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Editorial: Accommodate changes to InitializeHostDefinedRealm #11962

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Editorial: Accommodate changes to InitializeHostDefinedRealm #11962

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7128df7
IHDR might add a _customizations_ parameter
jmdyck Nov 26, 2025
772b5a5
IHDR might return the realm execution context
jmdyck Nov 26, 2025
6fca7d2
IHDR might be renamed 'MakeRealm'
jmdyck Nov 26, 2025
9f66500
tweak linebreaking
jmdyck Nov 28, 2025
91f0f09
Delete "the following steps are taken"
jmdyck Nov 28, 2025
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98 changes: 54 additions & 44 deletions source
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Original file line number Diff line number Diff line change
Expand Up @@ -3117,7 +3117,7 @@ a.setAttribute('href', 'https://example.com/'); // change the content attribute
<li>The <dfn data-x="js-HostLoadImportedModule" data-x-href="https://tc39.es/ecma262/#sec-HostLoadImportedModule">HostLoadImportedModule</dfn> abstract operation</li>
<li>The <dfn data-x="js-HostMakeJobCallback" data-x-href="https://tc39.es/ecma262/#sec-hostmakejobcallback">HostMakeJobCallback</dfn> abstract operation</li>
<li>The <dfn data-x="js-HostPromiseRejectionTracker" data-x-href="https://tc39.es/ecma262/#sec-host-promise-rejection-tracker">HostPromiseRejectionTracker</dfn> abstract operation</li>
<li>The <dfn data-x="js-InitializeHostDefinedRealm" data-x-href="https://tc39.es/ecma262/#sec-initializehostdefinedrealm">InitializeHostDefinedRealm</dfn> abstract operation</li>
<li>The <dfn data-x="js-MakeRealm" data-x-href="https://tc39.es/ecma262/#sec-makerealm">MakeRealm</dfn> abstract operation</li>
<li>The <dfn data-x-href="https://tc39.es/ecma262/#sec-isarraybufferviewoutofbounds">IsArrayBufferViewOutOfBounds</dfn> abstract operation</li>
<li>The <dfn data-x-href="https://tc39.es/ecma262/#sec-isaccessordescriptor">IsAccessorDescriptor</dfn> abstract operation</li>
<li>The <dfn data-x-href="https://tc39.es/ecma262/#sec-iscallable">IsCallable</dfn> abstract operation</li>
Expand Down Expand Up @@ -104473,15 +104473,21 @@ interface <dfn interface>NotRestoredReasons</dfn> {
<var>origin</var>, <var>group</var>, and false.</p></li>

<li>
<p>Let <var>realm execution context</var> be the result of <span>creating a new realm</span>
given <var>agent</var> and the following customizations:</p>
<p>Let <var>customizations</var> be the following algorithm given a realm <var>realm</var>:</p>

<ul>
<li><p>For the global object, create a new <code>Window</code> object.</p></li>
<ol>
<li>Let <var>global</var> be a new <code>Window</code> object.</li>

<li><p>For the global <b>this</b> binding, use <var>browsingContext</var>'s
<code>WindowProxy</code> object.</li>
</ul>
<li>Let <var>globalThisBinding</var> be <var>browsingContext</var>'s <code>WindowProxy</code>
object.</li>

<li>Return « <var>global</var>, <var>globalThisBinding</var> ».</li>
</ol>
</li>

<li>
<p>Let <var>realm execution context</var> be the result of <span>creating a new realm</span>
given <var>agent</var> and <var>customizations</var>.</p>
</li>

<li><p>Let <var>topLevelCreationURL</var> be <code>about:blank</code> if <var>embedder</var> is
Expand Down Expand Up @@ -111268,15 +111274,21 @@ location.href = '#foo';</code></pre>
<var>requestsOAC</var>.</p></li>

<li>
<p>Let <var>realmExecutionContext</var> be the result of <span>creating a new realm</span>
given <var>agent</var> and the following customizations:</p>
<p>Let <var>customizations</var> be the following algorithm given a realm <var>realm</var>:</p>

<ul>
<li><p>For the global object, create a new <code>Window</code> object.</p></li>
<ol>
<li>Let <var>global</var> be a new <code>Window</code> object.</li>

