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[Origin API] Define an Origin interface. (#11534) #11846

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annevk merged 7 commits into from
Dec 4, 2025
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[Origin API] Define an Origin interface. (#11534) #11846

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9d56f34
[Origin API] Define an `Origin` interface. (#11534)
mikewest Oct 29, 2025
b0fdce5
fixup @annevk's feedback
mikewest Nov 7, 2025
2904ac2
fixup closes origin-api/issues#11
mikewest Nov 19, 2025
37fa923
fixup more feedback
mikewest Nov 19, 2025
2d77ad2
fixup drop location and workerlocation
mikewest Nov 21, 2025
a85adea
many nits
annevk Dec 3, 2025
0111175
Update source
annevk Dec 3, 2025
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Original file line number Diff line number Diff line change
Expand Up @@ -26062,6 +26062,19 @@ document.body.appendChild(wbr);</code></pre>
<p>An element implementing the <code>HTMLHyperlinkElementUtils</code> mixin has an associated <dfn
data-x="concept-hyperlink-url">url</dfn> (null or a <span>URL</span>). It is initially null.

<div algorithm>
<p>An element implementing the <code>HTMLHyperlinkElementUtils</code> mixin has the following
<span>extract an origin</span> steps:</p>

<ol>
<li><p>If <span>this</span>'s <span data-x="concept-hyperlink-url">url</span> is null, then
return null.</p></li>

<li><p>Return <span>this</span>'s <span data-x="concept-hyperlink-url">url</span>'s
<span data-x="concept-url-origin">origin</span>.</p></li>
</ol>
</div>

<div algorithm>
<p>An element implementing the <code>HTMLHyperlinkElementUtils</code> mixin has an associated <dfn
data-x="concept-hyperlink-url-set">set the url</dfn> algorithm, which runs these steps:</p>
Expand Down Expand Up @@ -92415,6 +92428,99 @@ dictionary <dfn dictionary>DragEventInit</dfn> : <span>MouseEventInit</span> {

</div>

<h5>The <code data-x="dom-Origin-interface">Origin</code> interface</h5>

<p>The <code data-x="dom-Origin-interface">Origin</code> interface represents an
<span>origin</span>, allowing robust <span>same origin</span> and <span>same site</span>
comparisons.</p>

<pre><code class="idl">[Exposed=*]
interface <dfn interface data-x="dom-Origin-interface">Origin</dfn> {
<span data-x="dom-Origin-constructor">constructor</span>();

static <span data-x="dom-Origin-interface">Origin</span> <span data-x="dom-Origin-from">from</span>(any <var ignore>value</var>);

readonly attribute boolean <span data-x="dom-Origin-opaque">opaque</span>;

boolean <span data-x="dom-Origin-isSameOrigin">isSameOrigin</span>(<span data-x="dom-Origin-interface">Origin</span> <var ignore>other</var>);
boolean <span data-x="dom-Origin-isSameSite">isSameSite</span>(<span data-x="dom-Origin-interface">Origin</span> <var ignore>other</var>);
};</code></pre>

<p><code data-x="dom-Origin-interface">Origin</code> objects have an associated <dfn for="Origin"
data-x="concept-Origin-origin">origin</dfn>, which holds an <span>origin</span>.</p>

<p><span data-x="platform object">Platform objects</span> have an <dfn for="platform object"
export>extract an origin</dfn> operation, which returns null unless otherwise specified.</p>

<div algorithm>
<p>Objects implementing the <code data-x="dom-Origin-interface">Origin</code> interface's
<span>extract an origin</span> steps are to return <span>this</span>'s <span
data-x="concept-Origin-origin">origin</span>.</p>
</div>

<div algorithm>
<p>The <dfn constructor for="Origin"><code
data-x="dom-Origin-constructor">new Origin()</code></dfn> constructor steps are to set
<span>this</span>'s <span data-x="concept-Origin-origin">origin</span> to a unique <span
data-x="concept-origin-opaque">opaque origin</span>.</p>
</div>

<div algorithm>
<p>The static <dfn method for="Origin"><code
data-x="dom-Origin-from">from(<var>value</var>)</code></dfn> method steps are:</p>

