I think this is a relatively recent regression. `\ ` at the start of a line 
normally gets treated as a space:

> pandoc
one

\ two

three
<p>one</p>
<p> two</p>
<p>three</p>

But if it's in a table, it gets preserved now. HTML below:

> pandoc
one | one
----|---
two | two
\   | three
<table>
<thead>
<tr class="header">
<th>one</th>
<th>one</th>
</tr>
</thead>
<tbody>
<tr class="odd">
<td>two</td>
<td>two</td>
</tr>
<tr class="even">
<td>\</td>
<td>three</td>
</tr>
</tbody>
</table>

Native output looks like this:

[Table [] [AlignDefault,AlignDefault] [0.0,0.0]
 [[Plain [Str "one"]]
 ,[Plain [Str "one"]]]
 [[[Plain [Str "two"]]
  ,[Plain [Str "two"]]]
 ,[[Plain [Str "\\"]]
  ,[Plain [Str "three"]]]]]

Versus this for the non-table version:

[Para [Str "one"]
,Para [Str "\160two"]
,Para [Str "three"]]


This has only started recently. I noticed it today in a document I last 
processed in October 2017.

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