Populate or fill HTML table with random data in vanilla JavaScript

HtmlTableFillPopulateVanillaJS.js

var table_selector = '#table_id';
var i = 0; 
var content_length = 15;
document.querySelectorAll(table_selector + ' tr').forEach((row, i) => {
	row.querySelectorAll('td').forEach((td, j) => {
		td.innerHTML = Math.random().toString(36).replace(/[^a-z]+/g, '').substr(0, content_length);
	});
});