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diff --git a/dom/webidl/LoadURIOptions.webidl b/dom/webidl/LoadURIOptions.webidl
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+++ b/dom/webidl/LoadURIOptions.webidl
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+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+interface ContentSecurityPolicy;
+interface Principal;
+interface URI;
+interface InputStream;
+interface ReferrerInfo;
+
+/**
+ * This dictionary holds load arguments for docshell loads.
+ */
+[GenerateInit]
+dictionary LoadURIOptions {
+  /**
+   * The principal that initiated the load.
+   */
+  Principal? triggeringPrincipal = null;
+
+  /**
+   * The CSP to be used for the load. That is *not* the CSP that will
+   * be applied to subresource loads within that document but the CSP
+   * for the document load itself. E.g. if that CSP includes
+   * upgrade-insecure-requests, then the new top-level load will
+   * be upgraded to HTTPS.
+   */
+  ContentSecurityPolicy? csp = null;
+
+  /**
+   * Flags modifying load behaviour.  This parameter is a bitwise
+   * combination of the load flags defined in nsIWebNavigation.idl.
+   */
+   long loadFlags = 0;
+
+  /**
+   * The referring info of the load.  If this argument is null, then the
+   * referrer URI and referrer policy will be inferred internally.
+   */
+   ReferrerInfo? referrerInfo = null;
+
+  /**
+   * If the URI to be loaded corresponds to a HTTP request, then this stream is
+   * appended directly to the HTTP request headers.  It may be prefixed
+   * with additional HTTP headers.  This stream must contain a "\r\n"
+   * sequence separating any HTTP headers from the HTTP request body.
+   */
+  InputStream? postData = null;
+
+  /**
+   * If the URI corresponds to a HTTP request, then any HTTP headers
+   * contained in this stream are set on the HTTP request.  The HTTP
+   * header stream is formatted as:
+   *     ( HEADER "\r\n" )*
+   */
+   InputStream? headers = null;
+
+  /**
+   * Set to indicate a base URI to be associated with the load. Note
+   * that at present this argument is only used with view-source aURIs
+   * and cannot be used to resolve aURI.
+   */
+  URI? baseURI = null;
+
+  /**
+   * Set to indicate that the URI to be loaded was triggered by a user
+   * action. (Mostly used in the context of Sec-Fetch-User).
+   */
+  boolean hasValidUserGestureActivation = false;
+
+
+  /**
+  * The SandboxFlags of the entity thats
+  * responsible for causing the load.
+  */
+  unsigned long triggeringSandboxFlags = 0;
+
+  /**
+   * The RemoteType of the entity that's responsible for the load. Defaults to
+   * the current process.
+   *
+   * When starting a load in a content process, `triggeringRemoteType` must be
+   * either unset, or match the current remote type.
+   */
+  UTF8String? triggeringRemoteType;
+
+  /**
+   * If non-0, a value to pass to nsIDocShell::setCancelContentJSEpoch
+   * when initiating the load.
+   */
+  long cancelContentJSEpoch = 0;
+
+  /**
+   * If this is passed, it will control which remote type is used to finish this
+   * load. Ignored for non-`about:` loads.
+   *
+   * NOTE: This is _NOT_ defaulted to `null`, as `null` is the value for
+   * `NOT_REMOTE_TYPE`, and we need to determine the difference between no
+   * `remoteTypeOverride` and a `remoteTypeOverride` of `NOT_REMOTE_TYPE`.
+   */
+  UTF8String? remoteTypeOverride;
+};