What is wp:group align layout type

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What does wp:group align layout type style do? I have been trying to google and understand this stuff but can't seem to find any resources explaining all this. Why when there is already an align wide in the comments, we need to add a alignwide class below? Where is the has-background class defined? is it a WP internal class? but where is this stuff mentioned in the WP documentation?

https://i.redd.it/dmeedgpli5rd1.gif

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