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<b>and<i>tags and they are semantically different from<strong>and<em>. Not requesting to change rules, but why do you define the mapping that way? \$\endgroup\$[b]into<strong>and[i]into<em>. And so does Markdown on this very site with**this**and*this*. \$\endgroup\$[,]seems to contradict malformed, or unknown tags are left as literal text. \$\endgroup\$<strong>and<b>have different semantics in HTML5 and are not interchangeable.<b>is for general marker for drawing attention or keywords.<strong>is for making importance in text/speech. The**this**in Markdown translates better to<b>and not<strong>. Likewise for<i>(general marker for loanwords, scientific terms and titles) and<em>(stress or emphasis in speech). See also: FAQ from WHATWG \$\endgroup\$