>>> hard line break in a paragraph, using backslash
First line.\
Second line.

<<<
<p>First line.<br />
Second line.</p>
>>> within emphasis, using backslash
*Emphasised\
text.*

<<<
<p><em>Emphasised<br />
text.</em></p>
>>> no escape within code, using backslash
`Some\
code`.

<<<
<p><code>Some\
code</code>.</p>
>>> hard line break in a paragraph, using trailing spaces
First line.  
Second line.

<<<
<p>First line.<br />
Second line.</p>
>>> within emphasis, using trailing spaces
*Emphasised  
text.*

<<<
<p><em>Emphasised<br />
text.</em></p>
>>> no escape within code, using trailing spaces
`Some  
code`.

<<<
<p><code>Some  
code</code>.</p>