RFC: What is expected when a root editable element's contents are completely removed via execCommand

Simple test case:

1. Load data:text/html,<div contenteditable>foo</div>
2. Give focus to the editable div
3. Press Ctrl+A (or use selectAll execCommand)
4. Press Del (or use delete execCommand)

Chromium results: <div contenteditable></div>
Gecko results: <div contenteditable><br></div>

Which of the above is correct and why?

I was hoping to find the answer in https://w3c.github.io/editing/docs/execCommand/#deleting-the-selection, but I'm not seeing it. Granted, that's a very long algorithm and I have an admittedly short attention span. 😇 Could a statement be added near the top or at the bottom that specifies when a br placeholder should and should not be present as a result of using the delete execCommand?

As for why I'm interested: I am trying to fix a number of issues in Chromium's contenteditable support. I have a local bug fix which breaks a bunch of Chromium (née WebKit) tests because now a br is present whereas before it was not. Using selectAll + delete is one such example. Should I be figuring out how to remove those brs which result from my change, or updating the test expectations to reflect corrected behavior?