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I wrote a custom block and am trying to better understand the interplay of the JavaScript and PHP on both front and back end regarding blocks.

Say I have some block that I want rendered dynamically. That leads to questions:

  1. For dynamic blocks I take it we have to guarantee that the attributes are in the JSON in the comments delimiter?
  2. On front end, is there any reason to have the block comments displayed? Should we always use a filter when displaying posts to remove the block comments, or are these attributes someone used by client side javascript?
  3. Endpoints: Here is where I am really confused. For dynamic block rendering we are supposed to specify a PHP callback. Is that to be called by a restAPI endpoint (in which case do we have to set show_in_rest to true for dynamic blocks?) or is there a separate mechanism?

Just looking for some clarification on these points.

thanks

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