HTML DOM serialization tests
============================
The format of these tests is essentially the format of html5lib's tree
construction tests in reverse. There are, however, important differences,
so the format is documented in full here.
Each file containing tree construction tests consists of any number of
tests separated by two newlines (LF) and a single newline before the end
of the file. For instance:
[TEST]LF
LF
[TEST]LF
LF
[TEST]LF
Where [TEST] is the following format:
Each test begins with a line reading `#document` or `#fragment`; subsequent
lines represent the document or document fragment (respectively) used as
input, until a line is encountered which reads `#output`, `#script-on`,
or `#script-off`.
Each DOM node in the input is written on its own line beginning with the
characters "| " (a vertical bar followed by a single space); lines which begin
with other characters are a continuation of the previous line. Attributes
are treated as distinct nodes and have their own entries. There is no escape
mechanism: all input is literal, including newlines and quotation marks. Two
spaces are used to denote each level of nesting. For example:
| node
| child node
continuation of child node
| grandchild node
| child node
| attribute node of child
| grandchild node
The different types of nodes are:
- Element nodes in the form `` for an element in the HTML namespace,
or `