http://validator.w3.org/check?uri=h...(detect+automatically)&doctype=Inline&group=0 自己看, Validation Output: 4 Errors 1. Error Line 29, Column 65: end tag for "tr" which is not finished. …lpadding="0" cellspacing="0" align="center"><tr></tr></table></td></tr></table> ✉ Most likely, you nested tags and closed them in the wrong order. For example <p><em>...</p> is not acceptable, as <em> must be closed before <p>. Acceptable nesting is: <p><em>...</em></p> Another possibility is that you used an element which requires a child element that you did not include. Hence the parent element is "not finished", not complete. For instance, in HTML the <head> element must contain a <title> child element, lists (ul, ol, dl) require list items (li, or dt, dd), and so on. 2. Error Line 59, Column 5: end tag for element "div" which is not open. </div> ✉ The Validator found an end tag for the above element, but that element is not currently open. This is often caused by a leftover end tag from an element that was removed during editing, or by an implicitly closed element (if you have an error related to an element being used where it is not allowed, this is almost certainly the case). In the latter case this error will disappear as soon as you fix the original problem. If this error occurred in a script section of your document, you should probably read this FAQ entry. 3. Error Line 59, Column 6: XML Parsing Error: Opening and ending tag mismatch: body line 23 and div. </div> ✉ 4. Error Line 61, Column 7: XML Parsing Error: Opening and ending tag mismatch: html line 2 and body. </body>