Position	Website	Change	Thumbnail
1	validator.w3.org - The W3C Markup Validation Service W3C	0
2	en.wikipedia.org - Wikipedia, the free encyclopedia	1
3	w3schools.com - W3Schools Online Web Tutorials HTML XHTML CSS JavaScript XML XSL ASP SQL ADO VBScript Tutorials References Examples	1
4	tools4noobs.com - Tools 4 noobs - tools you didn't even know you needed	1
5	xhtml.com - XHTML Reference An XHTML reference focused on best practices, plus articles and tutorials on CSS, XML, Web standards and accessibility.	1
6	tantek.com - tantek.com	3
7	totalvalidator.com - HTML / HTML5 / XHTML / WCAG / Section 508 / Links / Spelling Total Validator is an (X)HTML validator, an accessibility validator, a spell checker, and a broken links checker all rolled into one tool allowing one...	0
8	webstandards.org - The Web Standards Project The Web Standards Project is a grassroots coalition fighting for standards which ensure simple, affordable access to web technologies for all.	7
9	htmlhelp.com - HTML Help by The Web Design Group HTMLHelp.com is maintained by the Web Design Group to provide Web authoring reference material, tips, and answers to frequently asked questions.	23
10	stackoverflow.com - Stack Overflow	1
11	paul-m-jones.com - Paul M. Jones | It's not enough to be smart; you have to actually know things.	6
12	venturas.org - Welcome | Venturas.org	4
13	alistapart.com - A List Apart	-1

I have no idea. Please, refresh tomorrow ;)

Site	Traffic	Engagement
w3.org	76.1%	1.1x
wikipedia.org	6%	0x
w3schools.com	4.1%	0x
validome.org	2.9%	0x
tools4noobs.com	2.8%	0x
Other	8.1%	0x

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