What I like about this article is that it offers a simple challenge anyone can access but combines it with a degree of complexity that challenges almost anyone interested in the web. The source code is easily viewable (and they show it so you don't have to go look) and the commands are ordinary HTML commands found at the top of just about every web page. Ah - but what do they mean? You might know, for example, that 'og' stands for 'open Graph', a format created by Facebook years ago to facilitate little website cards. But what do the elements in the tag mean? How are they used today?
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