This test ensures WebKit avoids cloning Apple tab span when inserting a paragraph separator.
Only tab should be inside a Apple tab span in the following tests.
last visible position:
| <span>
| style="white-space:pre"
| " "
| <div>
| "hello world WebKit <#selection-caret>"
first visible position:
| <div>
| <br>
| "hello world WebKit <#selection-caret>"
| <span>
| style="white-space:pre"
| " "
before tab span:
| "hi, "
| <div>
| "hello world WebKit <#selection-caret>"
| <span>
| style="white-space:pre"
| " "
| " rocks"
after tab span:
| "hi, "
| <span>
| style="white-space:pre"
| " "
| <div>
| "hello world WebKit <#selection-caret>rocks"