Writing rules

The source code must comply with the following rules in accordance with the document type declaration used in the page

• No opening or closing tags without < or > (example of error: li>bike);
• no closing tag with / missing (example of error: <li>bike<li>);
• no attribute values with " or ' missing (example of error: alt="bike);
• no multiple attribute values separated by a space without " or ' (example of error: alt=my beautiful bike);
• no missing spaces between attributes (example: alt="bike"title="bike");
• no missing closing tag for elements that require one (example of error: <object> without </object>).