Understanding HTML Validation

“Most people have encountered truly ‘bratty’ Web pages in their Websurfing careers†ó misbehaving pages that cause browser errors ranging from an abrupt termination to a complete system lockup. Almost invariably, these ill-behaved pages contain embedded HTML errors, or else they make extensive use of non-standard, browser-specific, quasi-HTML syntax. Regular and consistent use of HTML validators helps to identify and eliminate the embedded HTML errors that make for a bratty Web page.”