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   <link href="https://www.w3.org/StyleSheets/TR/2021/cg-draft" rel="stylesheet">
   <meta content="Bikeshed version 82ce88815, updated Thu Sep 7 16:33:55 2023 -0700" name="generator">
   <link href="https://wicg.github.io/observable/" rel="canonical">
-  <meta content="35b0376f587155f01696e5f3aa33c55d1fa86772" name="document-revision">
+  <meta content="29fabd5fa3a121dc14d1bffe40f563eac18b9387" name="document-revision">
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@@ -901,7 +901,7 @@
   <div class="head">
    <p data-fill-with="logo"><a class="logo" href="https://www.w3.org/"> <img alt="W3C" height="48" src="https://www.w3.org/StyleSheets/TR/2021/logos/W3C" width="72"> </a> </p>
    <h1 class="p-name no-ref" id="title">Observable</h1>
-   <p id="w3c-state"><a href="https://www.w3.org/standards/types#CG-DRAFT">Draft Community Group Report</a>, <time class="dt-updated" datetime="2024-02-07">7 February 2024</time></p>
+   <p id="w3c-state"><a href="https://www.w3.org/standards/types#CG-DRAFT">Draft Community Group Report</a>, <time class="dt-updated" datetime="2024-02-08">8 February 2024</time></p>
    <div data-fill-with="spec-metadata">
     <dl>
      <dt>This version:
@@ -1432,7 +1432,47 @@ <h4 class="heading settled" data-level="2.3.2" id="observable-returning-operator
      The <dfn class="dfn-paneled idl-code" data-dfn-for="Observable" data-dfn-type="method" data-export id="dom-observable-map"><code>map(<var>mapper</var>)</code></dfn> method steps are: 
     <ol>
      <li data-md>
-      <p><span class="XXX">TODO: Spec this and use <var>mapper</var>.</span></p>
+      <p>Let <var>sourceObservable</var> be <a data-link-type="dfn" href="https://webidl.spec.whatwg.org/#this" id="ref-for-this②②">this</a>.</p>
+     <li data-md>
+      <p>Let <var>observable</var> be a <a data-link-type="dfn" href="https://webidl.spec.whatwg.org/#new" id="ref-for-new③">new</a> <code class="idl"><a data-link-type="idl" href="#observable" id="ref-for-observable②②">Observable</a></code> whose <a data-link-type="dfn" href="#observable-subscribe-callback" id="ref-for-observable-subscribe-callback⑥">subscribe callback</a> is an
+ algorithm that takes a <code class="idl"><a data-link-type="idl" href="#subscriber" id="ref-for-subscriber①⑤">Subscriber</a></code> <var>subscriber</var> and does the following:</p>
+      <ol>
+       <li data-md>
+        <p>Let <var>controller</var> be a <a data-link-type="dfn" href="https://webidl.spec.whatwg.org/#new" id="ref-for-new④">new</a> <code class="idl"><a data-link-type="idl" href="https://dom.spec.whatwg.org/#abortcontroller" id="ref-for-abortcontroller②">AbortController</a></code>.</p>
+       <li data-md>
+        <p>Let <var>idx</var> be an <code class="idl"><a data-link-type="idl" href="https://webidl.spec.whatwg.org/#idl-unsigned-long-long" id="ref-for-idl-unsigned-long-long④">unsigned long long</a></code>, initially 0.</p>
+       <li data-md>
+        <p>Let <var>sourceObserver</var> be a new <a data-link-type="dfn" href="#internal-observer" id="ref-for-internal-observer⑥">internal observer</a>, initialized as follows:</p>
+        <dl>
+         <dt data-md><a data-link-type="dfn" href="#internal-observer-next-steps" id="ref-for-internal-observer-next-steps⑥">next steps</a>
+         <dd data-md>
+          <ol>
+           <li data-md>
+            <p><a data-link-type="dfn" href="https://webidl.spec.whatwg.org/#invoke-a-callback-function" id="ref-for-invoke-a-callback-function⑨">Invoke</a> <var>mapper</var> with the passed in <var>value</var>, and <var>idx</var>, and let <var>mappedValue</var> be the returned value.</p>
+            <p>If <a data-link-type="dfn" href="https://webidl.spec.whatwg.org/#an-exception-was-thrown" id="ref-for-an-exception-was-thrown①⓪">an exception <var>E</var> was thrown</a>,
+  then run <var>subscriber</var>’s <code class="idl"><a data-link-type="idl" href="#dom-subscriber-error" id="ref-for-dom-subscriber-error⑤">error()</a></code> method, given <var>E</var>, <a data-link-type="dfn" href="https://dom.spec.whatwg.org/#abortcontroller-signal-abort" id="ref-for-abortcontroller-signal-abort⑥">signal abort</a> <var>controller</var>, and abort these steps.</p>
+           <li data-md>
+            <p>Increment <var>idx</var>.</p>
+           <li data-md>
+            <p>Run <var>subscriber</var>’s <code class="idl"><a data-link-type="idl" href="#dom-subscriber-next" id="ref-for-dom-subscriber-next②">next()</a></code> method, given <var>mappedValue</var>.</p>
+          </ol>
+         <dt data-md><a data-link-type="dfn" href="#internal-observer-error-steps" id="ref-for-internal-observer-error-steps⑥">error steps</a>
+         <dd data-md>
+          <p>Run <var>subscriber</var>’s <code class="idl"><a data-link-type="idl" href="#dom-subscriber-error" id="ref-for-dom-subscriber-error⑥">error()</a></code> method, given the passed in <var>error</var>.</p>
+         <dt data-md><a data-link-type="dfn" href="#internal-observer-complete-steps" id="ref-for-internal-observer-complete-steps⑤">complete steps</a>
+         <dd data-md>
+          <p>Run <var>subscriber</var>’s <code class="idl"><a data-link-type="idl" href="#dom-subscriber-complete" id="ref-for-dom-subscriber-complete⑤">complete()</a></code> method.</p>
+        </dl>
+       <li data-md>
+        <p>Let <var>signal</var> be the result of <a data-link-type="dfn" href="https://dom.spec.whatwg.org/#create-a-dependent-abort-signal" id="ref-for-create-a-dependent-abort-signal③">creating a dependent abort signal</a> from the list
