* Table row template with legacy extra column for backlink symbol, uncombined footnotes.
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* - Bugfix: Reference container: option to restore pre-2.0.0 layout with the backlink symbol in an extra column.
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* @since 2.1.1
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* - Bugfix: Reference container: apply web semantics to improve readability for assistive technologies, thanks to @derivationfr issue report and code contribution.