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Changes between Initial Version and Version 1 of Ticket #47066, comment 4

initial	v1
1	1	I'm concerned about the potential for negative side effects this could have on sites.
2	2
3		Any site that targets `section#primary anythingelse {}` would see their theme break, and potentially severely because this is a high level element in the DOM.
	3	Any site that targets `section#primary anythingelse {}` or `section.content-area` would see their theme break, and potentially severely because this is a high level element in the DOM.
4	4
5	5	Any site that uses Twenty Nineteen and has any custom CSS defined either in a child theme that does not override all of these templates, or added through the Customizer could be effected.