+  «<var>controller</var>’s <a data-link-type="dfn" href="https://dom.spec.whatwg.org/#abortcontroller-signal" id="ref-for-abortcontroller-signal③">signal</a>, <var>subscriber</var>’s <a data-link-type="dfn" href="#subscriber-signal" id="ref-for-subscriber-signal⑤">signal</a>», using <code class="idl"><a data-link-type="idl" href="https://dom.spec.whatwg.org/#abortsignal" id="ref-for-abortsignal⑤">AbortSignal</a></code>, and the <a data-link-type="dfn" href="https://tc39.es/ecma262/#current-realm" id="ref-for-current-realm②">current realm</a>.</p>
+       <li data-md>
+        <p>Let <var>options</var> be a new <code class="idl"><a data-link-type="idl" href="#dictdef-subscribeoptions" id="ref-for-dictdef-subscribeoptions①①">SubscribeOptions</a></code> whose <code class="idl"><a data-link-type="idl" href="#dom-subscribeoptions-signal" id="ref-for-dom-subscribeoptions-signal④">signal</a></code> is <var>signal</var>.</p>
+       <li data-md>
+        <p><a data-link-type="dfn" href="#observable-subscribe-to-an-observable" id="ref-for-observable-subscribe-to-an-observable⑦">Subscribe</a> to <var>sourceObservable</var> given <var>sourceObserver</var> and <var>options</var>.</p>
+      </ol>
+     <li data-md>
+      <p>Return <var>observable</var>.</p>
     </ol>
    </div>
    <div class="algorithm" data-algorithm="filter(predicate)" data-algorithm-for="Observable">
@@ -1477,43 +1517,43 @@ <h4 class="heading settled" data-level="2.3.3" id="promise-returning-operators">
      <li data-md>
       <p>Let <var>p</var> <a data-link-type="dfn" href="https://webidl.spec.whatwg.org/#a-new-promise" id="ref-for-a-new-promise">a new promise</a>.</p>
      <li data-md>
-      <p>If <var>options</var>’s <code class="idl"><a data-link-type="idl" href="#dom-subscribeoptions-signal" id="ref-for-dom-subscribeoptions-signal④">signal</a></code> is not null:</p>
+      <p>If <var>options</var>’s <code class="idl"><a data-link-type="idl" href="#dom-subscribeoptions-signal" id="ref-for-dom-subscribeoptions-signal⑤">signal</a></code> is not null:</p>
       <ol>
        <li data-md>
-        <p>If <var>options</var>’s <code class="idl"><a data-link-type="idl" href="#dom-subscribeoptions-signal" id="ref-for-dom-subscribeoptions-signal⑤">signal</a></code> is <a data-link-type="dfn" href="https://dom.spec.whatwg.org/#abortsignal-aborted" id="ref-for-abortsignal-aborted②">aborted</a>, then:</p>
+        <p>If <var>options</var>’s <code class="idl"><a data-link-type="idl" href="#dom-subscribeoptions-signal" id="ref-for-dom-subscribeoptions-signal⑥">signal</a></code> is <a data-link-type="dfn" href="https://dom.spec.whatwg.org/#abortsignal-aborted" id="ref-for-abortsignal-aborted②">aborted</a>, then:</p>
         <ol>
          <li data-md>
-          <p><a data-link-type="dfn" href="https://webidl.spec.whatwg.org/#reject" id="ref-for-reject">Reject</a> <var>p</var> with <var>options</var>’s <code class="idl"><a data-link-type="idl" href="#dom-subscribeoptions-signal" id="ref-for-dom-subscribeoptions-signal⑥">signal</a></code>'s <a data-link-type="dfn" href="https://dom.spec.whatwg.org/#abortsignal-abort-reason" id="ref-for-abortsignal-abort-reason">abort
+          <p><a data-link-type="dfn" href="https://webidl.spec.whatwg.org/#reject" id="ref-for-reject">Reject</a> <var>p</var> with <var>options</var>’s <code class="idl"><a data-link-type="idl" href="#dom-subscribeoptions-signal" id="ref-for-dom-subscribeoptions-signal⑦">signal</a></code>'s <a data-link-type="dfn" href="https://dom.spec.whatwg.org/#abortsignal-abort-reason" id="ref-for-abortsignal-abort-reason">abort
  reason</a>.</p>
          <li data-md>
           <p>Return <var>p</var>.</p>
         </ol>
        <li data-md>
-        <p><a data-link-type="dfn" href="https://dom.spec.whatwg.org/#abortsignal-add" id="ref-for-abortsignal-add①">Add the following abort algorithm</a> to <var>options</var>’s <code class="idl"><a data-link-type="idl" href="#dom-subscribeoptions-signal" id="ref-for-dom-subscribeoptions-signal⑦">signal</a></code>:</p>
+        <p><a data-link-type="dfn" href="https://dom.spec.whatwg.org/#abortsignal-add" id="ref-for-abortsignal-add①">Add the following abort algorithm</a> to <var>options</var>’s <code class="idl"><a data-link-type="idl" href="#dom-subscribeoptions-signal" id="ref-for-dom-subscribeoptions-signal⑧">signal</a></code>:</p>
         <ol>
          <li data-md>
-          <p><a data-link-type="dfn" href="https://webidl.spec.whatwg.org/#reject" id="ref-for-reject①">Reject</a> <var>p</var> with <var>options</var>’s <code class="idl"><a data-link-type="idl" href="#dom-subscribeoptions-signal" id="ref-for-dom-subscribeoptions-signal⑧">signal</a></code>'s <a data-link-type="dfn" href="https://dom.spec.whatwg.org/#abortsignal-abort-reason" id="ref-for-abortsignal-abort-reason①">abort
+          <p><a data-link-type="dfn" href="https://webidl.spec.whatwg.org/#reject" id="ref-for-reject①">Reject</a> <var>p</var> with <var>options</var>’s <code class="idl"><a data-link-type="idl" href="#dom-subscribeoptions-signal" id="ref-for-dom-subscribeoptions-signal⑨">signal</a></code>'s <a data-link-type="dfn" href="https://dom.spec.whatwg.org/#abortsignal-abort-reason" id="ref-for-abortsignal-abort-reason①">abort
  reason</a>.</p>
         </ol>
-        <p class="note" role="note"><span class="marker">Note:</span> All we have to do here is <a data-link-type="dfn" href="https://webidl.spec.whatwg.org/#reject" id="ref-for-reject②">reject</a> <var>p</var>. Note that the subscription to <a data-link-type="dfn" href="https://webidl.spec.whatwg.org/#this" id="ref-for-this②②">this</a> <code class="idl"><a data-link-type="idl" href="#observable" id="ref-for-observable②②">Observable</a></code> will also be canceled automatically, since the "inner" <a data-link-type="dfn" href="#subscriber-signal" id="ref-for-subscriber-signal⑤">signal</a> (created during <a data-link-type="dfn" href="#observable-subscribe-to-an-observable" id="ref-for-observable-subscribe-to-an-observable⑦">subscription</a>) is a <a data-link-type="dfn" href="https://dom.spec.whatwg.org#abortsignal-dependent-signals" id="ref-for-abortsignal-dependent-signals">dependent signal</a> of <var>options</var>’s <code class="idl"><a data-link-type="idl" href="#dom-subscribeoptions-signal" id="ref-for-dom-subscribeoptions-signal⑨">signal</a></code>.</p>
