someId, you have to use
var table = document.getElementById('someId');) and then either manipulate its
table.innerHTML (probably a good starting point) or its children using DOM API: say, for this page ("Parameter Values" table) you may try in browser console:
// first table with the "w3-table-all notranslate" class var table = document.getElementsByClassName("w3-table-all notranslate"); table .children // will get the tbody element .children // will get the second row from the tbody element .children // will get the first (colomn) cell in the second row .innerHTML; // will show you html contents of the cell in the console // change the cell contents table.children.children.children.innerHTML = "<b>I've changed this stuff!</b>"; // you may also want to remember rows/cells: var row = table.children.children; var cell = row.children;
And basically that's it.