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[Kristina Hoeppner <1992702@xxxxxxxxxxxxxxxxxx>]

** Summary changed:

- Allow a certain style attribute in HTMLPurifier for Canva iframe
+ Allow a certain style attribute in HTMLPurifier (for Canva iframe and others)

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https://bugs.launchpad.net/bugs/1992702

Title:
  Allow a certain style attribute in HTMLPurifier (for Canva iframe and
  others)

Status in Mahara:
  Fix Committed

Bug description:
  We have embed code generated by Canva
  However, Htmlpurifier removes 'style' attribute on iframe and hence the embed content is not displayed properly.

  I am looking to add 'style' as allowed attribute for iframe, but it may have some security implication, refer https://bugs.launchpad.net/mahara/+bug/1843154
   
  There is another option, that is using 'class', but it will require user to change the embed code.


  Example embed code
  <div style="position: relative; width: 100%; height: 0; padding-top: 56.2500%;
   padding-bottom: 0; box-shadow: 0 2px 8px 0 rgba(63,69,81,0.16); margin-top: 1.6em; margin-bottom: 0.9em; overflow: hidden;
   border-radius: 8px; will-change: transform;">
    <iframe loading="lazy" style="position: absolute; width: 100%; height: 100%; top: 0; left: 0; border: none; padding: 0;margin: 0;"
      src="https://sourceurl"; allowfullscreen="allowfullscreen" allow="fullscreen">
    </iframe>
  </div>

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