+        <p class="note" role="note"><span class="marker">Note:</span> All we have to do here is <a data-link-type="dfn" href="https://webidl.spec.whatwg.org/#reject" id="ref-for-reject②">reject</a> <var>p</var>. Note that the subscription to <a data-link-type="dfn" href="https://webidl.spec.whatwg.org/#this" id="ref-for-this②③">this</a> <code class="idl"><a data-link-type="idl" href="#observable" id="ref-for-observable②③">Observable</a></code> will also be canceled automatically, since the "inner" <a data-link-type="dfn" href="#subscriber-signal" id="ref-for-subscriber-signal⑥">signal</a> (created during <a data-link-type="dfn" href="#observable-subscribe-to-an-observable" id="ref-for-observable-subscribe-to-an-observable⑧">subscription</a>) is a <a data-link-type="dfn" href="https://dom.spec.whatwg.org#abortsignal-dependent-signals" id="ref-for-abortsignal-dependent-signals">dependent signal</a> of <var>options</var>’s <code class="idl"><a data-link-type="idl" href="#dom-subscribeoptions-signal" id="ref-for-dom-subscribeoptions-signal①⓪">signal</a></code>.</p>
       </ol>
      <li data-md>
       <p>Let <var>values</var> be a new <a data-link-type="dfn" href="https://infra.spec.whatwg.org/#list" id="ref-for-list①">list</a>.</p>
      <li data-md>
-      <p>Let <var>observer</var> be a new <a data-link-type="dfn" href="#internal-observer" id="ref-for-internal-observer⑥">internal observer</a>, initialized as follows:</p>
+      <p>Let <var>observer</var> be a new <a data-link-type="dfn" href="#internal-observer" id="ref-for-internal-observer⑦">internal observer</a>, initialized as follows:</p>
       <dl>
-       <dt data-md><a data-link-type="dfn" href="#internal-observer-next-steps" id="ref-for-internal-observer-next-steps⑥">next steps</a>
+       <dt data-md><a data-link-type="dfn" href="#internal-observer-next-steps" id="ref-for-internal-observer-next-steps⑦">next steps</a>
        <dd data-md>
         <p><a data-link-type="dfn" href="https://infra.spec.whatwg.org/#list-append" id="ref-for-list-append①">Append</a> the passed in <var>value</var> to <var>values</var>.</p>
-       <dt data-md><a data-link-type="dfn" href="#internal-observer-error-steps" id="ref-for-internal-observer-error-steps⑥">error steps</a>
+       <dt data-md><a data-link-type="dfn" href="#internal-observer-error-steps" id="ref-for-internal-observer-error-steps⑦">error steps</a>
        <dd data-md>
         <p><a data-link-type="dfn" href="https://webidl.spec.whatwg.org/#reject" id="ref-for-reject③">Reject</a> <var>p</var> with the passed in <var>error</var>.</p>
-       <dt data-md><a data-link-type="dfn" href="#internal-observer-complete-steps" id="ref-for-internal-observer-complete-steps⑤">complete steps</a>
+       <dt data-md><a data-link-type="dfn" href="#internal-observer-complete-steps" id="ref-for-internal-observer-complete-steps⑥">complete steps</a>
        <dd data-md>
         <p><a data-link-type="dfn" href="https://webidl.spec.whatwg.org/#resolve" id="ref-for-resolve">Resolve</a> <var>p</var> with <var>values</var>.</p>
       </dl>
      <li data-md>
-      <p><a data-link-type="dfn" href="#observable-subscribe-to-an-observable" id="ref-for-observable-subscribe-to-an-observable⑧">Subscribe</a> to <a data-link-type="dfn" href="https://webidl.spec.whatwg.org/#this" id="ref-for-this②③">this</a> given <var>observer</var> and <var>options</var>.</p>
+      <p><a data-link-type="dfn" href="#observable-subscribe-to-an-observable" id="ref-for-observable-subscribe-to-an-observable⑨">Subscribe</a> to <a data-link-type="dfn" href="https://webidl.spec.whatwg.org/#this" id="ref-for-this②④">this</a> given <var>observer</var> and <var>options</var>.</p>
      <li data-md>
       <p>Return <var>p</var>.</p>
     </ol>
@@ -1524,63 +1564,63 @@ <h4 class="heading settled" data-level="2.3.3" id="promise-returning-operators">
      <li data-md>
       <p>Let <var>p</var> <a data-link-type="dfn" href="https://webidl.spec.whatwg.org/#a-new-promise" id="ref-for-a-new-promise①">a new promise</a>.</p>
      <li data-md>
-      <p>Let <var>visitor callback controller</var> be a <a data-link-type="dfn" href="https://webidl.spec.whatwg.org/#new" id="ref-for-new③">new</a> <code class="idl"><a data-link-type="idl" href="https://dom.spec.whatwg.org/#abortcontroller" id="ref-for-abortcontroller②">AbortController</a></code>.</p>
+      <p>Let <var>visitor callback controller</var> be a <a data-link-type="dfn" href="https://webidl.spec.whatwg.org/#new" id="ref-for-new⑤">new</a> <code class="idl"><a data-link-type="idl" href="https://dom.spec.whatwg.org/#abortcontroller" id="ref-for-abortcontroller③">AbortController</a></code>.</p>
      <li data-md>
-      <p>Let <var>internal options</var> be a new <code class="idl"><a data-link-type="idl" href="#dictdef-subscribeoptions" id="ref-for-dictdef-subscribeoptions①①">SubscribeOptions</a></code> whose <code class="idl"><a data-link-type="idl" href="#dom-subscribeoptions-signal" id="ref-for-dom-subscribeoptions-signal①⓪">signal</a></code> is the
- result of <a data-link-type="dfn" href="https://dom.spec.whatwg.org/#create-a-dependent-abort-signal" id="ref-for-create-a-dependent-abort-signal③">creating a dependent abort signal</a> from the list
- «<var>visitor callback controller</var>’s <a data-link-type="dfn" href="https://dom.spec.whatwg.org/#abortcontroller-signal" id="ref-for-abortcontroller-signal③">signal</a>, <var>options</var>’s <code class="idl"><a data-link-type="idl" href="#dom-subscribeoptions-signal" id="ref-for-dom-subscribeoptions-signal①①">signal</a></code> if non-null», using <code class="idl"><a data-link-type="idl" href="https://dom.spec.whatwg.org/#abortsignal" id="ref-for-abortsignal⑤">AbortSignal</a></code>, and the <a data-link-type="dfn" href="https://tc39.es/ecma262/#current-realm" id="ref-for-current-realm②">current realm</a>.</p>
