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Account for a cloned document's base URL #12674

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Original file line number Diff line number Diff line change
Expand Up @@ -3400,6 +3400,8 @@ a.setAttribute('href', 'https://example.com/'); // change the content attribute
<dfn data-x="document-custom-element-registry" data-x-href="https://dom.spec.whatwg.org/#document-custom-element-registry">custom element registry</dfn>,
<dfn data-x="concept-document-allow-declarative-shadow-roots" data-x-href="https://dom.spec.whatwg.org/#concept-document-allow-declarative-shadow-roots">allow declarative shadow roots</dfn>, and
<dfn data-x="concept-document-content-type" data-x-href="https://dom.spec.whatwg.org/#concept-document-content-type">content type</dfn> of a <code>Document</code></li>
<li>The <dfn data-x-href="https://dom.spec.whatwg.org/#get-the-base-url">get the base URL</dfn> algorithm and
<dfn data-x-href="https://dom.spec.whatwg.org/#base-url-override">base URL override</dfn> of a <code>Document</code></li>
<li>The distinction between <dfn data-x-href="https://dom.spec.whatwg.org/#xml-document">XML documents</dfn> and
<dfn data-x-href="https://dom.spec.whatwg.org/#html-document">HTML documents</dfn></li>
<li>The terms <dfn data-x-href="https://dom.spec.whatwg.org/#concept-document-quirks">quirks mode</dfn>,
Expand Down Expand Up @@ -7755,16 +7757,29 @@ a.setAttribute('href', 'https://example.com/'); // change the content attribute
<span>URL record</span> obtained by running these steps:</p>

<ol>
<li><p>If <var>document</var> has no <span>descendant</span> <code>base</code> element that has
an <code data-x="attr-base-href">href</code> attribute, then return <var>document</var>'s
<span>fallback base URL</span>.</p></li>
<li>
<p>If <var>document</var> has no <span>descendant</span> <code>base</code> element that has an
<code data-x="attr-base-href">href</code> attribute:</p>

<ol>
<li><p>If <var>document</var>'s <span>base URL override</span> is non-null, then return
<var>document</var>'s <span>base URL override</span>.</p></li>

<li><p>Otherwise, return the <span>frozen base URL</span> of the first <code>base</code> element
in <var>document</var> that has an <code data-x="attr-base-href">href</code> attribute, in
<li><p>Return <var>document</var>'s <span>fallback base URL</span>.</p></li>
</ol>
</li>

<li><p>Return the <span>frozen base URL</span> of the first <code>base</code> element in
<var>document</var> that has an <code data-x="attr-base-href">href</code> attribute, in
<span>tree order</span>.</p></li>
</ol>
</div>

<div algorithm>
<p>A <code>Document</code> <var>document</var>'s <span>get the base URL</span> algorithm returns
<var>document</var>'s <span>document base URL</span>.</p>
</div>

<div algorithm>
<p>The <dfn>fallback base URL</dfn> of a <code>Document</code> object <var>document</var> is the
<span>URL record</span> obtained by running these steps:</p>
Expand Down
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