Answers for "table header"

table fixed header

.tableFixHead thead th { position: sticky; top: 0; }

html header for all the table

<th colspan="3">    </th>

html tables

<table></table>
    <td></td> <!-- td is a table cell-->
    <tr></tr> <!-- tr is a table row-->
    <th></th> <!-- th is the table header -->
    <thead></thead><tbody></tbody><tfoot></tfoot> <!-- table semantic -->
    <tr rowspan="2"></tr><!-- Span a row -->
    <tr colspan="2"></tr><!-- Span a column -->