Streaming sanitizer (depends on 12624)#12645
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Instead of inserting elements to a fake root element of a connected inert document and then appending them to a `DocumentFragment`, we let the parser insert the root's children straight into that `DocumentFragment`. This is done by having an "adjusted insertion target" that the parser uses to route insertions desined to the root of the stack directly into the fragment. The observable behavior change is in subtle places that check for connectedness when insertion, like radio buttons. This is also creates an enabler that can be used later on for HTML streaming, as the "adjusted insertion target" can be the context element instead of the intermediate fragment. Note that we still need some notion of the intermediate inert document, to avoid creation time side effects like image loading and custom element constructors to occur before sanitization. (This resembles blink implementation, more than the current wording) Closes #11023
This reverts commit 3b8d929.
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/document-lifecycle.html ( diff )
/dynamic-markup-insertion.html ( diff )
/parsing.html ( diff )
/xhtml.html ( diff )