[docs] update dart:html template files

Change-Id: I6084ba14a903945372b67f5e066ed6ed7d4e2969
CoreLibraryReviewExempt: doc only change
Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/345741
Commit-Queue: Devon Carew <devoncarew@google.com>
Reviewed-by: Kevin Moore <kevmoo@google.com>
diff --git a/sdk/lib/web_sql/dart2js/web_sql_dart2js.dart b/sdk/lib/web_sql/dart2js/web_sql_dart2js.dart
index 99d8dd3..f3f183e 100644
--- a/sdk/lib/web_sql/dart2js/web_sql_dart2js.dart
+++ b/sdk/lib/web_sql/dart2js/web_sql_dart2js.dart
@@ -7,7 +7,7 @@
 ///
 /// The [dart:indexed_db] APIs is a recommended alternatives.
 ///
-/// {@category Web}
+/// {@category Web (Legacy)}
 /// {@nodoc}
 library dart.dom.web_sql;
 
diff --git a/tools/dom/templates/html/dart2js/html_dart2js.darttemplate b/tools/dom/templates/html/dart2js/html_dart2js.darttemplate
index 435f1d4f..cd9a3e7 100644
--- a/tools/dom/templates/html/dart2js/html_dart2js.darttemplate
+++ b/tools/dom/templates/html/dart2js/html_dart2js.darttemplate
@@ -17,7 +17,7 @@
 ///
 /// For information on writing web apps with Dart, see https://dart.dev/web.
 ///
-/// {@category Web}
+/// {@category Web (Legacy)}
 /// {@canonicalFor dart:_internal.HttpStatus}
 library dart.dom.html;
 
diff --git a/tools/dom/templates/html/dart2js/indexed_db_dart2js.darttemplate b/tools/dom/templates/html/dart2js/indexed_db_dart2js.darttemplate
index 872157e..1db1d5e 100644
--- a/tools/dom/templates/html/dart2js/indexed_db_dart2js.darttemplate
+++ b/tools/dom/templates/html/dart2js/indexed_db_dart2js.darttemplate
@@ -69,7 +69,7 @@
 /// MDN provides [API
 /// documentation](https://developer.mozilla.org/en-US/docs/Web/API/IndexedDB_API).
 ///
-/// {@category Web}
+/// {@category Web (Legacy)}
 library dart.dom.indexed_db;
 
 import 'dart:async';
diff --git a/tools/dom/templates/html/dart2js/svg_dart2js.darttemplate b/tools/dom/templates/html/dart2js/svg_dart2js.darttemplate
index d2b73f9..f372480 100644
--- a/tools/dom/templates/html/dart2js/svg_dart2js.darttemplate
+++ b/tools/dom/templates/html/dart2js/svg_dart2js.darttemplate
@@ -9,7 +9,7 @@
 /// refer to the
 /// [Scalable Vector Graphics Specification](http://www.w3.org/TR/SVG/).
 ///
-/// {@category Web}
+/// {@category Web (Legacy)}
 library dart.dom.svg;
 
 import 'dart:async';
diff --git a/tools/dom/templates/html/dart2js/web_audio_dart2js.darttemplate b/tools/dom/templates/html/dart2js/web_audio_dart2js.darttemplate
index 32edc98..304ba57 100644
--- a/tools/dom/templates/html/dart2js/web_audio_dart2js.darttemplate
+++ b/tools/dom/templates/html/dart2js/web_audio_dart2js.darttemplate
@@ -4,7 +4,7 @@
 
 /// High-fidelity audio programming in the browser.
 ///
-/// {@category Web}
+/// {@category Web (Legacy)}
 library dart.dom.web_audio;
 
 import 'dart:async';
diff --git a/tools/dom/templates/html/dart2js/web_gl_dart2js.darttemplate b/tools/dom/templates/html/dart2js/web_gl_dart2js.darttemplate
index f861aa3..08d24ac 100644
--- a/tools/dom/templates/html/dart2js/web_gl_dart2js.darttemplate
+++ b/tools/dom/templates/html/dart2js/web_gl_dart2js.darttemplate
@@ -4,7 +4,7 @@
 
 /// 3D programming in the browser.
 ///
-/// {@category Web}
+/// {@category Web (Legacy)}
 library dart.dom.web_gl;
 
 import 'dart:async';
diff --git a/tools/dom/templates/html/dart2js/web_sql_dart2js.darttemplate b/tools/dom/templates/html/dart2js/web_sql_dart2js.darttemplate
index 0165619..fe117dc 100644
--- a/tools/dom/templates/html/dart2js/web_sql_dart2js.darttemplate
+++ b/tools/dom/templates/html/dart2js/web_sql_dart2js.darttemplate
@@ -11,7 +11,7 @@
 ///
 /// The [dart:indexed_db] APIs is a recommended alternatives.
 ///
-/// {@category Web}
+/// {@category Web (Legacy)}
 /// {@nodoc}
 @deprecated
 library dart.dom.web_sql;