fix(dom): keep child document base URI live

moli-renderer-v8/src/native_bridge/context_host/child_frame_runtime/document.rs

@@ -8,7 +8,7 @@ use crate::native_bridge::{
     document::detached_native_handle_for_runtime, node::remove_child_to_current_reaction_queue,
     throw_dom_exception,
 };
-use crate::util::{context_host_ptr_from_global_bridge, set_private_value, v8_string, v8str};
+use crate::util::{context_host_ptr_from_global_bridge, set_private_value, v8str};
 use moli_webapi_declare::WebApiObject;
 use url::Url;
 
@@ -248,31 +248,6 @@ fn install_child_document_stream_methods<'s>(
             child_document_native_handle_for_runtime(scope, runtime_ptr, document)
     {
         let runtime = unsafe { &mut *runtime_ptr };
-        let base_url = runtime
-            .child_browsing_context_base_url(handle)
-            .map(|base_url| {
-                if moli_url::is_about_blank(&base_url)
-                    && runtime
-                        .child_browsing_context_current_url(handle)
-                        .as_ref()
-                        .is_some_and(moli_url::is_about_blank)
-                    && runtime.child_browsing_context_inherits_parent_origin(handle)
-                {
-                    runtime.document_base_url_for_child_context(handle)
-                } else {
-                    base_url
-                }
-            });
-        if let Some(base_url) = base_url
-            && let Some(value) = v8_string(scope, base_url.as_str())
-        {
-            crate::native_bridge::helpers::set_object_slot(
-                scope,
-                document,
-                "baseURI",
-                value.into(),
-            );
-        }
         if !runtime.dom_host().is_connected(document_handle) {
             runtime
                 .dom_host_mut()

moli-renderer-v8/src/script_vm/tests/dom_xhr/dom.rs

@@ -1413,6 +1413,39 @@ fn detached_child_document_anchor_resolves_url_properties() {
         "about:blank|https://child-window-anchor.test/path/page.html|[object HTMLAnchorElement]|false|true|true|https://child-window-anchor.test/item?id=1#frag|https:|child-window-anchor.test|child-window-anchor.test||/item|?id=1|#frag|/"
     );
 }
+
+#[test]
+fn child_document_base_uri_tracks_connected_base_href_mutations() {
+    let mut vm = new_storage_test_vm("https://child-base-uri.test/path/page.html");
+
+    let result = vm
+        .eval(
+            r#"
+(() => {
+  const frame = document.createElement('iframe');
+  (document.body || document.documentElement || document).appendChild(frame);
+  const childDocument = frame.contentDocument;
+  const base = childDocument.body.appendChild(childDocument.createElement('base'));
+  const before = childDocument.baseURI;
+  base.href = 'sub/';
+  const image = childDocument.createElement('img');
+  image.src = 'asset.png';
+  return JSON.stringify({
+    before,
+    after: childDocument.baseURI,
+    image: image.src,
+    ownsBaseUri: Object.prototype.hasOwnProperty.call(childDocument, 'baseURI')
+  });
+})()
+"#,
+        )
+        .expect("child document base URL should remain live");
+
+    assert_eq!(
+        result,
+        r#"{"before":"https://child-base-uri.test/path/page.html","after":"https://child-base-uri.test/path/sub/","image":"https://child-base-uri.test/path/sub/asset.png","ownsBaseUri":false}"#
+    );
+}
 #[test]
 fn detached_html_elements_use_specific_prototypes_for_common_tags() {
     let mut vm = new_storage_test_vm("https://detached-html-element-prototypes.test/");