5 - CSE HTML Validator

Ref: CSE HTML Validator. "CSE HTML Validator is a desktop application for Microsoft Windows XP, Windows Server 2003, Windows Vista, Windows 7, and Windows 8/8.1. It is developed and sold electronically by AI Internet Solutions LLC located in the Dallas–Fort Worth metroplex. The first version of CSE HTML Validator was released in 1997 for Windows 95. The current version is 14.03 (as of May 15, 2014). CSE HTML Validator is designed to help web developers create syntactically correct and accessible HTML, XHTML, and CSS documents (including HTML5 and CSS3) by locating errors and potential problems."