+      <p>Let <var>internal options</var> be a new <code class="idl"><a data-link-type="idl" href="#dictdef-subscribeoptions" id="ref-for-dictdef-subscribeoptions①②">SubscribeOptions</a></code> whose <code class="idl"><a data-link-type="idl" href="#dom-subscribeoptions-signal" id="ref-for-dom-subscribeoptions-signal①①">signal</a></code> is the
+ result of <a data-link-type="dfn" href="https://dom.spec.whatwg.org/#create-a-dependent-abort-signal" id="ref-for-create-a-dependent-abort-signal④">creating a dependent abort signal</a> from the list
+ «<var>visitor callback controller</var>’s <a data-link-type="dfn" href="https://dom.spec.whatwg.org/#abortcontroller-signal" id="ref-for-abortcontroller-signal④">signal</a>, <var>options</var>’s <code class="idl"><a data-link-type="idl" href="#dom-subscribeoptions-signal" id="ref-for-dom-subscribeoptions-signal①②">signal</a></code> if non-null», using <code class="idl"><a data-link-type="idl" href="https://dom.spec.whatwg.org/#abortsignal" id="ref-for-abortsignal⑥">AbortSignal</a></code>, and the <a data-link-type="dfn" href="https://tc39.es/ecma262/#current-realm" id="ref-for-current-realm③">current realm</a>.</p>
       <div class="note" role="note">
-       <p>Many trivial <a data-link-type="dfn" href="#internal-observer" id="ref-for-internal-observer⑦">internal observers</a> act as pass-throughs, and do not control the
-   subscription to the <code class="idl"><a data-link-type="idl" href="#observable" id="ref-for-observable②③">Observable</a></code> that they represent; that is, their <a data-link-type="dfn" href="#internal-observer-error-steps" id="ref-for-internal-observer-error-steps⑦">error steps</a> and <a data-link-type="dfn" href="#internal-observer-complete-steps" id="ref-for-internal-observer-complete-steps⑥">complete steps</a> are called when the
-   subscription is terminated, and their <a data-link-type="dfn" href="#internal-observer-next-steps" id="ref-for-internal-observer-next-steps⑦">next steps</a> simply pass some
+       <p>Many trivial <a data-link-type="dfn" href="#internal-observer" id="ref-for-internal-observer⑧">internal observers</a> act as pass-throughs, and do not control the
+   subscription to the <code class="idl"><a data-link-type="idl" href="#observable" id="ref-for-observable②④">Observable</a></code> that they represent; that is, their <a data-link-type="dfn" href="#internal-observer-error-steps" id="ref-for-internal-observer-error-steps⑧">error steps</a> and <a data-link-type="dfn" href="#internal-observer-complete-steps" id="ref-for-internal-observer-complete-steps⑦">complete steps</a> are called when the
+   subscription is terminated, and their <a data-link-type="dfn" href="#internal-observer-next-steps" id="ref-for-internal-observer-next-steps⑧">next steps</a> simply pass some
    version of the given value along the chain.</p>
-       <p>For this operator, however, the below <var>observer</var>’s <a data-link-type="dfn" href="#internal-observer-next-steps" id="ref-for-internal-observer-next-steps⑧">next steps</a> are
-   responsible for actually aborting the underlying subscription to <a data-link-type="dfn" href="https://webidl.spec.whatwg.org/#this" id="ref-for-this②④">this</a>, in the event
-   that <var>callback</var> throws an exception. In that case, the <code class="idl"><a data-link-type="idl" href="#dictdef-subscribeoptions" id="ref-for-dictdef-subscribeoptions①②">SubscribeOptions</a></code>'s <code class="idl"><a data-link-type="idl" href="#dom-subscribeoptions-signal" id="ref-for-dom-subscribeoptions-signal①②">signal</a></code> we pass through to "<a data-link-type="dfn" href="#observable-subscribe-to-an-observable" id="ref-for-observable-subscribe-to-an-observable⑨">Subscribe to an <code>Observable</code></a>", needs to be a <a data-link-type="dfn" href="https://dom.spec.whatwg.org/#create-a-dependent-abort-signal" id="ref-for-create-a-dependent-abort-signal④">dependent signal</a> derived from <var>options</var>’s <code class="idl"><a data-link-type="idl" href="#dom-subscribeoptions-signal" id="ref-for-dom-subscribeoptions-signal①③">signal</a></code>, <strong>and</strong> the <code class="idl"><a data-link-type="idl" href="https://dom.spec.whatwg.org/#abortsignal" id="ref-for-abortsignal⑥">AbortSignal</a></code> of an <code class="idl"><a data-link-type="idl" href="https://dom.spec.whatwg.org/#abortcontroller" id="ref-for-abortcontroller③">AbortController</a></code> that the <a data-link-type="dfn" href="#internal-observer-next-steps" id="ref-for-internal-observer-next-steps⑨">next steps</a> below has access to, and can <a data-link-type="dfn" href="https://dom.spec.whatwg.org/#abortcontroller-signal-abort" id="ref-for-abortcontroller-signal-abort⑥">signal
+       <p>For this operator, however, the below <var>observer</var>’s <a data-link-type="dfn" href="#internal-observer-next-steps" id="ref-for-internal-observer-next-steps⑨">next steps</a> are
+   responsible for actually aborting the underlying subscription to <a data-link-type="dfn" href="https://webidl.spec.whatwg.org/#this" id="ref-for-this②⑤">this</a>, in the event
