Re: [w3c/editing] [beforeinput] PreventDefault() on InputType=cut differs from Clipboard API (#144)

One example: I create an editor where I added a lot of custom tags and attributes to my content that are there only for internal purposes. Also, I have a datamodel that holds the content of the document I am working on. 

The user cuts, and I want to make sure that:

*  The part that was selected is being removed both from the DOM and from the datamodel. The order will need to be: remove from datamodel -> rerender document in the DOM.
* For the case that the user pastes the cut content somewhere else on the web, I want the global clipboard to contain HTML similar to what was selected, but I want my custom attributes and tags removed from the version that goes into the global clipboard.
* For the case that the user pastes the cut content back into my webapp, I need to copy the selected text as it is represented in my datamodel internally so that I can use this internal copy which holds additional data beyond what is available in the DOM.

Does that make sense?

I guess I can simply use the cut event for all of that. But what is then the point of the beforeinput event? Or I could use the beforeinput event, but if we choose your model A or C, then I will have a ahrd time getting content into the global clipboard, right?

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