<ol>
<li>
<p>If <var>value</var> is a <span>platform object</span>:</p>
<ol>
<li><p>Let <var>origin</var> be the result of executing <var>value</var>'s <span>extract an
origin</span> operation.</p></li>

<li><p>If <var>origin</var> is not null, then return a new <code
data-x="dom-Origin-interface">Origin</code> object whose <span
data-x="concept-Origin-origin">origin</span> is <var>origin</var>.</p></li>
</ol>
</li>

<li>
<p>If <var>value</var> is a <span>string</span>:</p>
<ol>
<li><p>Let <var>parsedURL</var> be the result of <span data-x="basic url parser">basic URL
parsing</span> <var>value</var>.</p></li>

<li><p>If <var>parsedURL</var> is not failure, then return a new <code
data-x="dom-Origin-interface">Origin</code> object whose <span
data-x="concept-Origin-origin">origin</span> is set to <var>parsedURL</var>'s <span
data-x="concept-url-origin">origin</span>.</p></li>
</ol>
</li>

<li><p>Throw a <code>TypeError</code>.</p></li>
</ol>
</div>

<div algorithm>
<p>The <dfn attribute for="Origin"><code data-x="dom-Origin-opaque">opaque</code></dfn> getter
steps are to return true if <span>this</span>'s <span data-x="concept-Origin-origin">origin</span>
is an <span data-x="concept-origin-opaque">opaque origin</span>; otherwise false.</p>
</div>

<div algorithm>
<p>The <dfn method for="Origin"><code
data-x="dom-Origin-isSameOrigin">isSameOrigin(<var>other</var>)</code></dfn> method steps are to
return true if <span>this</span>'s <span data-x="concept-Origin-origin">origin</span> is
<span>same origin</span> with <var>other</var>'s <span
data-x="concept-Origin-origin">origin</span>; otherwise false.</p>
</div>

<div algorithm>
<p>The <dfn method for="Origin"><code
data-x="dom-Origin-isSameSite">isSameSite(<var>other</var>)</code></dfn> method steps are to
return true if <span>this</span>'s <span data-x="concept-Origin-origin">origin</span> is
<span>same site</span> with <var>other</var>'s <span data-x="concept-Origin-origin">origin</span>;
otherwise false.</p>
</div>


<h4><span id="origin-isolation"></span>Origin-keyed agent clusters</h4>

Expand Down Expand Up @@ -123029,6 +123135,24 @@ document.body.appendChild(frame)</code></pre>
capability</span>.</p>
</div>

<div algorithm>
<p>An element implementing the <code>WindowOrWorkerGlobalScope</code> mixin has the following
<span>extract an origin</span> steps:</p>

<ol>
<li><p>If <span>this</span>'s <span>relevant settings object</span>'s <span
data-x="concept-settings-object-origin">origin</span> is not <span>same origin-domain</span>
with the <span>entry settings object</span>'s <span
data-x="concept-settings-object-origin">origin</span>, then return null.</p></li>

<li><p>Return <span>this</span>'s return <span>this</span>'s <span>relevant settings
object</span>'s <span data-x="concept-settings-object-origin">origin</span>.</p></li>
</ol>

<p class="note">Since these objects are potentially accessible cross-origin (e.g., through
<code>WindowProxy</code>), we need a security check here before granting access to the origin.</p>
</div>

</div>


Expand Down Expand Up @@ -127539,6 +127663,12 @@ typedef (<span>WindowProxy</span> or <span>MessagePort</span> or <span>ServiceWo
<span data-x="concept-url-fragment">fragment</span>).</p>
</div>

<div algorithm>
<p>Objects implementing the <code>MessageEvent</code> interface's <span>extract an origin</span>
steps are to return <span>this</span>'s <span>relevant settings object</span>'s
<span data-x="concept-settings-object-origin">origin</span>.</p>
</div>

<div algorithm>
<p>The <dfn attribute for="MessageEvent"><code
data-x="dom-MessageEvent-lastEventId">lastEventId</code></dfn> attribute must return the value it
Expand Down