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JSFiddle - React, Tailwind, and code Playground

HTML

<table class="tabel_op_panou" style="margin: 0px 2px 0px 2px; width: 99%;border:1px solid grey;table-layout:fixed;">
    <col style="width: 35%;"/>
    <col style="width: 8%;"/>
    <col style="width: 17%;"/>
    <col style="width: 8%; "/>
    <col style="width: 17%;"/>
    <col style="width: 15%;"/>
<tr>
    <th rowspan="2" style="width: 35%; border:1px solid grey;">A</th>
    <th colspan="2" style="width: 25%; border:1px solid grey;">B</th>
    <th colspan="3" style="width: 40%; border:1px solid grey;">C</th>
</tr>
<tr>
    <th style="width: 8%; border:1px solid grey;">B1</th>
    <th style="width: 17%; border:1px solid grey;">B2</th>
    <th style="width: 8%; border:1px solid grey;">C1</th>
    <th style="width: 17%; border:1px solid grey;">C3</th>
    <th style="width: 15%; border:1px solid grey;">C4</th>
    </tr>
</table>

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JSFiddle - React, Tailwind, and code Playground

HTML

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Use pre-released features

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Console