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I'm checking /wp-includes/media-template.php and just found this:

<# if ( data.compat && data.compat.meta ) { #>
    {{{ data.compat.meta }}}
<# } #>

Never seen <# #> or {{{ }}} before. What kind of PHP is this?
Searching for this symbols in Google seems futile...

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Those are javascript templates that get compiled into HTML by a javascript library. I think WP uses underscore.js.

Let's say you write a jQuery plugin, and you have to append HTML code to the document. Using such templates you can avoid stuffing that HTML code inside huge concatenated strings within your javascript code, and put it where the other HTML markup is. So you load that template from your plugin, compile it (variables get replaced) and append the resulting HTML to your document. Essentially you separate the business logic from the presentation logic. This also makes your plugin more decoupled.

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  • Oh, sure, those blocks are inside the Html, bad title for the Q then... Deep stuff the core team got to make the new Media Library.
    – brasofilo
    Commented Dec 14, 2012 at 2:12
  • Just saw the update, seems that those doesn't pop up in the notification system. Nice addition :) And thx @toscho too for the good title.
    – brasofilo
    Commented Dec 14, 2012 at 23:10

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