<li><p>For the global <b>this</b> binding, use <var>browsingContext</var>'s
<code>WindowProxy</code> object.</p></li>
</ul>
<li>Let <var>globalThisBinding</var> be <var>browsingContext</var>'s <code>WindowProxy</code>
object.</li>

<li>Return « <var>global</var>, <var>globalThisBinding</var> ».</li>
</ol>
</li>

<li>
<p>Let <var>realmExecutionContext</var> be the result of <span>creating a new realm</span>
given <var>agent</var> and <var>customizations</var>.</p>
</li>

<li><p>Set <var>window</var> to the <span data-x="concept-realm-global">global
Expand Down Expand Up @@ -115430,24 +115442,12 @@ new PaymentRequest(&hellip;); // Allowed to use

<div algorithm>
<p>To <dfn data-x="creating a new realm" export id="creating-a-new-javascript-realm">create a new
realm</dfn> in an <span>agent</span> <var>agent</var>, optionally with instructions to create a
global object or a global <b>this</b> binding (or both), the following steps are taken:</p>
realm</dfn> in an <span>agent</span> <var>agent</var>, with a customizations algorithm
<var>customizations</var>, the following steps are taken:</p>

<ol>
<li><p>Perform <span data-x="js-InitializeHostDefinedRealm">InitializeHostDefinedRealm</span>()
with the provided customizations for creating the global object and the global <b>this</b>
binding.</p></li>

<li>
<p>Let <var>realm execution context</var> be the <span>running JavaScript execution
context</span>.</p>

<p class="note">This is the <span>JavaScript execution context</span> created in the previous
step.</p>
</li>

<li><p>Remove <var>realm execution context</var> from the <span>JavaScript execution context
stack</span>.</p></li>
<li><p>Let <var>realm execution context</var> be <span
data-x="js-MakeRealm">MakeRealm</span>(<var>customizations</var>).</p></li>

<li><p>Let <var>realm</var> be <var>realm execution context</var>'s Realm component.</p></li>

Expand Down Expand Up @@ -130657,14 +130657,18 @@ interface <dfn interface>SharedWorkerGlobalScope</dfn> : <span>WorkerGlobalScope
<var>is shared</var>. Run the rest of these steps in that agent.</p></li>

<li>
<p>Let <var>realm execution context</var> be the result of <span>creating a new realm</span>
given <var>agent</var> and the following customizations:</p>
<p>Let <var>customizations</var> be the following algorithm given a realm <var>realm</var>:</p>

<ul>
<li><p>For the global object, if <var>is shared</var> is true, create a new
<code>SharedWorkerGlobalScope</code> object. Otherwise, create a new
<code>DedicatedWorkerGlobalScope</code> object.</p></li>
</ul>
<ol>
<li>Let <var>global</var> be a new <code>SharedWorkerGlobalScope</code> object if <var>is shared</var> is true; otherwise a new <code>DedicatedWorkerGlobalScope</code> object.</li>

<li>Return « <var>global</var>, undefined ».</li>
</ol>
</li>

<li>
<p>Let <var>realm execution context</var> be the result of <span>creating a new realm</span>
given <var>agent</var> and <var>customizations</var>.</p>
</li>

<li>
Expand Down Expand Up @@ -132229,13 +132233,19 @@ interface <dfn interface>WorkletGlobalScope</dfn> {};</code></pre>
agent.</p></li>

<li>
<p>Let <var>realmExecutionContext</var> be the result of <span>creating a new realm</span> given
<var>agent</var> and the following customizations:</p>
<p>Let <var>customizations</var> be the following algorithm given a realm <var>realm</var>:</p>

<ul>
<li><p>For the global object, create a new object of the type given by <var>worklet</var>'s
<span>worklet global scope type</span>.</p></li>
</ul>
<ol>
<li>Let <var>global</var> be a new object of the type given by <var>worklet</var>'s
<span>worklet global scope type</span>.</li>

<li>Return « <var>global</var>, undefined ».</li>
</ol>
</li>

<li>
<p>Let <var>realmExecutionContext</var> be the result of <span>creating a new realm</span> given
<var>agent</var> and <var>customizations</var>.</p>
</li>

<li><p>Let <var>workletGlobalScope</var> be the <span data-x="concept-realm-global">global
Expand Down