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How do I get a list of all CSS and JS that are attached to a page?

In Drupal 8, how do I get all CSS and JS that is attached to a page? In Drupal 7, I could use drupal_add_css() or drupal_add_js() without arguments, to get an array containing a list of all the files/inline added to a page.

I’m developing a module that will display a “preview” of the block on block configuration page. The method I chose is displaying the block code in a <iframe>, but to be properly styled, I need to output all styles with it. This is why I want to read all possible CSS/JS in this “preview” page controller.

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How do I get a list of all CSS and JS that are attached to a page?

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