This is raised by pcurren on behalf of grahan01 from this comment.

See the attached video. To summarise create the following structure in Chrome -

<p>para 1</p>
<p>para 2<br>line 2 of para 2</p>

Then try and backspace from the start of "para 2".

The result is this structure -

<p>para 1para2</p>
<p>line 2 of para 2</p>

You would instead expect this -

<p>para 1para2<br>
line 2 of para 2</p>

Which is what you get in browsers other than Chrome/Safari.