define sections of the parent element. These sections can be thought of as child nodes whose headings fall under their parent heading, regardless of their rank.
Document Outlines | HTML5 Doctor - 0 views
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Sections may contain headings of any rank, but authors are strongly encouraged to either use only h1 elements, or to use elements of the appropriate rank for the section’s nesting level.
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For accessibility reasons, we recommend each sectioning element have a heading, even <aside> and <nav>, as shown below. If you don’t want these headings to be visible, you can always hide them with CSS.
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:required | CSS-Tricks - 0 views
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The :required attribute works on radio buttons. If you put required on one radio button (or all), that particular group of radio buttons will be required. On checkboxes, makes each individual checkbox required (to be checked).
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