Shorten abstract and remove historical discussions

Closes #1035.

index.bs

@@ -3,18 +3,8 @@ Group: WHATWG
 H1: Web IDL
 Shortname: webidl
 Text Macro: TWITTER webidl
-Abstract: This document defines an interface definition language, Web IDL,
-Abstract: that can be used to describe interfaces that are intended to be
-Abstract: implemented in web browsers. Web IDL is an IDL variant with a number
-Abstract: of features that allow the behavior of common script objects in
-Abstract: the web platform to be specified more readily. How interfaces
-Abstract: described with Web IDL correspond to constructs within ECMAScript
-Abstract: execution environments is also detailed in this document.
-Abstract: It is expected that this document acts
-Abstract: as a guide to implementors of already-published specifications,
-Abstract: and that newly published specifications reference this
-Abstract: document to ensure conforming implementations of interfaces
-Abstract: are interoperable.
+Abstract: This standard defines an interface definition language, Web IDL, that can be used to describe interfaces that
+Abstract: are intended to be implemented in web browsers.
 Translation: ja https://triple-underscore.github.io/WebIDL-ja.html
 Complain About: accidental-2119 no
 </pre>
@@ -377,28 +367,17 @@ urlPrefix: https://tc39.es/proposal-resizablearraybuffer/; spec: RESIZABLE-BUFFE
 
 <i>This section is informative.</i>
 
-Technical reports published by the W3C that include programming
-language interfaces have typically been described using the
-Object Management Group’s Interface Definition Language (IDL)
-[[OMGIDL]].  The IDL provides a means to
-describe these interfaces in a language independent manner.  Usually,
-additional language binding appendices are included in such
-documents which detail how the interfaces described with the IDL
-correspond to constructs in the given language.
-
-However, the bindings in these specifications for the language most
-commonly used on the web, ECMAScript, are consistently specified with
-low enough precision as to result in interoperability issues.  In
-addition, each specification must describe the same basic information,
-such as DOM interfaces described in IDL corresponding to properties
-on the ECMAScript global object, or the {{unsigned long}} IDL type mapping to the Number
-type in ECMAScript.
-
-This specification defines an IDL language similar to OMG IDL
-for use by specifications that define interfaces for Web APIs.  A number of extensions are
-given to the IDL to support common functionality that previously must
-have been written in prose.  In addition, precise language bindings
-for the ECMAScript language are given.
+This standard defines an interface definition language, Web IDL, that can be used to describe
+interfaces that are intended to be implemented in web browsers. Web IDL is an IDL variant with a
+number of features that allow the behavior of common script objects in the web platform to be
+specified more readily. How interfaces described with Web IDL correspond to constructs within
+ECMAScript execution environments is also detailed here.
+
+Concretely, Web IDL provides a syntax for specifying the surface APIs of web platform objects, as
+well as ECMAScript bindings that detail how those APIs manifest as ECMAScript constructs. This
+ensures common tasks, such as installing global properties, processing numeric inputs, or exposing
+iteration behavior, remain uniform across web platform specifications: such specifications describe
+their interfaces using Web IDL, and then use prose to specify API-specific details.
 
 
 <h2 id="idl">Interface definition language</h2>
@@ -6042,12 +6021,6 @@ The {{DOMString}} type corresponds to
 the set of all possible sequences of [=code units=].
 Such sequences are commonly interpreted as UTF-16 encoded strings [[!RFC2781]]
 although this is not required.
-While {{DOMString}} is defined to be
-an OMG IDL boxed [=sequence type|sequence=]&lt;{{unsigned short}}&gt; valuetype
-in [[DOM-LEVEL-3-CORE/core#ID-C74D1578|DOM Level 3 Core §The DOMString Type]],
-this document defines {{DOMString}} to be an intrinsic type
-so as to avoid special casing that sequence type
-in various situations where a string is required.
 
 Note: Note also that <emu-val>null</emu-val>
 is not a value of type {{DOMString}}.