Address ljharb review

Author: syg

spec.html

@@ -7756,7 +7756,7 @@ <h1>Jobs and Host Operations to Enqueue Jobs</h1>
       <h1>JobCallback Records</h1>
       <p>The JobCallback is a Record value used to store a callable object and a host-defined value. Callable objects that are invoked via a Job enqueued by the host may have additional host-defined context. To propagate the state, Job Abstract Closures should not capture and call callable objects directly. Instead, use HostMakeJobCallback and HostCallJobCallback (or its convenience wrapper CallJobCallback).</p>
       <emu-note>
-        <p>For example, WHATWG HTML uses the host-defined value to propagate the incumbent settings object for Promise callbacks.</p>
+        <p>The WHATWG HTML specification (<a href="https://html.spec.whatwg.org/">https://html.spec.whatwg.org/</a>), for example, uses the host-defined value to propagate the incumbent settings object for Promise callbacks.</p>
       </emu-note>
       <p>JobCallback Records have the fields listed in <emu-xref href="#table-jobcallback-records"></emu-xref>.</p>
       <emu-table id="table-jobcallback-records" caption="JobCallback Record Fields">
@@ -7811,11 +7811,11 @@ <h1>HostMakeJobCallback ( _callable_ )</h1>
       <p>The default implementation of HostMakeJobCallback performs the following steps when called:</p>
       <emu-alg>
         1. Assert: IsCallable(_callable_) is *true*.
-        1. Return the JobCallback Record { [[Callback]]: _callable_, [[HostDefined]]: *undefined* }.
+        1. Return the JobCallback Record { [[Callback]]: _callable_, [[HostDefined]]: ~empty~ }.
       </emu-alg>
       <p>ECMAScript hosts that are not web browsers must use the default implementation of HostMakeJobCallback.</p>
       <emu-note>
-        <p>This is called at the time that the callback is passed to the function that is responsible for its being eventually scheduled and run. For example, `Promise.prototype.then(thenAction)` calls MakeJobCallback on `thenAction` at the time of invoking `Promise.prototype.then`, not at the time of scheduling the reaction Job.</p>
+        <p>This is called at the time that the callback is passed to the function that is responsible for its being eventually scheduled and run. For example, `promise.then(thenAction)` calls MakeJobCallback on `thenAction` at the time of invoking `Promise.prototype.then`, not at the time of scheduling the reaction Job.</p>
       </emu-note>
     </emu-clause>
 
@@ -22683,7 +22683,7 @@ <h1>Script Records</h1>
               [[HostDefined]]
             </td>
             <td>
-              Any, default value is *undefined*.
+              Any, default value is ~empty~.
             </td>
             <td>
               Field reserved for use by host environments that need to associate additional information with a script.