Re: [whatwg/dom] Proposal: a DocumentFragment whose nodes do not get removed once inserted (#736)

robbiespeed left a comment (whatwg/dom#736)

@rniwa can you be more specific about what kinds of changes to parser behaviour is problematic? Template is a wildly different scenario, since it's children are placed into a `DocumentFragment` rather than as children of the element in the DOM tree (I see how that could've possibly lead to XSS with nonsupporting implementations). What's being proposed is something that from a parsing/DOM tree perspective behaves nearly identically to a regular element, with the difference being it may be placed in any parent element so long as it's children (or grand-children in a nested fragment case) are valid content of the fragments parent. The major change is with how the element behaves with CSS.

From a backwards compatibility scenario it would end up a `HTMLUnknownElement` without the special transparent CSS behaviour or placement rules (would be moved outside a table for example). That seems pretty low risk.

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