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CSS border issue with THEAD TBODY and COLSPAN

I have a problem with css / html table:
When I use ad and tbody tags with colspan attribute, the bottom border of the header is divided.
The size of the gap depends on the width of the border.

Do you have a solution to get a continuous border on the bottom of the header (without removing thead and tbody)?

JSFiddle example

table {
  border-collapse: collapse;
}

th {
  border: 4px solid red;
  border-bottom: 4px solid black
}

td {
  border: 4px solid blue;
}

thead tr {
  border-bottom: 5px solid green
}


table {
  border-collapse: collapse;
}

th {
  border: 4px solid red;
  border-bottom: 4px solid black
}

td {
  border: 4px solid blue;
}

thead tr {
  border-bottom: 5px solid green
}
with THEAD and TBODY but without COLSPAN
<table>
  <thead>
    <tr>
      <th>
        Column 1
      </th>
      <th>
        Column 2
      </th>
    </tr>
  </thead>
  <tbody>
    <tr>
      <td>
        Content 1
      </td>
      <td>
        Content 2
      </td>
    </tr>
  </tbody>
</table>
<br /> COLSPAN with THEAD and TBODY <span style="background:yellow">(css bug in the middle of green border ?)</span>
<table>
  <thead>
    <tr>
      <th>
        Column 1
      </th>
      <th>
        Column 2
      </th>
    </tr>
  </thead>
  <tbody>
    <tr>
      <td colspan="2">
        Content 1 and 2 (merged cells)
      </td>
    </tr>
  </tbody>
</table>
<br /> COLSPAN without THEAD and TBODY
<table>
  <tr>
    <th>
      Column 1
    </th>
    <th>
      Column 2
    </th>
  </tr>
  <tr>
    <td colspan="2">
      Content 1 and 2 (merged cells)
    </td>
  </tr>
</table>
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2 answers

The rendering angles between the folded borders do not seem well defined, so it’s not clear that this is actually a mistake, not just a deviation in behavior.

Firefox, - thead, , tbody :

thead:after {
    content:'';
    display:table-row;  /* see note below */
    position:absolute;
    visibility:hidden;
}

tbody tr:first-child td {
    border-top-width:0;
}

( , display:table-row . position:absolute display:block , table-row inline. , - -, .)

table {
  border-collapse: collapse;
}

th {
  border: 4px solid red;
  border-bottom: 4px solid black
}

td {
  border: 4px solid blue;
}

thead tr {
  border-bottom: 5px solid green
}

table ~ table thead:after {
    content:'';
    position:absolute;
    visibility:hidden;
}
table ~ table tbody tr:first-child td {
    border-top-width:0;
}
with THEAD and TBODY but without COLSPAN
<table>
  <thead>
    <tr>
      <th>
        Column 1
      </th>
      <th>
        Column 2
      </th>
    </tr>
  </thead>
  <tbody>
    <tr>
      <td>
        Content 1
      </td>
      <td>
        Content 2
      </td>
    </tr>
  </tbody>
</table>
<br /> COLSPAN with THEAD and TBODY <span style="background:yellow">(css bug in the middle of green border ?)</span>
<table>
  <thead>
    <tr>
      <th>
        Column 1
      </th>
      <th>
        Column 2
      </th>
    </tr>
  </thead>
  <tbody>
    <tr>
      <td colspan="2">
        Content 1 and 2 (merged cells)
      </td>
    </tr>
  </tbody>
</table>
<br /> COLSPAN without THEAD and TBODY
<table>
  <tr>
    <th>
      Column 1
    </th>
    <th>
      Column 2
    </th>
  </tr>
  <tr>
    <td colspan="2">
      Content 1 and 2 (merged cells)
    </td>
  </tr>
</table>
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0

, 4px/5px 1px. , , thead tbody, .

: https://developer.mozilla.org/en-US/docs/Web/HTML/Element/thead

0

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