
CSE HTML Validator Professional integrates a powerful, lightweight, clean HTML/text editor with CSE's famous validation engine that produces intelligent, understandable results. Notice that the line in the document with the validator message is highlighted in red to indicate an error occurred on the line. Notice also that the message in the Results Window has been selected causing the text responsible for the message to be highlighted with green text and a black background.

Here is a screenshot of the editor with the Resource and Results Windows hidden. It shows the editor with these options on: line numbers, right margin, gutter, word wrap, and horizontal split view mode. Notice that with split view mode, you can easily edit two documents simultaneously, or two different parts of the same document. Notice also that bookmarks are being used (see the gutter) to quickly navigate to bookmark positions.

CSE v4.5 adds an integrated web browser (requires Internet Explorer). Browse the web with the integrated browser and HTML Validator simultaneously displays the HTML source of the page that you are viewing. HTML Validator can automatically validate the pages you visit as you browse the web! This is great for testing the output of dynamic pages that use ASP, PHP, CFML, or similar technologies. The integrated browser also doubles as a browser preview for the documents that you are currently editing.

The new Grouped Messages tab in CSE v4.5 organizes messages by category and separates them from the more important error and warning messages which are normally concentrated in the Messages tab.

The powerful Batch Wizard (not included in the standard edition) lets you create a list of targets and then validate all of them at once. The targets can be files, directories, or URLs. A single or multiple report in HTML format is generated with the results of all the targets. The Batch Wizard in v4.5 can also follow links when validating or link checking.