+   that <var>callback</var> throws an exception. In that case, the <code class="idl"><a data-link-type="idl" href="#dictdef-subscribeoptions" id="ref-for-dictdef-subscribeoptions①③">SubscribeOptions</a></code>'s <code class="idl"><a data-link-type="idl" href="#dom-subscribeoptions-signal" id="ref-for-dom-subscribeoptions-signal①③">signal</a></code> we pass through to "<a data-link-type="dfn" href="#observable-subscribe-to-an-observable" id="ref-for-observable-subscribe-to-an-observable①⓪">Subscribe to an <code>Observable</code></a>", needs to be a <a data-link-type="dfn" href="https://dom.spec.whatwg.org/#create-a-dependent-abort-signal" id="ref-for-create-a-dependent-abort-signal⑤">dependent signal</a> derived from <var>options</var>’s <code class="idl"><a data-link-type="idl" href="#dom-subscribeoptions-signal" id="ref-for-dom-subscribeoptions-signal①④">signal</a></code>, <strong>and</strong> the <code class="idl"><a data-link-type="idl" href="https://dom.spec.whatwg.org/#abortsignal" id="ref-for-abortsignal⑦">AbortSignal</a></code> of an <code class="idl"><a data-link-type="idl" href="https://dom.spec.whatwg.org/#abortcontroller" id="ref-for-abortcontroller④">AbortController</a></code> that the <a data-link-type="dfn" href="#internal-observer-next-steps" id="ref-for-internal-observer-next-steps①⓪">next steps</a> below has access to, and can <a data-link-type="dfn" href="https://dom.spec.whatwg.org/#abortcontroller-signal-abort" id="ref-for-abortcontroller-signal-abort⑦">signal
    abort</a> when needed. </p>
       </div>
      <li data-md>
-      <p>If <var>internal options</var>’s <code class="idl"><a data-link-type="idl" href="#dom-subscribeoptions-signal" id="ref-for-dom-subscribeoptions-signal①④">signal</a></code> is <a data-link-type="dfn" href="https://dom.spec.whatwg.org/#abortsignal-aborted" id="ref-for-abortsignal-aborted③">aborted</a>, then:</p>
+      <p>If <var>internal options</var>’s <code class="idl"><a data-link-type="idl" href="#dom-subscribeoptions-signal" id="ref-for-dom-subscribeoptions-signal①⑤">signal</a></code> is <a data-link-type="dfn" href="https://dom.spec.whatwg.org/#abortsignal-aborted" id="ref-for-abortsignal-aborted③">aborted</a>, then:</p>
       <ol>
        <li data-md>
-        <p><a data-link-type="dfn" href="https://webidl.spec.whatwg.org/#reject" id="ref-for-reject④">Reject</a> <var>p</var> with <var>internal options</var>’s <code class="idl"><a data-link-type="idl" href="#dom-subscribeoptions-signal" id="ref-for-dom-subscribeoptions-signal①⑤">signal</a></code>'s <a data-link-type="dfn" href="https://dom.spec.whatwg.org/#abortsignal-abort-reason" id="ref-for-abortsignal-abort-reason②">abort reason</a>.</p>
+        <p><a data-link-type="dfn" href="https://webidl.spec.whatwg.org/#reject" id="ref-for-reject④">Reject</a> <var>p</var> with <var>internal options</var>’s <code class="idl"><a data-link-type="idl" href="#dom-subscribeoptions-signal" id="ref-for-dom-subscribeoptions-signal①⑥">signal</a></code>'s <a data-link-type="dfn" href="https://dom.spec.whatwg.org/#abortsignal-abort-reason" id="ref-for-abortsignal-abort-reason②">abort reason</a>.</p>
        <li data-md>
         <p>Return <var>p</var>.</p>
       </ol>
      <li data-md>
-      <p><a data-link-type="dfn" href="https://dom.spec.whatwg.org/#abortsignal-add" id="ref-for-abortsignal-add②">Add the following abort algorithm</a> to <var>internal options</var>’s <code class="idl"><a data-link-type="idl" href="#dom-subscribeoptions-signal" id="ref-for-dom-subscribeoptions-signal①⑥">signal</a></code>:</p>
+      <p><a data-link-type="dfn" href="https://dom.spec.whatwg.org/#abortsignal-add" id="ref-for-abortsignal-add②">Add the following abort algorithm</a> to <var>internal options</var>’s <code class="idl"><a data-link-type="idl" href="#dom-subscribeoptions-signal" id="ref-for-dom-subscribeoptions-signal①⑦">signal</a></code>:</p>
       <ol>
        <li data-md>
-        <p><a data-link-type="dfn" href="https://webidl.spec.whatwg.org/#reject" id="ref-for-reject⑤">Reject</a> <var>p</var> with <var>internal options</var>’s <code class="idl"><a data-link-type="idl" href="#dom-subscribeoptions-signal" id="ref-for-dom-subscribeoptions-signal①⑦">signal</a></code>'s <a data-link-type="dfn" href="https://dom.spec.whatwg.org/#abortsignal-abort-reason" id="ref-for-abortsignal-abort-reason③">abort
+        <p><a data-link-type="dfn" href="https://webidl.spec.whatwg.org/#reject" id="ref-for-reject⑤">Reject</a> <var>p</var> with <var>internal options</var>’s <code class="idl"><a data-link-type="idl" href="#dom-subscribeoptions-signal" id="ref-for-dom-subscribeoptions-signal①⑧">signal</a></code>'s <a data-link-type="dfn" href="https://dom.spec.whatwg.org/#abortsignal-abort-reason" id="ref-for-abortsignal-abort-reason③">abort
   reason</a>.</p>
-        <p class="note" role="note"><span class="marker">Note:</span> The fact that rejection of <var>p</var> is tied to <var>internal options</var>’s <code class="idl"><a data-link-type="idl" href="#dom-subscribeoptions-signal" id="ref-for-dom-subscribeoptions-signal①⑧">signal</a></code>, and not <var>options</var>’s <code class="idl"><a data-link-type="idl" href="#dom-subscribeoptions-signal" id="ref-for-dom-subscribeoptions-signal①⑨">signal</a></code> means, that
-  any <a data-link-type="dfn" href="https://html.spec.whatwg.org/multipage/webappapis.html#microtask" id="ref-for-microtask">microtasks</a> <a data-link-type="dfn" href="https://html.spec.whatwg.org/multipage/webappapis.html#queue-a-microtask" id="ref-for-queue-a-microtask">queued</a> during the firing of <var>options</var>’s <code class="idl"><a data-link-type="idl" href="#dom-subscribeoptions-signal" id="ref-for-dom-subscribeoptions-signal②⓪">signal</a></code>'s <code class="idl"><a data-link-type="idl" href="https://dom.spec.whatwg.org/#eventdef-abortsignal-abort" id="ref-for-eventdef-abortsignal-abort">abort</a></code> event will run before <var>p</var>’s
+        <p class="note" role="note"><span class="marker">Note:</span> The fact that rejection of <var>p</var> is tied to <var>internal options</var>’s <code class="idl"><a data-link-type="idl" href="#dom-subscribeoptions-signal" id="ref-for-dom-subscribeoptions-signal①⑨">signal</a></code>, and not <var>options</var>’s <code class="idl"><a data-link-type="idl" href="#dom-subscribeoptions-signal" id="ref-for-dom-subscribeoptions-signal②⓪">signal</a></code> means, that
