LibWeb: Stub out "focus-without-user-activation" feature policy

For now this always returns that focus is allowed, as that matches our
previous behavior.

Corresponds to d7053d86ad

Libraries/LibWeb/DOM/Document.cpp

@@ -3418,6 +3418,24 @@ bool Document::has_focus() const
     return true;
 }
 
+// https://html.spec.whatwg.org/multipage/interaction.html#allow-focus-steps
+bool Document::allow_focus() const
+{
+    // The allow focus steps, given a Document object target, are as follows:
+
+    // 1. If target is allowed to use the "focus-without-user-activation" feature, then return true.
+    if (is_allowed_to_use_feature(PolicyControlledFeature::FocusWithoutUserActivation))
+        return true;
+
+    // FIXME: 2. If any of the following are true:
+    //    - target's relevant global object has transient user activation; or
+    //    - target's node navigable's container, if any, is marked as locked for focus,
+    //    then return true.
+
+    // 3. Return false.
+    return false;
+}
+
 void Document::set_parser(Badge<HTML::HTMLParser>, HTML::HTMLParser& parser)
 {
     m_parser = parser;
@@ -4295,6 +4313,9 @@ bool Document::is_allowed_to_use_feature(PolicyControlledFeature feature) const
         if (PermissionsPolicy::AutoplayAllowlist::the().is_allowed_for_origin(*this, origin()) == PermissionsPolicy::Decision::Enabled)
             return true;
         break;
+    case PolicyControlledFeature::FocusWithoutUserActivation:
+        // FIXME: Implement allowlist for this.
+        return true;
     }
 
     // 4. Return false.

Libraries/LibWeb/DOM/Document.h

@@ -154,8 +154,9 @@ struct ElementCreationOptions {
     Optional<String> is;
 };
 
-enum class PolicyControlledFeature {
+enum class PolicyControlledFeature : u8 {
     Autoplay,
+    FocusWithoutUserActivation,
 };
 
 class Document
@@ -552,6 +553,8 @@ public:
 
     bool has_focus() const;
 
+    bool allow_focus() const;
+
     void set_parser(Badge<HTML::HTMLParser>, HTML::HTMLParser&);
     void detach_parser(Badge<HTML::HTMLParser>);
 

Libraries/LibWeb/HTML/HTMLDialogElement.cpp

@@ -1,6 +1,6 @@
 /*
  * Copyright (c) 2020, the SerenityOS developers.
- * Copyright (c) 2024, Sam Atkins <sam@ladybird.org>
+ * Copyright (c) 2024-2025, Sam Atkins <sam@ladybird.org>
  *
  * SPDX-License-Identifier: BSD-2-Clause
  */
@@ -16,6 +16,7 @@
 #include <LibWeb/HTML/Focus.h>
 #include <LibWeb/HTML/HTMLDialogElement.h>
 #include <LibWeb/HTML/ToggleEvent.h>
+#include <LibWeb/HTML/TraversableNavigable.h>
 
 namespace Web::HTML {
 
@@ -406,18 +407,32 @@ void HTMLDialogElement::set_close_watcher()
 // https://html.spec.whatwg.org/multipage/interactive-elements.html#dialog-focusing-steps
 void HTMLDialogElement::run_dialog_focusing_steps()
 {
-    // 1. Let control be null
+    // 1. If the allow focus steps given subject's node document return false, then return.
+    if (!document().allow_focus())
+        return;
+
+    // 2. Let control be null
     GC::Ptr<Element> control = nullptr;
 
-    // FIXME 2. If subject has the autofocus attribute, then set control to subject.
-    // FIXME 3. If control is null, then set control to the focus delegate of subject.
+    // FIXME 3. If subject has the autofocus attribute, then set control to subject.
+    // FIXME 4. If control is null, then set control to the focus delegate of subject.
 
-    // 4. If control is null, then set control to subject.
+    // 5. If control is null, then set control to subject.
     if (!control)
         control = this;
 
-    // 5. Run the focusing steps for control.
+    // 6. Run the focusing steps for control.
     run_focusing_steps(control);
+
+    // 7. Let topDocument be control's node navigable's top-level traversable's active document.
+    auto top_document = control->navigable()->top_level_traversable()->active_document();
+
+    // 8. If control's node document's origin is not the same as the origin of topDocument, then return.
+    if (!control->document().origin().is_same_origin(top_document->origin()))
+        return;
+
+    // FIXME: 9. Empty topDocument's autofocus candidates.
+    // FIXME: 10. Set topDocument's autofocus processed flag to true.
 }
 
 }

Libraries/LibWeb/HTML/HTMLOrSVGElement.cpp

@@ -26,24 +26,28 @@ GC::Ref<DOMStringMap> HTMLOrSVGElement<ElementBase>::dataset()
 template<typename ElementBase>
 void HTMLOrSVGElement<ElementBase>::focus()
 {
-    // FIXME: below are the focus(options) steps, also implement focus()
+    // 1. If the allow focus steps given the element's node document return false, then return.
+    if (!static_cast<ElementBase*>(this)->document().allow_focus())
+        return;
 
-    // 1. If the element is marked as locked for focus, then return.
+    // 2. If the element is marked as locked for focus, then return.
     if (m_locked_for_focus)
         return;
 
-    // 2. Mark the element as locked for focus.
+    // 3. Mark the element as locked for focus.
     m_locked_for_focus = true;
 
-    // 3. Run the focusing steps for the element.
+    // 4. Run the focusing steps for the element.
     run_focusing_steps(static_cast<ElementBase*>(this));
 
-    // FIXME: 4. If the value of the preventScroll dictionary member of options is false,
+    // FIXME: 5. If the value of the focusVisible dictionary member of options is true, or is not present but in an implementation-defined way the user agent determines it would be best to do so, then indicate focus.
+
+    // FIXME: 6. If the value of the preventScroll dictionary member of options is false,
     //           then scroll the element into view with scroll behavior "auto",
     //           block flow direction position set to an implementation-defined value,
     //           and inline base direction position set to an implementation-defined value.
 
-    // 5. Unmark the element as locked for focus.
+    // 7. Unmark the element as locked for focus.
     m_locked_for_focus = false;
 }
 

Libraries/LibWeb/HTML/Window.cpp

@@ -910,12 +910,16 @@ void Window::focus()
     if (!current)
         return;
 
-    // 3. Run the focusing steps with current.
+    // 3. If the allow focus steps given current's active document return false, then return.
+    if (!document()->allow_focus())
+        return;
+
+    // 4. Run the focusing steps with current.
     // FIXME: We should pass in the browsing context itself instead of the active document, however the focusing steps don't currently accept browsing contexts.
     //        Passing in a browsing context always makes it resolve to its active document for focus, so this is fine for now.
     run_focusing_steps(current->active_document());
 
-    // FIXME: 4. If current is a top-level traversable, user agents are encouraged to trigger some sort of notification to
+    // FIXME: 5. If current is a top-level traversable, user agents are encouraged to trigger some sort of notification to
     //           indicate to the user that the page is attempting to gain focus.
 }