feat: [FC-0070] add events and style for rendering Split xblock in chromeless template

[ihor-romaniuk]

🚨 Dependencies:

• 🔗 frontend-app-authoring
• 🔗 edx-platform

Description

This feature introduces functionalities to improve XBlock interactions within iframes:

• Add styles that adopt default styles for Split Test which renders chromless template via iframe in MFE Authoring.
• When the isIframeEmbed option is enabled, the XBlock sends a postMessage to the parent window. When sending such a message, the standard link transition is cancelled and the transition is carried out in MFE Authoring.

Unit_Split_Test.mov

Related Pull Requests

• feat: [FC-0070] rendering split test content in unit page frontend-app-authoring#1492 - rendering split test in unit page

Testing instructions

• Create a new course.
• Create several units.
• Open the course unit page.
• Add a Content Experiment xBlock to the unit.
• Click the “View” button on the Content Experiment xBlock.

[openedx-webhooks]

Thanks for the pull request, @ihor-romaniuk!

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