+  any <a data-link-type="dfn" href="https://html.spec.whatwg.org/multipage/webappapis.html#microtask" id="ref-for-microtask">microtasks</a> <a data-link-type="dfn" href="https://html.spec.whatwg.org/multipage/webappapis.html#queue-a-microtask" id="ref-for-queue-a-microtask">queued</a> during the firing of <var>options</var>’s <code class="idl"><a data-link-type="idl" href="#dom-subscribeoptions-signal" id="ref-for-dom-subscribeoptions-signal②①">signal</a></code>'s <code class="idl"><a data-link-type="idl" href="https://dom.spec.whatwg.org/#eventdef-abortsignal-abort" id="ref-for-eventdef-abortsignal-abort">abort</a></code> event will run before <var>p</var>’s
   rejection handler runs.</p>
       </ol>
      <li data-md>
-      <p>Let <var>idx</var> be an <code class="idl"><a data-link-type="idl" href="https://webidl.spec.whatwg.org/#idl-unsigned-long-long" id="ref-for-idl-unsigned-long-long④">unsigned long long</a></code>, initially 0.</p>
+      <p>Let <var>idx</var> be an <code class="idl"><a data-link-type="idl" href="https://webidl.spec.whatwg.org/#idl-unsigned-long-long" id="ref-for-idl-unsigned-long-long⑤">unsigned long long</a></code>, initially 0.</p>
      <li data-md>
-      <p>Let <var>observer</var> be a new <a data-link-type="dfn" href="#internal-observer" id="ref-for-internal-observer⑧">internal observer</a>, initialized as follows:</p>
+      <p>Let <var>observer</var> be a new <a data-link-type="dfn" href="#internal-observer" id="ref-for-internal-observer⑨">internal observer</a>, initialized as follows:</p>
       <dl>
-       <dt data-md><a data-link-type="dfn" href="#internal-observer-next-steps" id="ref-for-internal-observer-next-steps①⓪">next steps</a>
+       <dt data-md><a data-link-type="dfn" href="#internal-observer-next-steps" id="ref-for-internal-observer-next-steps①①">next steps</a>
        <dd data-md>
         <ol>
          <li data-md>
-          <p><a data-link-type="dfn" href="https://webidl.spec.whatwg.org/#invoke-a-callback-function" id="ref-for-invoke-a-callback-function⑨">Invoke</a> <var>callback</var> with the passed in <var>value</var>, and <var>idx</var>.</p>
-          <p>If <a data-link-type="dfn" href="https://webidl.spec.whatwg.org/#an-exception-was-thrown" id="ref-for-an-exception-was-thrown①⓪">an exception <var>E</var> was thrown</a>, then <a data-link-type="dfn" href="https://webidl.spec.whatwg.org/#reject" id="ref-for-reject⑥">reject</a> <var>p</var> with <var>E</var>, and <a data-link-type="dfn" href="https://dom.spec.whatwg.org/#abortcontroller-signal-abort" id="ref-for-abortcontroller-signal-abort⑦">signal abort</a> <var>visitor callback
+          <p><a data-link-type="dfn" href="https://webidl.spec.whatwg.org/#invoke-a-callback-function" id="ref-for-invoke-a-callback-function①⓪">Invoke</a> <var>callback</var> with the passed in <var>value</var>, and <var>idx</var>.</p>
+          <p>If <a data-link-type="dfn" href="https://webidl.spec.whatwg.org/#an-exception-was-thrown" id="ref-for-an-exception-was-thrown①①">an exception <var>E</var> was thrown</a>, then <a data-link-type="dfn" href="https://webidl.spec.whatwg.org/#reject" id="ref-for-reject⑥">reject</a> <var>p</var> with <var>E</var>, and <a data-link-type="dfn" href="https://dom.spec.whatwg.org/#abortcontroller-signal-abort" id="ref-for-abortcontroller-signal-abort⑧">signal abort</a> <var>visitor callback
    controller</var> with <var>E</var>.</p>
          <li data-md>
           <p>Increment <var>idx</var>.</p>
         </ol>
-       <dt data-md><a data-link-type="dfn" href="#internal-observer-error-steps" id="ref-for-internal-observer-error-steps⑧">error steps</a>
+       <dt data-md><a data-link-type="dfn" href="#internal-observer-error-steps" id="ref-for-internal-observer-error-steps⑨">error steps</a>
        <dd data-md>
         <p><a data-link-type="dfn" href="https://webidl.spec.whatwg.org/#reject" id="ref-for-reject⑦">Reject</a> <var>p</var> with the passed in <var>error</var>.</p>
-       <dt data-md><a data-link-type="dfn" href="#internal-observer-complete-steps" id="ref-for-internal-observer-complete-steps⑦">complete steps</a>
+       <dt data-md><a data-link-type="dfn" href="#internal-observer-complete-steps" id="ref-for-internal-observer-complete-steps⑧">complete steps</a>
        <dd data-md>
         <p><a data-link-type="dfn" href="https://webidl.spec.whatwg.org/#resolve" id="ref-for-resolve①">Resolve</a> <var>p</var> with <code class="idl"><a data-link-type="idl" href="https://webidl.spec.whatwg.org/#idl-undefined" id="ref-for-idl-undefined⑨">undefined</a></code>.</p>
       </dl>
      <li data-md>
-      <p><a data-link-type="dfn" href="#observable-subscribe-to-an-observable" id="ref-for-observable-subscribe-to-an-observable①⓪">Subscribe</a> to <a data-link-type="dfn" href="https://webidl.spec.whatwg.org/#this" id="ref-for-this②⑤">this</a> given <var>observer</var> and <var>internal options</var>.</p>
+      <p><a data-link-type="dfn" href="#observable-subscribe-to-an-observable" id="ref-for-observable-subscribe-to-an-observable①①">Subscribe</a> to <a data-link-type="dfn" href="https://webidl.spec.whatwg.org/#this" id="ref-for-this②⑥">this</a> given <var>observer</var> and <var>internal options</var>.</p>
      <li data-md>
       <p>Return <var>p</var>.</p>
     </ol>
@@ -1620,30 +1660,30 @@ <h2 class="heading settled" data-level="3" id="event-target-integration"><span c
 };
 
 <c- b>partial</c-> <c- b>interface</c-> <a class="idl-code" data-link-type="interface" href="https://dom.spec.whatwg.org/#eventtarget" id="ref-for-eventtarget①"><c- g>EventTarget</c-></a> {
