Position	Website	Change	Thumbnail
1	jigsaw.w3.org - Jigsaw Overview	0
2	validator.w3.org - The W3C Markup Validation Service W3C	0
3	css-validator.org - The W3C CSS Validation Service	0
4	csslint.net - CSS Lint	0
5	htmlvalidator.com - CSE HTML Validator - Powerful HTML Validator, XHTML Validator, CSS Validator, and More CSE HTML Validator is a powerful and easy to use offline HTML, XHTML, CSS, JavaScript, and PHP syntax checker, HTML validator, XHTML validator, access...	0
6	stackoverflow.com - Stack Overflow	0
7	cssportal.com - CSS Portal - Templates, Tutorials, Books, Software, Code Examples A collection of quality resources all geared towards CSS. Resources include: Templates, Books, Software and code examples.	0
8	freehtmlvalidator.com - CSE HTML Validator Lite - FREE HTML Editor and Syntax Checker for Windows A free HTML syntax checker for Microsoft Windows from the developers of CSE HTML Validator Professional.	0
9	impressivewebs.com - Impressive Webs, Toronto | Web Design Articles & Tutorials	0
10	en.wikipedia.org - Wikipedia, the free encyclopedia	0
11	w3schools.com - W3Schools Online Web Tutorials HTML XHTML CSS JavaScript XML XSL ASP SQL ADO VBScript Tutorials References Examples	0
12	css3.info - CSS3 . Info - All you ever needed to know about CSS3 CSS3	0
13	bryanhadaway.com - Bryan Hadaway's Web + Tech Blog	0
14	onlinewebcheck.com - OnlineWebCheck.com - CSE HTML Validator FREE Website Check	0
15	addons.mozilla.org - Add-ons for Firefox	0

I have no idea. Please, refresh tomorrow ;)

Site	Traffic	Engagement
w3.org	75.7%	0x
impressivewebs.com	4%	0x
cssportal.com	3.4%	0x
google.com	2.9%	0x
chrispederick.com	2.7%	0x
Other	11.3%	0x

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Twitter activity