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• The heading hierarchy of an iframe SHOULD be designed to fit within the heading hierarchy of the parent document, if possible.
• Hidden frames or frames that do not convey content to users SHOULD be hidden from assistive technologies using aria-hidden="true".

Other (content)

Required

• Critical emphasis in the text SHOULD be conveyed through visual styling.
• Critical emphasis in the text SHOULD be conveyed in a text-based format.
• The <blockquote> element SHOULD be used to designate long (block level) quotations.
• The <blockquote> element SHOULD NOT be used for visual styling alone.
• The <q> element (for inline quotations) SHOULD NOT be used as the only way to designate quotations.
• Code SHOULD be marked with the <code> element and styled to look different from non-code text.
• Blocks of code SHOULD be formatted with the <pre> element.
• Strikethrough text SHOULD be marked with the <del> element.
• Text designated for insertion SHOULD be marked with the <ins> element.
• Highlighted text SHOULD be marked with the <mark> element.
• Critical highlighted text SHOULD be supplemented with a text-based method to convey the meaning of the highlighting.

Non-required / best practice

• Critical strikethrough text MUST be supplemented with a text-based method to convey the meaning of the strikethrough.
• Critical text designated for insertion MUST be supplemented with a text-based method to convey the meaning of the insertion.