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+Tokenizer tests
+===============
+
+The test format is [JSON](http://www.json.org/). This has the advantage
+that the syntax allows backward-compatible extensions to the tests and
+the disadvantage that it is relatively verbose.
+
+Basic Structure
+---------------
+
+    {"tests": [
+        {"description": "Test description",
+        "input": "input_string",
+        "output": [expected_output_tokens],
+        "initialStates": [initial_states],
+        "lastStartTag": last_start_tag,
+        "errors": [parse_errors]
+        }
+    ]}
+
+Multiple tests per file are allowed simply by adding more objects to the
+"tests" list.
+
+Each parse error is an object that contains error `code` and one-based
+error location indices: `line` and `col`.
+
+`description`, `input` and `output` are always present. The other values
+are optional.
+
+### Test set-up
+
+`test.input` is a string containing the characters to pass to the
+tokenizer. Specifically, it represents the characters of the **input
+stream**, and so implementations are expected to perform the processing
+described in the spec's **Preprocessing the input stream** section
+before feeding the result to the tokenizer.
+
+If `test.doubleEscaped` is present and `true`, then `test.input` is not
+quite as described above. Instead, it must first be subjected to another
+round of unescaping (i.e., in addition to any unescaping involved in the
+JSON import), and the result of *that* represents the characters of the
+input stream. Currently, the only unescaping required by this option is
+to convert each sequence of the form \\uHHHH (where H is a hex digit)
+into the corresponding Unicode code point. (Note that this option also
+affects the interpretation of `test.output`.)
+
+`test.initialStates` is a list of strings, each being the name of a
+tokenizer state which can be one of the following:
+
+-   `Data state`
+-   `PLAINTEXT state`
+-   `RCDATA state`
+-   `RAWTEXT state`
+-   `Script data state`
+-   `CDATA section state`
+
+ The test should be run once for each string, using it
+to set the tokenizer's initial state for that run. If
+`test.initialStates` is omitted, it defaults to `["Data state"]`.
+
+`test.lastStartTag` is a lowercase string that should be used as "the
+tag name of the last start tag to have been emitted from this
+tokenizer", referenced in the spec's definition of **appropriate end tag
+token**. If it is omitted, it is treated as if "no start tag has been
+emitted from this tokenizer".
+
+### Test results
+
+`test.output` is a list of tokens, ordered with the first produced by
+the tokenizer the first (leftmost) in the list. The list must mach the
+**complete** list of tokens that the tokenizer should produce. Valid
+tokens are:
+
+    ["DOCTYPE", name, public_id, system_id, correctness]
+    ["StartTag", name, {attributes}*, true*]
+    ["StartTag", name, {attributes}]
+    ["EndTag", name]
+    ["Comment", data]
+    ["Character", data]
+
+`public_id` and `system_id` are either strings or `null`. `correctness`
+is either `true` or `false`; `true` corresponds to the force-quirks flag
+being false, and vice-versa.
+
+When the self-closing flag is set, the `StartTag` array has `true` as
+its fourth entry. When the flag is not set, the array has only three
+entries for backwards compatibility.
+
+All adjacent character tokens are coalesced into a single
+`["Character", data]` token.
+
+If `test.doubleEscaped` is present and `true`, then every string within
+`test.output` must be further unescaped (as described above) before
+comparing with the tokenizer's output.
+
+xmlViolation tests
+------------------
+
+`tokenizer/xmlViolation.test` differs from the above in a couple of
+ways:
+
+-   The name of the single member of the top-level JSON object is
+    "xmlViolationTests" instead of "tests".
+-   Each test's expected output assumes that implementation is applying
+    the tweaks given in the spec's "Coercing an HTML DOM into an
+    infoset" section.
+