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Allow the creation of null registry element and shadow root #1424

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Allow the creation of null registry element and shadow root #1424

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8226ff4
Allow the creation of null registry element and shadowroot
Nov 19, 2025
8e91092
Address nit
Nov 19, 2025
f278889
Condition on custom element registry exist in attachShadow
Nov 21, 2025
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33 changes: 14 additions & 19 deletions dom.bs
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Original file line number Diff line number Diff line change
Expand Up @@ -5475,7 +5475,7 @@ interface Document : Node {
interface XMLDocument : Document {};

dictionary ElementCreationOptions {
CustomElementRegistry customElementRegistry;
CustomElementRegistry? customElementRegistry;
DOMString is;
};

Expand Down Expand Up @@ -5847,7 +5847,8 @@ method steps are to return the result of running the
dictionary <var>options</var> and a <a for=/>document</a> <var>document</var>:

<ol>
<li><p>Let <var>registry</var> be null.
<li><p>Let <var>registry</var> be the result of <a for=/>looking up a custom element registry</a>
given <var>document</var>.

<li><p>Let <var>is</var> be null.

Expand All @@ -5858,9 +5859,10 @@ dictionary <var>options</var> and a <a for=/>document</a> <var>document</var>:
<li><p>If <var>options</var>["{{ElementCreationOptions/customElementRegistry}}"]
<a for=map>exists</a>, then set <var>registry</var> to it.

<li><p>If <var>registry</var>'s <a for=CustomElementRegistry>is scoped</a> is false and
<var>registry</var> is not <var>document</var>'s <a for=Document>custom element registry</a>,
then <a>throw</a> a "{{NotSupportedError!!exception}}" {{DOMException}}.
<li><p>If <var>registry</var> is non-null, and <var>registry</var>'s
<a for=CustomElementRegistry>is scoped</a> is false, and <var>registry</var> is not
<var>document</var>'s <a for=Document>custom element registry</a>, then <a>throw</a> a
"{{NotSupportedError!!exception}}" {{DOMException}}.

<li><p>If <var>options</var>["{{ElementCreationOptions/is}}"] <a for=map>exists</a>, then set
<var>is</var> to it.
Expand All @@ -5869,9 +5871,6 @@ dictionary <var>options</var> and a <a for=/>document</a> <var>document</var>:
"{{NotSupportedError!!exception}}" {{DOMException}}.
</ol>

<li><p>If <var>registry</var> is null, then set <var>registry</var> to the result of
<a for=/>looking up a custom element registry</a> given <var>document</var>.

<li><p>Return <var>registry</var> and <var>is</var>.
</ol>

Expand Down Expand Up @@ -6672,7 +6671,7 @@ dictionary ShadowRootInit {
SlotAssignmentMode slotAssignment = "named";
boolean clonable = false;
boolean serializable = false;
CustomElementRegistry? customElementRegistry = null;
CustomElementRegistry? customElementRegistry;
};
</pre>

Expand Down Expand Up @@ -7604,17 +7603,13 @@ are:
<li><p>Let <var>registry</var> be <a>this</a>'s <a>node document</a>'s
<a for=Document>custom element registry</a>.

<li>
<p>If <var>init</var>["{{ShadowRootInit/customElementRegistry}}"] is non-null:
<li><p>If <var>init</var>["{{ShadowRootInit/customElementRegistry}}"] <a for=map>exists</a>, then
set <var>registry</var> to it.

<ol>
<li><p>Set <var>registry</var> to <var>init</var>["{{ShadowRootInit/customElementRegistry}}"].

<li><p>If <var>registry</var>'s <a for=CustomElementRegistry>is scoped</a> is false and
<var>registry</var> is not <a>this</a>'s <a>node document</a>'s
<a for=Document>custom element registry</a>, then <a>throw</a> a
"{{NotSupportedError!!exception}}" {{DOMException}}.
</ol>
<li><p>If <var>registry</var> is non-null, and <var>registry</var>'s
<a for=CustomElementRegistry>is scoped</a> is false, and <var>registry</var> is not <a>this</a>'s
<a>node document</a>'s <a for=Document>custom element registry</a>, then <a>throw</a> a
"{{NotSupportedError!!exception}}" {{DOMException}}.

<li><p>Run <a>attach a shadow root</a> with <a>this</a>,
<var>init</var>["{{ShadowRootInit/mode}}"], <var>init</var>["{{ShadowRootInit/clonable}}"],
Expand Down