embed-page demo - SCRIPT tag, currentScript and rootNode

As html container, embed-page reads and executes content of SCRIPT tag, and since its content is a subject of scope insulation, the rootNode, currentScript and other related "web page" scoped API should be scoped to content of embed-page.

script type="module" meant to be run only once like with will be run within each embed-page container. Within same container those will not be executed multiple times. But for each container the script will be executed separately. Script titled Y is executed and Z would be ignored.

script type="module" does not have document.currentScript set under current standard. Unlike in standard generic page, microapplication assumes minimal reuse of scripts and it is a convenience feature to use module-formatted script as embedding-aware one. I.e. it could serve only element it is embedded into.
The Y and Z titled scripts would behave differently in generic page and within embed-page.

API

• script src and embedded load is covered by main demo page, a coverage for core embed-page functionality.
• script type="module" loaded only once per embed-page.
• document.currentScipt - the way to access parameters for script from calling page.
• document.currentScipt.getRootNode() - the way to access current scope. It is a shortcut of traversing up the dom tree to find top or content root.
• document.currentScipt.rootNode - legacy replaced by getRootNode()
• script type=module
• document.getRootNode() returns EPA document
• document.rootElement returns EPA document
• document.elementFromPoint() and document.elementsFromPoint() returns EPA document https://developer.mozilla.org/en-US/docs/Web/API/DocumentOrShadowRoot/elementsFromPoint https://developer.mozilla.org/en-US/docs/Web/API/DocumentOrShadowRoot/elementFromPoint
• Document.documentElement

script type="module" loaded only once per embed-page