Do you want to add a row in an existing template (server-side / qweb) when the page is displayed, or do you want to add a row client-side after the page is loaded (javascript/jQuery) ?
Actually, I was trying to add a row to an HTML table through the WYSIWYG editor; but I figured it out. You have to move your cursor to the bottom, right cell and hit the enter key. Not terribly intuitive, but it works.
Do you want to add a row in an existing template (server-side / qweb) when the page is displayed, or do you want to add a row client-side after the page is loaded (javascript/jQuery) ?