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+Tree Construction Tests
+=======================
+
+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 must begin with a string "\#data" followed by a newline (LF).
+All subsequent lines until a line that says "\#errors" are the test data
+and must be passed to the system being tested unchanged, except with the
+final newline (on the last line) removed.
+
+Then there must be a line that says "\#errors". It must be followed by
+one line per parse error that a conformant checker would return. It
+doesn't matter what those lines are, although they can't be
+"\#document-fragment", "\#document", "\#script-off", "\#script-on", or
+empty, the only thing that matters is that there be the right number
+of parse errors.
+
+Then there \*may\* be a line that says "\#document-fragment", which must
+be followed by a newline (LF), followed by a string of characters that
+indicates the context element, followed by a newline (LF). If the string 
+of characters starts with "svg ", the context element is in the SVG
+namespace and the substring after "svg " is the local name. If the
+string of characters starts with "math ", the context element is in the
+MathML namespace and the substring after "math " is the local name.
+Otherwise, the context element is in the HTML namespace and the string
+is the local name. If this line is present the "\#data" must be parsed
+using the HTML fragment parsing algorithm with the context element as
+context.
+
+Then there \*may\* be a line that says "\#script-off" or
+"\#script-in". If a line that says "\#script-off" is present, the
+parser must set the scripting flag to disabled. If a line that says
+"\#script-on" is present, it must set it to enabled. Otherwise, the
+test should be run in both modes.
+
+Then there must be a line that says "\#document", which must be followed
+by a dump of the tree of the parsed DOM. Each node must be represented
+by a single line. Each line must start with "| ", followed by two spaces
+per parent node that the node has before the root document node.
+
+-   Element nodes must be represented by a "`<`" then the *tag name
+    string* "`>`", and all the attributes must be given, sorted
+    lexicographically by UTF-16 code unit according to their *attribute
+    name string*, on subsequent lines, as if they were children of the
+    element node.
+-   Attribute nodes must have the *attribute name string*, then an "="
+    sign, then the attribute value in double quotes (").
+-   Text nodes must be the string, in double quotes. Newlines aren't
+    escaped.
+-   Comments must be "`<`" then "`!-- `" then the data then "` -->`".
+-   DOCTYPEs must be "`<!DOCTYPE `" then the name then if either of the
+    system id or public id is non-empty a space, public id in
+    double-quotes, another space an the system id in double-quotes, and
+    then in any case "`>`".
+-   Processing instructions must be "`<?`", then the target, then a
+    space, then the data and then "`>`". (The HTML parser cannot emit
+    processing instructions, but scripts can, and the WebVTT to DOM
+    rules can emit them.)
+-   Template contents are represented by the string "content" with the
+    children below it.
+
+The *tag name string* is the local name prefixed by a namespace
+designator. For the HTML namespace, the namespace designator is the
+empty string, i.e. there's no prefix. For the SVG namespace, the
+namespace designator is "svg ". For the MathML namespace, the namespace
+designator is "math ".
+
+The *attribute name string* is the local name prefixed by a namespace
+designator. For no namespace, the namespace designator is the empty
+string, i.e. there's no prefix. For the XLink namespace, the namespace
+designator is "xlink ". For the XML namespace, the namespace designator
+is "xml ". For the XMLNS namespace, the namespace designator is "xmlns
+". Note the difference between "xlink:href" which is an attribute in no
+namespace with the local name "xlink:href" and "xlink href" which is an
+attribute in the xlink namespace with the local name "href".
+
+If there is also a "\#document-fragment" the bit following "\#document"
+must be a representation of the HTML fragment serialization for the
+context element given by "\#document-fragment".
+
+For example:
+
+    #data
+    <p>One<p>Two
+    #errors
+    3: Missing document type declaration
+    #document
+    | <html>
+    |   <head>
+    |   <body>
+    |     <p>
+    |       "One"
+    |     <p>
+    |       "Two"