The <embed-page/> web component is acting as IFRAME. Its content is insulated on JS, DOM, CSS and browsing context level( A links and FORM get/post ).
Unlike IFRAME it is embedded inline into parent page DOM and automatically resizing parent node.
1. The header above should be intact(default) in color and text size.
2. Colors in demo components and IFRAMEs should match the page name: purple, violet.
1. Checkboxes on page should not be affected by embed-page content.
2. Operating the page content here should not affect the component` intestines.
1. Click on link will replace the component content with page from href attribute.
1. GET and POST will replace content according to FORM action attribute.