They aggressively create separate pages for every element and attribute, each full of ads, but hardly any containing substantive descriptions of the things they document. At worst they just restate the name of the attribute in different words. And the examples, while sometimes nice, often just show the effect of turning a property on or off and don't really demonstrate the different things you can do with it. If they focused more on substance and less on SEO, they could be a much better resource.