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   <title>HTML Sanitizer API</title>
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    <p data-fill-with="logo"><a class="logo" href="https://www.w3.org/"> <img alt="W3C" height="48" src="https://www.w3.org/StyleSheets/TR/2021/logos/W3C" width="72"> </a> </p>
    <h1 class="p-name no-ref" id="title">HTML Sanitizer API</h1>
-   <p id="w3c-state"><a href="https://www.w3.org/standards/types#CG-DRAFT">Draft Community Group Report</a>, <time class="dt-updated" datetime="2024-05-27">27 May 2024</time></p>
+   <p id="w3c-state"><a href="https://www.w3.org/standards/types#CG-DRAFT">Draft Community Group Report</a>, <time class="dt-updated" datetime="2024-05-29">29 May 2024</time></p>
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      <dt>This version:
@@ -1816,18 +1816,15 @@ <h3 class="heading settled" data-level="4.4" id="mutated-xss"><span class="secno
 into a different parent element. An example for carrying out such an attack
 is by relying on the change of parsing behavior for foreign content or
 mis-nested tags.</p>
-   <p>The Sanitizer API offers help against Mutated XSS, but relies on some amount of
-cooperation by the developers. The <code>sanitize()</code> function does not handle strings
-and is therefore unaffected. The <code>setHTML</code> function combines sanitization
-with DOM modification and can implicitly apply the correct context. The <code>sanitizeFor()</code> function combines parsing and sanitization, and relies on the
-developer to supply the correct context for the eventual application of its
-result.</p>
-   <p>If the data to be sanitized is available as a node tree, we encourage authors
-to use the <code>sanitize()</code> function of the API which returns a
-DocumentFragment and avoids risks that come with serialization and additional
-parsing. Directly operating on a fragment after sanitization also comes with a
-performance benefit, as the cost of additional serialization and parsing is
-avoided.</p>
+   <p>The Sanitizer API offers only functions that turn a string into a node tree.
+The context is supplied implicitly by all sanitizer functions: <code>Element.setHTML()</code> uses the current element; <code>Document.parseHTML()</code> creates a
+new document. Therefore Sanitizer API is not directly affected by mutated XSS.</p>
+   <p>If a developer were to retrieve a sanitized node tree as a string, e.g. via <code>.innerHTML</code>, and to then parse it again then mutated XSS may occur.
+We discourage this practice. If processing or passing of HTML as a
+string should be necessary after all, then any string should be considered
+untrusted and should be sanitized (again) when inserting it into the DOM. In
+other words, a sanitized and then serialized HTML tree can no
+longer be considered as sanitized.</p>
    <p>A more complete treatment of mXSS can be found in <a data-link-type="biblio" href="#biblio-mxss" title="mXSS Attacks: Attacking well-secured Web-Applications by using innerHTML Mutations">[MXSS]</a>.</p>
    <h2 class="heading settled" data-level="5" id="ack"><span class="secno">5. </span><span class="content">Acknowledgements</span><a class="self-link" href="#ack"></a></h2>
    <p>Cure53’s <a data-link-type="biblio" href="#biblio-dompurify" title="DOMPurify">[DOMPURIFY]</a> is a clear inspiration for the API this document