Information can be found on MDN: https://developer.mozilla.org/en-US/docs/Web/CSS/table-layout Gets if table and column widths are set by the widths of table and col elements or by the width of the first row of cells. Cells in subsequent rows do not affect column widths. Otherwise an automatic table layout algorithm is commonly used by most browsers for table layout. The width of the table and its cells depends on the content thereof.