Remove ElementInternals.shadowRoot

source

@@ -67306,8 +67306,6 @@ interface <dfn>ElementInternals</dfn> {
   boolean <span data-x="dom-ElementInternals-reportValidity">reportValidity</span>();
 
   readonly attribute <span>NodeList</span> <span data-x="dom-ElementInternals-labels">labels</span>;
-
-  readonly attribute <code>ShadowRoot</code>? <span data-x="dom-ElementInternals-shadowRoot">shadowRoot</span>;
 };
 
 ElementInternals includes <span>ARIAMixin</span>;
@@ -67407,12 +67405,6 @@ dictionary <dfn>ValidityStateFlags</dfn> {
    <var>internals</var>'s <span data-x="internals-target">target element</span>, which will be used
    unless the page author overrides them using the <code data-x="attr-aria-*">aria-*</code>
    attributes.</p></dd>
-
-   <dt><var>internals</var> . <code data-x="dom-ElementInternals-shadowRoot">shadowRoot</code></dt>
-   <dd><p>Returns the <code>ShadowRoot</code> for <var>internals</var>'s
-   <span data-x="internals-target">target element</span>, if the
-   <span data-x="internals-target">target element</span> is a <span>shadow host</span>, or null
-   otherwise.</p></dd>
   </dl>
 
   <p>Each <code>ElementInternals</code> has a <dfn data-x="internals-target">target element</dfn>,
@@ -67457,12 +67449,6 @@ dictionary <dfn>ValidityStateFlags</dfn> {
    <span data-x="internals-target">targeting</span> <var>element</var>, and return it.</p></li>
   </ol>
 
-  <p>The <dfn><code data-x="dom-ElementInternals-shadowRoot">shadowRoot</code></dfn> attribute on
-  the <code>ElementInternals</code> object must return the <code>ShadowRoot</code> for
-  <code>ElementInternals</code>'s <span data-x="internals-target">target element</span>, if the
-  <span data-x="internals-target">target element</span> is a <span>shadow host</span>, or null
-  otherwise.</p>
-
   <hr>
 
   <p>Each <span>form-associated custom element</span> has <dfn