Tart is a free, simple to use and standalone web resource validator and editor that can be used to validate CSS, HTML, XHTML (including embedded CSS), and Atom/RSS feeds.

Validating local files can be difficult or impossible with web based tools. Tart can validate local files, even when you're offline, since it is a standalone application.

You can use the CSS Validator, Markup Validator and Feed Validator to validate your CSS, HTML and feeds, or you can test them all with Tart.

Finding problems isn't your goal, producing compatible web documents is. Tart allows you to categorize messages so that you can focus on real problems. And you can quickly repair problems using Tart's built in editor.

Here are some key features of "Tart":

Validate Everything Easily:
· Tart can validate the most common types of web resources: (x)html, css, rss, atom and sitemaps, so you can focus on testing and fixing problems instead of finding the right validator. Plus Tart runs on your workstation, so validating local and private resources is a snap.

Filter Diagnostics:
· Tart allows you to categorize and filter diagnostics, so you can utilize WAI-ARIA, webkit, mozilla, or other extensions without having to sift through the diagnostics reported to find the real problems. Simply create a category, and drag diagnostics to it. Then you can see the diagnostics that you want when you want.

Fix Problems Fast:
· Unlike other validators that just tell you where problems are, Tart has an integrated editor, so you can quickly get to the source of the problem, fix it, and retest, all in a single window.

Requirements:

· Java 1.5 or later

What's New in This Release: [ read full changelog ]

· Added Windows and Unix distributions.
· Added HTML5 and CSS3 support.
· Added Open Recent and other basic editing functions.
· Added font preferences.