How to eliminate white space between columns?

Question

I have the following table:

<table>
  <tr>
    <td style="border-top:1pt solid black">A</td>
    <td style="border-top:1pt solid black">B</td>
  </tr>
</table>

Note that by placing the edge on td's the row has no continuity from one column to another, but has a blank interval. How can I remove this space using border in td how are?

Result obtained:

Desired result:

Answer 1

Add style="border-collapse: collapse;" in the tag or css:

table {
border-collapse: collapse;
 }

<table>
  <tr>
    <td style="border-top:1pt solid black">A</td>
    <td style="border-top:1pt solid black">B</td>
  </tr>
</table>

Answer 2

The tag TABLE has a priority for this. Try the code below:

 <table cellpadding="0" cellspacing="0">