Test A: newline inside span. No collapsible whitespace. block is white-space: pre

Test B: newline inside span. No collapsible whitespace. span is white-space: pre

Test C: newline inside span following collapsible whitespace. span is white-space: pre

Test D: span following collapsible whitespace, duplicating BR definition from HTML5

Test E: span following collapsible whitespace, duplicating BR definition from https://github.com/w3c/csswg-drafts/issues/610

Test F: br following collapsible whitespace

Test G: br styling is very persistent