Nest your tags properly, example if you open a TR close a TR, if you open a SPAN inside a TD make sure you close the SPAN before you close the TD.
===Bold and Italics===
HTML 5 specification states that important text should be denoted with the '''strong''' tag not bold ('''b''' tag) and emphasized text should be denoted with the '''em''' tag not italic ('''i''' tag). Bold and I tags are not perceivable to user agents.
===Underlined text===
Generally don’t underline text on the web that is not a link. Underlines are strongly perceived to be a clickable link which will confuse and frustrate users. Use '''strong''' or '''em''' tags to denote importance and avoid the '''u''' tag.
===Font Tag===
The font tag is not supported in HTML5 use semantic elements to indicate emphasis or structure and CSS to handle styling.
===Declare language===