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annevk merged 2 commits into from
May 26, 2026
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HTML integration for "Error Stack Accessor" TC39 Proposal #12239

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HTML integration for "Error Stack Accessor" TC39 Proposal
ljharb Mar 3, 2026
0b68000
Address review feedback
ljharb May 19, 2026
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25 changes: 14 additions & 11 deletions source
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Original file line number Diff line number Diff line change
Expand Up @@ -10435,17 +10435,15 @@ interface <dfn interface>DOMStringList</dfn> {
<span>IsDataDescriptor</span>(<var>valueMessageDesc</var>) is false, and
? <span>ToString</span>(<var>valueMessageDesc</var>.[[Value]]) otherwise.</p></li>

<li><p>Set <var>serialized</var> to { [[Type]]: "Error", [[Name]]: <var>name</var>,
[[Message]]: <var>message</var> }.</p></li>
<li><p>Let <var>stack</var> be an <span>implementation-defined</span> string that
represents <var>value</var>.[[Stack]]. <ref>JSERRORSTACKACCESSOR</ref>
<ref>JSERRORSTACKS</ref></p></li>
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ljharb marked this conversation as resolved.

<li>
<p>User agents should attach a serialized representation of any interesting accompanying
data which are not yet specified, notably the <code data-x="">stack</code> property, to
<var>serialized</var>.</p>
Comment thread
ljharb marked this conversation as resolved.
<li><p>Set <var>serialized</var> to { [[Type]]: "Error", [[Name]]: <var>name</var>,
[[Message]]: <var>message</var>, [[Stack]]: <var>stack</var> }.</p></li>

<p class="note">See the <cite>Error Stacks</cite> proposal for in-progress work on specifying
this data. <ref>JSERRORSTACKS</ref></p>
</li>
<li><p>User agents should attach a serialized representation of any interesting accompanying
data which are not yet specified to <var>serialized</var>.</p></li>
</ol>
</li>

Expand Down Expand Up @@ -10897,7 +10895,7 @@ o.myself = o;</code></pre>
<li><p>Let <var>message</var> be <var>serialized</var>.[[Message]].</p></li>

<li><p>Set <var>value</var> to <span>OrdinaryObjectCreate</span>(<var>prototype</var>, «
[[ErrorData]] »).</p></li>
[[ErrorData]], [[Stack]] »).</p></li>

<li><p>Let <var>messageDesc</var> be <span>PropertyDescriptor</span> { [[Value]]:
<var>message</var>, [[Writable]]: true, [[Enumerable]]: false, [[Configurable]]: true
Expand All @@ -10907,6 +10905,8 @@ o.myself = o;</code></pre>
<span>OrdinaryDefineOwnProperty</span>(<var>value</var>, "<code data-x="">message</code>",
<var>messageDesc</var>).</p></li>

<li><p>Set <var>value</var>.[[Stack]] to <var>serialized</var>.[[Stack]].</p></li>

<li><p>Any interesting accompanying data attached to <var>serialized</var> should be
deserialized and attached to <var>value</var>.</p></li>
</ol>
Expand Down Expand Up @@ -157150,8 +157150,11 @@ INSERT INTERFACES HERE
<dt id="refsJPEG">[JPEG]</dt>
<dd><cite><a href="https://www.w3.org/Graphics/JPEG/jfif3.pdf">JPEG File Interchange Format</a></cite>, E. Hamilton.</dd>

<dt id="refsJSERRORSTACKACCESSOR">[JSERRORSTACKACCESSOR]</dt>
<dd><cite><a href="https://tc39.es/proposal-error-stack-accessor/">Error Stack Accessor</a></cite>. Ecma International.</dd>

<dt id="refsJSERRORSTACKS">[JSERRORSTACKS]</dt>
<dd>(Non-normative) <cite><a href="https://tc39.es/proposal-error-stacks/">Error Stacks</a></cite>. Ecma International.</dd>
<dd><cite><a href="https://tc39.es/proposal-error-stacks/">Error Stacks</a></cite>. Ecma International.</dd>

<dt id="refsJSDYNAMICCODEBRANDCHECKS">[JSDYNAMICCODEBRANDCHECKS]</dt>
<dd><cite><a href="https://tc39.es/proposal-dynamic-code-brand-checks/">Dynamic code brand checks</a></cite>. Ecma International.</dd>
Expand Down
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