-  <a data-link-type="idl-name" href="#observable" id="ref-for-observable②④"><c- n>Observable</c-></a> <a class="idl-code" data-link-type="method" href="#dom-eventtarget-on" id="ref-for-dom-eventtarget-on①"><c- g>on</c-></a>(<a class="idl-code" data-link-type="interface" href="https://webidl.spec.whatwg.org/#idl-DOMString" id="ref-for-idl-DOMString"><c- b>DOMString</c-></a> <dfn class="idl-code" data-dfn-for="EventTarget/on(type, options), EventTarget/on(type)" data-dfn-type="argument" data-export id="dom-eventtarget-on-type-options-type"><code><c- g>type</c-></code><a class="self-link" href="#dom-eventtarget-on-type-options-type"></a></dfn>, <c- b>optional</c-> <a data-link-type="idl-name" href="#dictdef-observableeventlisteneroptions" id="ref-for-dictdef-observableeventlisteneroptions"><c- n>ObservableEventListenerOptions</c-></a> <dfn class="idl-code" data-dfn-for="EventTarget/on(type, options), EventTarget/on(type)" data-dfn-type="argument" data-export id="dom-eventtarget-on-type-options-options"><code><c- g>options</c-></code><a class="self-link" href="#dom-eventtarget-on-type-options-options"></a></dfn> = {});
+  <a data-link-type="idl-name" href="#observable" id="ref-for-observable②⑤"><c- n>Observable</c-></a> <a class="idl-code" data-link-type="method" href="#dom-eventtarget-on" id="ref-for-dom-eventtarget-on①"><c- g>on</c-></a>(<a class="idl-code" data-link-type="interface" href="https://webidl.spec.whatwg.org/#idl-DOMString" id="ref-for-idl-DOMString"><c- b>DOMString</c-></a> <dfn class="idl-code" data-dfn-for="EventTarget/on(type, options), EventTarget/on(type)" data-dfn-type="argument" data-export id="dom-eventtarget-on-type-options-type"><code><c- g>type</c-></code><a class="self-link" href="#dom-eventtarget-on-type-options-type"></a></dfn>, <c- b>optional</c-> <a data-link-type="idl-name" href="#dictdef-observableeventlisteneroptions" id="ref-for-dictdef-observableeventlisteneroptions"><c- n>ObservableEventListenerOptions</c-></a> <dfn class="idl-code" data-dfn-for="EventTarget/on(type, options), EventTarget/on(type)" data-dfn-type="argument" data-export id="dom-eventtarget-on-type-options-options"><code><c- g>options</c-></code><a class="self-link" href="#dom-eventtarget-on-type-options-options"></a></dfn> = {});
 };
 </pre>
    <div class="algorithm" data-algorithm="on(type, options)" data-algorithm-for="EventTarget">
      The <dfn class="dfn-paneled idl-code" data-dfn-for="EventTarget" data-dfn-type="method" data-export data-lt="on(type, options)|on(type)" id="dom-eventtarget-on"><code>on(<var>type</var>, <var>options</var>)</code></dfn> method steps are: 
     <ol>
      <li data-md>
-      <p>If <a data-link-type="dfn" href="https://webidl.spec.whatwg.org/#this" id="ref-for-this②⑥">this</a>'s <a data-link-type="dfn" href="https://html.spec.whatwg.org/multipage/webappapis.html#concept-relevant-global" id="ref-for-concept-relevant-global⑥">relevant global object</a> is a <code class="idl"><a data-link-type="idl" href="https://html.spec.whatwg.org/multipage/nav-history-apis.html#window" id="ref-for-window⑥">Window</a></code> object, and its <a data-link-type="dfn" href="https://html.spec.whatwg.org/multipage/nav-history-apis.html#concept-document-window" id="ref-for-concept-document-window⑥">associated
+      <p>If <a data-link-type="dfn" href="https://webidl.spec.whatwg.org/#this" id="ref-for-this②⑦">this</a>'s <a data-link-type="dfn" href="https://html.spec.whatwg.org/multipage/webappapis.html#concept-relevant-global" id="ref-for-concept-relevant-global⑥">relevant global object</a> is a <code class="idl"><a data-link-type="idl" href="https://html.spec.whatwg.org/multipage/nav-history-apis.html#window" id="ref-for-window⑥">Window</a></code> object, and its <a data-link-type="dfn" href="https://html.spec.whatwg.org/multipage/nav-history-apis.html#concept-document-window" id="ref-for-concept-document-window⑥">associated
  Document</a> is not <a data-link-type="dfn" href="https://html.spec.whatwg.org/multipage/document-sequences.html#fully-active" id="ref-for-fully-active⑥">fully active</a>, then return.</p>
      <li data-md>
-      <p>Let <var>event target</var> be <a data-link-type="dfn" href="https://webidl.spec.whatwg.org/#this" id="ref-for-this②⑦">this</a>.</p>
+      <p>Let <var>event target</var> be <a data-link-type="dfn" href="https://webidl.spec.whatwg.org/#this" id="ref-for-this②⑧">this</a>.</p>
      <li data-md>
-      <p>Let <var>observable</var> be a <a data-link-type="dfn" href="https://webidl.spec.whatwg.org/#new" id="ref-for-new④">new</a> <code class="idl"><a data-link-type="idl" href="#observable" id="ref-for-observable②⑤">Observable</a></code>, initialized as follows:</p>
+      <p>Let <var>observable</var> be a <a data-link-type="dfn" href="https://webidl.spec.whatwg.org/#new" id="ref-for-new⑥">new</a> <code class="idl"><a data-link-type="idl" href="#observable" id="ref-for-observable②⑥">Observable</a></code>, initialized as follows:</p>
       <dl>
-       <dt data-md><a data-link-type="dfn" href="#observable-subscribe-callback" id="ref-for-observable-subscribe-callback⑥">subscribe callback</a>
+       <dt data-md><a data-link-type="dfn" href="#observable-subscribe-callback" id="ref-for-observable-subscribe-callback⑦">subscribe callback</a>
        <dd data-md>
-        <p>An algorithm that takes a <code class="idl"><a data-link-type="idl" href="#subscriber" id="ref-for-subscriber①⑤">Subscriber</a></code> <var>subscriber</var> and runs these steps:</p>
+        <p>An algorithm that takes a <code class="idl"><a data-link-type="idl" href="#subscriber" id="ref-for-subscriber①⑥">Subscriber</a></code> <var>subscriber</var> and runs these steps:</p>
         <ol>
          <li data-md>
           <p>If <var>event target</var> is null, abort these steps.</p>
           <p class="note" role="note"><span class="marker">Note:</span> This is meant to capture the fact that <var>event target</var> can be garbage collected
  by the time this algorithm runs upon subscription.</p>
