I've been writing about all things front end web development on CSS-Tricks for over 7 years.
This is an advertorial, the advertiser provides the content that the publisher will share with their audience.
In addition to having a post published to the website, the sponsorship also goes out to the RSS feed. I can publish the post at some point Monday, Tuesday, Wednesday, or Thursday (usually Thursday). Best to do it on a day when it's the only post, and I typically only post 3 times a week. It is also tweeted by @real_css_tricks, with hundreds of thousands of followers and goes out to the Facebook group as well.