https://bugzilla.wikimedia.org/show_bug.cgi?id=42667

--- Comment #1 from Gabriel Wicke <[email protected]> ---
>From http://dev.w3.org/html5/spec-preview/syntax.html#element-restrictions:

"A single newline may be placed immediately after the start tag of pre and
textarea elements. This does not affect the processing of the element. The
otherwise optional newline must be included if the element's contents
themselves start with a newline (because otherwise the leading newline in the
contents would be treated like the optional newline, and ignored)."

This is about the syntax, so applies to serializing and parsing. A serializer
must emit an additional newline if the pre content (without the optional
newline) in the DOM starts with a newline. Sadly, the innerHTML method in
modern browsers does not seem to implement this, so we have to work around it.

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