Re: [heycam/webidl] Add [Historical] extended attribute (#929)

@saschanaz commented on this pull request.



> @@ -9725,6 +9725,31 @@ corresponding to [=interface members=].
 </div>
 
 
+<h4 id="Historical" extended-attribute lt="Historical">[Historical]</h4>
+
+When the [{{Historical}}] [=extended attribute=] appears on an individual
+[=dictionary member=], [=interface member=], [=interface mixin member=], or
+[=namespace member=], it indicates that the construct exists for historical
+reason.
+
+The [{{Historical}}] extended attribute must
+[=takes no arguments|take no arguments=].
+
+<div class="example">
+    There are Web APIs that have been replaced by better new APIs and are
+    generally discouraged to use. Code editors can consider this extended
+    attribute as a hint to warn users where such APIs are used. Browser
+    implementations may also consider this as a suggestion to add use counters.

I added this as I thought Gecko already had use counters for them but it seems not. I'm okay without this.

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