Use platform object rather than IDL-defined object

Platform object is an actual established term and not something I made
up on the spot.

source

@@ -7607,21 +7607,20 @@ interface <dfn>DOMStringMap</dfn> {
   <span>cloneable objects</span> and not all aspects of objects that are <span>cloneable
   objects</span> are necessarily preserved when cloned.</p>
 
-  <p>IDL-defined objects have the following internal method:</p>
+  <p><span data-x="platform object">Platform objects</span> have the following internal method:</p>
 
   <p>[[<dfn>Clone</dfn>]] ( <var>targetRealm</var>, <var>memory</var> )</p>
   <!-- For /deepClone/ support /memory/ would need to be changed as per StructuredClone or we would
        need to add a [[DeepClone]] abstract operation. -->
 
   <p>Unless specified otherwise, invoking the [[<span>Clone</span>]] internal method must throw a
-  <code>DataCloneError</code> exception. (By default, IDL-defined objects are not <span>cloneable
-  objects</span>.)</p>
+  <code>DataCloneError</code> exception. (By default, <span data-x="platform object">platform
+  objects</span> are not <span>cloneable objects</span>.)</p>
 
-  <p>IDL-defined cloneable objects are <span>cloneable objects</span> defined through IDL whose
-  [[<span>Clone</span>]] internal method is specified to run a series of steps. The result of
-  running those steps must be a thrown exception or a clone of <b>this</b>, created in
-  <var>targetRealm</var>. It is up to IDL-defined cloneable objects to define what cloning means for
-  them.</p>
+  <p><span data-x="platform object">Platform objects</span> that are <span>cloneable objects</span>
+  have a [[<span>Clone</span>]] internal method which is specified to run a series of steps. The
+  result of running those steps must be a thrown exception or a clone of <b>this</b>, created in
+  <var>targetRealm</var>. It is up such objects to define what cloning means for them.</p>
 
   <p>Objects defined in the JavaScript specification are handled by the <span>StructuredClone</span>
   abstract operation directly.</p>
@@ -7638,22 +7637,23 @@ interface <dfn>DOMStringMap</dfn> {
   <p class="note">Transferring is an irreversible and non-idempotent operation. Once an object has
   been transferred, it cannot be transferred, or indeed used, again.</p>
 
-  <p>IDL-defined transferable objects are <span>transferable objects</span> defined through IDL that
-  have a [[<dfn>Detached</dfn>]] internal slot and the following internal method:</p>
+  <p><span data-x="platform object">Platform objects</span> that are <span>transferable
+  objects</span> have a [[<dfn>Detached</dfn>]] internal slot and the following internal method:</p>
 
   <p>[[<dfn>Transfer</dfn>]] ( <var>targetRealm</var> )</p>
   <!-- If we ever add /memory/ support here we need to update the language around replacing
        references -->
 
-  <p class="note">Whereas all IDL-defined objects have a [[<span>Clone</span>]] internal method, not
-  all have a [[<span>Detached</span>]] internal slot and a [[<span>Transfer</span>]] internal
-  method.</p>
+  <p class="note">Whereas all <span data-x="platform object">platform objects</span> have a
+  [[<span>Clone</span>]] internal method, not all have a [[<span>Detached</span>]] internal slot and
+  a [[<span>Transfer</span>]] internal method.</p>
 
-  <p>IDL-defined transferable objects must define the [[<span>Transfer</span>]] internal method such
-  that it either throws an exception or returns a clone of <b>this</b>, created in
-  <var>targetRealm</var>, with <b>this</b>'s underlying data shared with the return value, and
-  <b>this</b>'s [[<span>Detached</span>]] internal slot value set to true. It is up to IDL-defined
-  transferable objects to define what transfering means for them.</p>
+  <p><span data-x="platform object">Platform objects</span> that are <span>transferable
+  objects</span> must define the [[<span>Transfer</span>]] internal method such that it either
+  throws an exception or returns a clone of <b>this</b>, created in <var>targetRealm</var>, with
+  <b>this</b>'s underlying data shared with the return value, and <b>this</b>'s
+  [[<span>Detached</span>]] internal slot value set to true. It is up to such objects to define what
+  transfering means for them.</p>
 
   <p>Objects defined in the JavaScript specification are handled by the
   <span>StructuredCloneWithTransfer</span> abstract operation directly. (Technically, by