Specs: Dartification or various odds and ends

sky/specs/markup.md

 Sky Markup: Syntax
 ==================
 
 A Sky file must consist of the following components:
 
  1. If the file is intended to be a top-level Sky application, the
     string "``#!mojo mojo:sky``" followed by a U+0020, U+000A or
     U+000D character.
 
     If the file is intended to be a module, then the string "SKY", a
@@ skipping 147 matching lines @@
 ``<import src="foo.sky" as="foo">``
  - Downloads and imports foo.sky in the background, using "foo" as its
    local name (see ``<script>``).
 
 ``<template>``
  - The contents of the element aren't placed in the Element itself.
    They are instead placed into a DocumentFragment that you can obtain
    from the element's "content" attribute.
 
 ``<script>``
- - Blocks until all previous imports have been loaded, then runs the
-   script, with 'module' as the first argument, the exports of any
-   imports that have "as" attributes at this time passed in as
-   subsequent arguments, and with "this" set to null.
+ - Blocks until all previous imports have been loaded, then loads the
+   library given in the script block, as described in
+   [scripts.md](scripts.md).
 
 ``<style>``
  - Adds the contents to the document's styles.
 
 ``<content>``
 ``<content select="...">``
  - In a shadow tree, acts as an insertion point for distributed nodes.
    The select="" attribute gives the selector to use to pick the nodes
    to place in this insertion point; it defaults to everything.
 
@@ skipping 19 matching lines @@
 ``<a href="foo.bin">``
  - A widget that, when invoked, causes mojo to open a new application
    for "foo.bin".
 
 ``<title>``
  - Sets the contents as the document's title (as provided by Sky to
    the view manager). (Actually just ensures that any time the element
    is mutated, theTitleElement.ownerScope.ownerDocument.title is set
    to the element's contents.)
 
-``<error>``
- - Represents a parse error.
-
 
 Sky Markup: Global Attributes
 =============================
 
 The following attributes are available on all elements:
 
 * ``id=""`` (any value)
 * ``class=""`` (any value, space-separated)
 * ``style=""`` (declaration part of a Sky style rule)
 * ``lang=""`` (language code)
 * ``dir=""`` (ltr or rtl only)
 * ``contenteditable=""`` (subject to future developments)
 * ``tabindex=""`` (subject to future developments)