header, for a table see <thead>

header cell see <th>

header information see <article-meta>

@headers

Headers (NISO JATS table model)

heading see <term-head> see <title>

heading, definition use <def-head>

heads, article see <front>

hierarchical keyword see <nested-kwd>

highlight see <bold> see <italic> see <monospace> see <sc> see <underline>

Historical Date Attributes parameter entity see %date-atts;

holder, copyright use <copyright-holder>

honorific use <prefix>

horizontal alignment see @char

Horizontal Alignment (NISO JATS table model)

Horizontal Alignment Attributes For Cell Contents parameter entity see %CellHAlign.attrib;

horizontal offset use @charoff

Horizontal Rule

Horizontal Rule Attributes

horizontal spanning use @colspan

how to tag citations see Tagging References

<hr>

%hr-atts;

Href (Linking Mechanism)

human-readable see @description

hypothesis, mathematical use <statement>