How to select all diagonal cells in table ?

<table border="1" style="width:100%" id="table">

1.1
2.1
3.1
4.1
5.1

1.2
2.2
3.2
4.2
5.2

1.3
2.3
3.3
4.3
5.3

1.4
2.4
3.4
4.4
5.4

1.5
2.5
3.5
4.5
5.5

<br> let tableEl = document.getElementById("table");<br> let tableRows = document.querySelectorAll("table tr");</p> <div class="highlight"><pre class="highlight plaintext"><code>let ind=0; while(tableRows[ind]){ tableRows[ind].cells[ind].style.backgroundColor = "red"; ind++; } </script> </code></pre></div>