Suggest a rootMargin strategy for lazy-loaded elements
Prevent attachInternals() use before custom element constructor
Add a note about limiting the image density srcset takes into account
Add width and height attributes to source elements
Make beforeunload not affect 'salvageable' & fire unload event only if document is no longer salvageable
Allow user agent to unload nested browsing contexts
Editorial: align with Encoding's changes to "streams" / "I/O queues"
Reference even more baseline concepts in CSS Inline Layout
WIP: Allow for the possibility of user agents implementing landmark navigation
registerProtocolHandler(): creating a navigable URL cannot fail
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