Mention Worklets in the introduction

And drop dated mention of offline caching.

Closes #6412.

source

@@ -471,91 +471,67 @@
   <p>This specification is divided into the following major sections:</p>
 
   <dl>
-
    <dt><a href="#introduction">Introduction</a></dt>
-
    <dd>Non-normative materials providing a context for the HTML standard.</dd>
 
-
    <dt><a href="#infrastructure">Common infrastructure</a></dt>
-
    <dd>The conformance classes, algorithms, definitions, and the common underpinnings of the rest of
    the specification.</dd>
 
-
    <dt><a href="#dom">Semantics, structure, and APIs of HTML documents</a></dt>
-
    <dd>Documents are built from elements. These elements form a tree using the DOM. This section
    defines the features of this DOM, as well as introducing the features common to all elements, and
    the concepts used in defining elements.</dd>
 
-
    <dt><a href="#semantics">The elements of HTML</a></dt>
-
    <dd>Each element has a predefined meaning, which is explained in this section. Rules for authors
    on how to use the element<span w-nodev>, along with user agent requirements for how to
    handle each element,</span> are also given. This includes large signature features of HTML such
    as video playback and subtitles, form controls and form submission, and a 2D graphics API known
    as the HTML canvas.</dd>
 
-
    <dt><a href="#microdata">Microdata</a></dt>
-
    <dd>This specification introduces a mechanism for adding machine-readable annotations to
    documents, so that tools can extract trees of name-value pairs from the document. This section
    describes this mechanism<span w-nodev> and some algorithms that can be used to convert HTML
    documents into other formats</span>. This section also defines some sample Microdata vocabularies
    for contact information, calendar events, and licensing works.</dd>
 
-
    <dt><a href="#editing">User interaction</a></dt>
-
    <dd>HTML documents can provide a number of mechanisms for users to interact with and modify
    content, which are described in this section, such as how focus works, and drag-and-drop.</dd>
 
-
    <dt><a href="#browsers">Loading web pages</a></dt>
-
    <dd>HTML documents do not exist in a vacuum &mdash; this section defines many of the features
-   that affect environments that deal with multiple pages, such as web browsers and offline
-   caching of web applications.</dd>
-
+   that affect environments that deal with multiple pages, such as web browsers.</dd>
 
    <dt><a href="#webappapis">Web application APIs</a></dt>
-
    <dd>This section introduces basic features for scripting of applications in HTML.</dd>
 
-
    <dt><a href="#workers">Web workers</a></dt>
-
    <dd>This section defines an API for background threads in JavaScript.</dd>
 
+   <dt><a href="#worklets">Worklets</a></dt>
+   <dd>This section defines infrastructure for APIs that need to run JavaScript separately from the
+   main JavaScript execution environment.</dd>
 
    <dt><a href="#comms">The communication APIs</a></dt>
-
    <dd>This section describes some mechanisms that applications written in HTML can use to
    communicate with other applications from different domains running on the same client. It also
    introduces a server-push event stream mechanism known as Server Sent Events or
    <code>EventSource</code>, and a two-way full-duplex socket protocol for scripts known as Web
-   Sockets.
-   </dd>
-
+   Sockets.</dd>
 
    <dt><a href="#webstorage">Web storage</a></dt>
-
    <dd>This section defines a client-side storage mechanism based on name-value pairs.</dd>
 
-
    <dt><a href="#syntax">The HTML syntax</a></dt>
    <dt><a href="#xhtml">The XML syntax</a></dt>
-
    <dd>All of these features would be for naught if they couldn't be represented in a serialized
    form and sent to other people, and so these sections define the syntaxes of HTML and XML<span
    w-nodev>, along with rules for how to parse content using those syntaxes</span>.</dd>
 
-
    <dt w-nodev><a href="#rendering">Rendering</a></dt>
-
    <dd w-nodev>This section defines the default rendering rules for web browsers.</dd>
   </dl>