var x=document.getElementById('myTable').rows;
var y=x[0].cells;
y[0].innerHTML="NEW CONTENT";
var y=x[0].cells;
y[0].innerHTML="NEW CONTENT";
var x=document.getElementById('myTable').insertRow(2);
var y=x.insertCell(0);
var z=x.insertCell(1);
y.innerHTML="NEW CELL1";
z.innerHTML="NEW CELL2";
var y=x.insertCell(0);
var z=x.insertCell(1);
y.innerHTML="NEW CELL1";
z.innerHTML="NEW CELL2";
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