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I'm looking to apply specific themes to individual items on a page - a different theme to the rest of the page.

I realise this seems quite obscure, but the general premise is similar to a styleguide.

A themed page/site which describes the behaviour of a paragraph/block, with a rendered version of the paragraph/block, using a second theme - from a site where it's previously been used.

I know there are ways to set a theme per page (ThemeNegotiator) but I'm at a loss for where to begin with a component…

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    Conceptually that doesn't really make sense (in terms of Drupal's theme system I mean). I'd be surprised if you find anything that allows you to arbitrarily switch themes in the middle of a render pipeline. How are you planning to manage the inevitable CSS craziness when the styles from one theme are overriding the styles from another in an unpredictable way, for example?
    – Clive
    Nov 15, 2018 at 12:35
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    It feels like you'd be better off creating separate pages for these components, using the theme negotiator to swap the theme for those pages, exclude the headers/footers (just render the content), and iframe them into the other page
    – Clive
    Nov 15, 2018 at 12:39
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    Doesn’t really make sense outside of either iframing or providing CSS sheets per paragraph
    – Kevin
    Nov 15, 2018 at 12:52
  • I think you should think broader in your implementation. The goal, it seems, is to have a wildly different look based on a particular piece of content. I think that CSS does this natively with its selectors so a different, but related question might be how to apply different (dynamic? static?) selectors to your paragraph blocks so that a different look and feel can be applied to those. You can also add in an arbitrary library (css/js) for a given render array so that would help style it. And there is the styleguide module if you're looking for a styleguide.
    – mradcliffe
    Nov 15, 2018 at 14:59
  • Thanks for you thoughts guys, you've raised all the concerns I had. The idea of attaching a library (as per @mradcliffe) crossed my mind, but there would be the same issue of "inevitable CSS craziness" as @clive so nicely puts it. Nov 15, 2018 at 16:17

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