Parsoid/Normalizations

While serializing (html2wt), Parsoid performs a number of normalizations, some behind a  flag.

Most can be found in wts.normalizeDOM.js

Default
These are the normalizations that Parsoid performs by default.
 * Tag minimization ( / tags)
 * Force category links and behaviour switches to serialize before/after headings (only performed on new nodes)
 * Serialize invalid  tags to text
 * Enforce single-line context (in headings and lists)

scrubWikitext
These normalization can be enabled by passing the  parameter to the API.
 * Strip empty headings and style tags (only performed on new nodes)
 * Tag minimization ( tags, when at least one is new)
 * Whitespace at the start of paragraphs

Tag minimization ( / tags)
and

Force category links and behaviour switches to serialize before/after headings
and

Serialize invalid  tags to text
and

Enforce single-line context
and

However, newlines in transclusion parameters are preserved.

Strip empty headings and style tags
Normally, but with scrubbing it's all dropped.

Whitespace at the start of paragraphs
These nowikis are to prevent roundtripping as preformatted text.