          <li data-md>
-          <p>If <var>subscriber</var>’s <a data-link-type="dfn" href="#subscriber-signal" id="ref-for-subscriber-signal⑥">signal</a> is <a data-link-type="dfn" href="https://dom.spec.whatwg.org/#abortsignal-aborted" id="ref-for-abortsignal-aborted④">aborted</a>, abort these
+          <p>If <var>subscriber</var>’s <a data-link-type="dfn" href="#subscriber-signal" id="ref-for-subscriber-signal⑦">signal</a> is <a data-link-type="dfn" href="https://dom.spec.whatwg.org/#abortsignal-aborted" id="ref-for-abortsignal-aborted④">aborted</a>, abort these
  steps.</p>
          <li data-md>
           <p><a data-link-type="dfn" href="https://dom.spec.whatwg.org/#add-an-event-listener" id="ref-for-add-an-event-listener">Add an event listener</a> with <var>event target</var> and an <a data-link-type="dfn" href="https://dom.spec.whatwg.org/#concept-event-listener" id="ref-for-concept-event-listener">event listener</a> defined as follows:</p>
@@ -1668,7 +1708,7 @@ <h2 class="heading settled" data-level="3" id="event-target-integration"><span c
            <dt data-md><a data-link-type="dfn" href="https://dom.spec.whatwg.org#event-listener-signal" id="ref-for-event-listener-signal">signal</a>
            <dd data-md>
             <p>null</p>
-            <p class="note" role="note"><span class="marker">Note:</span> The <code class="idl"><a data-link-type="idl" href="https://dom.spec.whatwg.org/#abortsignal" id="ref-for-abortsignal⑦">AbortSignal</a></code> for event listeners <a data-link-type="dfn" href="https://dom.spec.whatwg.org/#add-an-event-listener" id="ref-for-add-an-event-listener①">added</a> by <code class="idl"><a data-link-type="idl" href="#dom-eventtarget-on" id="ref-for-dom-eventtarget-on②">on()</a></code> is managed by the <code class="idl"><a data-link-type="idl" href="#observable" id="ref-for-observable②⑥">Observable</a></code> itself. See <code class="idl"><a data-link-type="idl" href="#dom-observable-subscribe" id="ref-for-dom-observable-subscribe⑤">subscribe()</a></code> and <code class="idl"><a data-link-type="idl" href="#dictdef-subscribeoptions" id="ref-for-dictdef-subscribeoptions①③">SubscribeOptions</a></code>.</p>
+            <p class="note" role="note"><span class="marker">Note:</span> The <code class="idl"><a data-link-type="idl" href="https://dom.spec.whatwg.org/#abortsignal" id="ref-for-abortsignal⑧">AbortSignal</a></code> for event listeners <a data-link-type="dfn" href="https://dom.spec.whatwg.org/#add-an-event-listener" id="ref-for-add-an-event-listener①">added</a> by <code class="idl"><a data-link-type="idl" href="#dom-eventtarget-on" id="ref-for-dom-eventtarget-on②">on()</a></code> is managed by the <code class="idl"><a data-link-type="idl" href="#observable" id="ref-for-observable②⑦">Observable</a></code> itself. See <code class="idl"><a data-link-type="idl" href="#dom-observable-subscribe" id="ref-for-dom-observable-subscribe⑤">subscribe()</a></code> and <code class="idl"><a data-link-type="idl" href="#dictdef-subscribeoptions" id="ref-for-dictdef-subscribeoptions①④">SubscribeOptions</a></code>.</p>
           </dl>
         </ol>
       </dl>
@@ -1677,11 +1717,11 @@ <h2 class="heading settled" data-level="3" id="event-target-integration"><span c
     </ol>
    </div>
    <div class="algorithm" data-algorithm="observable event listener invoke algorithm">
-     The <dfn class="dfn-paneled" data-dfn-type="dfn" data-noexport id="observable-event-listener-invoke-algorithm">observable event listener invoke algorithm</dfn> takes a <code class="idl"><a data-link-type="idl" href="#subscriber" id="ref-for-subscriber①⑥">Subscriber</a></code> <var>subscriber</var> and
+     The <dfn class="dfn-paneled" data-dfn-type="dfn" data-noexport id="observable-event-listener-invoke-algorithm">observable event listener invoke algorithm</dfn> takes a <code class="idl"><a data-link-type="idl" href="#subscriber" id="ref-for-subscriber①⑦">Subscriber</a></code> <var>subscriber</var> and
   an <code class="idl"><a data-link-type="idl" href="https://dom.spec.whatwg.org/#event" id="ref-for-event①">Event</a></code> <var>event</var>, and runs these steps: 
     <ol>
      <li data-md>
-      <p>Run <var>subscriber</var>’s <code class="idl"><a data-link-type="idl" href="#dom-subscriber-next" id="ref-for-dom-subscriber-next②">next()</a></code> method with <var>event</var>.</p>
+      <p>Run <var>subscriber</var>’s <code class="idl"><a data-link-type="idl" href="#dom-subscriber-next" id="ref-for-dom-subscriber-next③">next()</a></code> method with <var>event</var>.</p>
     </ol>
    </div>
    <h2 class="heading settled" data-level="4" id="security-and-privacy"><span class="secno">4. </span><span class="content">Security &amp; Privacy Considerations</span><a class="self-link" href="#security-and-privacy"></a></h2>
@@ -1693,7 +1733,7 @@ <h2 class="heading settled" data-level="4" id="security-and-privacy"><span class
    </ul>
    <h2 class="heading settled" data-level="5" id="acks"><span class="secno">5. </span><span class="content">Acknowledgements</span><a class="self-link" href="#acks"></a></h2>
    <p>A special thanks to <a href="https://benlesh.com/">Ben Lesh</a> for much of the design
-input for the <code class="idl"><a data-link-type="idl" href="#observable" id="ref-for-observable②⑦">Observable</a></code> API, and his many years of work maintaining
+input for the <code class="idl"><a data-link-type="idl" href="#observable" id="ref-for-observable②⑧">Observable</a></code> API, and his many years of work maintaining
 userland Observable code that made this contribution to the web platform
 possible.</p>
   </main>
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@@ -2333,23 +2373,23 @@ <h2 class="no-num no-ref heading settled" id="idl-index"><span class="content">I
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