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	developer.mozilla.org - Mozilla Developer Network	0
5	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
6	css-tricks.com - CSS-Tricks	0
7	stackoverflow.com - Stack Overflow	0
8	quirksmode.org - QuirksMode - for all your browser quirks	0
9	htmldog.com - HTML and CSS Tutorials, References, and Articles | HTML Dog	0
10	github.com - Secure source code hosting and collaborative development - GitHub	0
11	w3schools.com - W3Schools Online Web Tutorials HTML XHTML CSS JavaScript XML XSL ASP SQL ADO VBScript Tutorials References Examples	0
12	davidwalsh.name - MooTools Consultant, jQuery Consultant - David Walsh A Programmer	0
13	wordpress.org - WordPress › Blog Tool and Publishing Platform	0
14	themeforest.net - Premium WordPress Themes and Web Templates - ThemeForest Buy Website Templates and WordPress Themes from ThemeForest - the largest marketplace of its kind for Site Templates and CMS Themes.	0
15	en.wikipedia.org - Wikipedia, the free encyclopedia	0

I have no idea. Please, refresh tomorrow ;)

Site	Traffic	Engagement
w3.org	78.7%	0.8x
mozilla.org	4.7%	0x
meiert.com	2.8%	0x
wordpress.org	2.8%	0x
cssportal.com	2.7%	0x
Other	8.3%	0x

Top Advertisers for valid css

Site
altova.com

Warning: file_put_contents(): Only 0 of 10 bytes written, possibly out of free disk space in /srv/shutkeys/application/modules/default/views/helpers/Twittweb.php on line 25

Warning: file_put_contents(): Only 0 of 10 bytes written, possibly out of free disk space in /srv/shutkeys/application/modules/default/views/helpers/Twittweb.php on line 27

Twitter activity