diff --git a/ext/dom/lexbor/lexbor/css/log.c b/ext/dom/lexbor/lexbor/css/log.c
index e9b244a450dab..08f6fc4fc5a10 100644
--- a/ext/dom/lexbor/lexbor/css/log.c
+++ b/ext/dom/lexbor/lexbor/css/log.c
@@ -42,7 +42,6 @@ lxb_css_log_init(lxb_css_log_t *log, lexbor_mraw_t *mraw)
     status = lexbor_array_obj_init(&log->messages, 64,
                                    sizeof(lxb_css_log_message_t));
     if (status != LXB_STATUS_OK) {
-        memset(&log->mraw, 0, sizeof(lexbor_mraw_t));
         return status;
     }
 
diff --git a/ext/dom/lexbor/lexbor/css/syntax/syntax.c b/ext/dom/lexbor/lexbor/css/syntax/syntax.c
index 8d54345ee5d49..b148d8a043c15 100644
--- a/ext/dom/lexbor/lexbor/css/syntax/syntax.c
+++ b/ext/dom/lexbor/lexbor/css/syntax/syntax.c
@@ -152,7 +152,6 @@ lxb_css_syntax_ident_serialize(const lxb_char_t *data, size_t length,
 
     static const lexbor_str_t str_s = lexbor_str("\\");
 
-    p = data;
     end = data + length;
     hex_map = lexbor_str_res_char_to_two_hex_value_lowercase;
 
diff --git a/ext/dom/lexbor/lexbor/css/syntax/tokenizer.c b/ext/dom/lexbor/lexbor/css/syntax/tokenizer.c
index e8a8802e52983..f0a38f843c028 100644
--- a/ext/dom/lexbor/lexbor/css/syntax/tokenizer.c
+++ b/ext/dom/lexbor/lexbor/css/syntax/tokenizer.c
@@ -232,7 +232,7 @@ lxb_css_syntax_tokenizer_cache_expand(lxb_css_syntax_tokenizer_cache_t *cache,
     new_size = cache->length + up_to;
     list = lexbor_realloc(cache->list,
                           sizeof(lxb_css_syntax_token_t *) * new_size);
-    if (cache == NULL) {
+    if (list == NULL) {
         return NULL;
     }
 
diff --git a/ext/dom/lexbor/lexbor/html/tree.c b/ext/dom/lexbor/lexbor/html/tree.c
index 0b345dff79879..2625ff0aaeb5c 100644
--- a/ext/dom/lexbor/lexbor/html/tree.c
+++ b/ext/dom/lexbor/lexbor/html/tree.c
@@ -398,22 +398,16 @@ lxb_html_tree_insert_foreign_element(lxb_html_tree_t *tree,
     lxb_html_tree_insertion_position_t ipos;
 
     pos = lxb_html_tree_appropriate_place_inserting_node(tree, NULL, &ipos);
-
-    if (ipos == LXB_HTML_TREE_INSERTION_POSITION_CHILD) {
-        element = lxb_html_tree_create_element_for_token(tree, token, ns, pos);
-    }
-    else {
-        element = lxb_html_tree_create_element_for_token(tree, token, ns,
-                                                         pos->parent);
+    if (pos == NULL) {
+        return NULL;
     }
 
+    element = lxb_html_tree_create_element_for_token(tree, token, ns);
     if (element == NULL) {
         return NULL;
     }
 
-    if (pos != NULL) {
-        lxb_html_tree_insert_node(pos, lxb_dom_interface_node(element), ipos);
-    }
+    lxb_html_tree_insert_node(pos, lxb_dom_interface_node(element), ipos);
 
     status = lxb_html_tree_open_elements_push(tree,
                                               lxb_dom_interface_node(element));
@@ -426,8 +420,7 @@ lxb_html_tree_insert_foreign_element(lxb_html_tree_t *tree,
 
 lxb_html_element_t *
 lxb_html_tree_create_element_for_token(lxb_html_tree_t *tree,
-                                       lxb_html_token_t *token, lxb_ns_id_t ns,
-                                       lxb_dom_node_t *parent)
+                                       lxb_html_token_t *token, lxb_ns_id_t ns)
 {
     lxb_dom_node_t *node = lxb_html_tree_create_node(tree, token->tag_id, ns);
     if (node == NULL) {
@@ -1560,8 +1553,7 @@ lxb_html_tree_adoption_agency_algorithm(lxb_html_tree_t *tree,
             fake_token.base_element = node;
 
             element = lxb_html_tree_create_element_for_token(tree, &fake_token,
-                                                             LXB_NS_HTML,
-                                                             common_ancestor);
+                                                             LXB_NS_HTML);
             if (element == NULL) {
                 *status = LXB_STATUS_ERROR_MEMORY_ALLOCATION;
 
@@ -1615,8 +1607,7 @@ lxb_html_tree_adoption_agency_algorithm(lxb_html_tree_t *tree,
         fake_token.base_element = formatting_element;
 
         element = lxb_html_tree_create_element_for_token(tree, &fake_token,
-                                                         LXB_NS_HTML,
-                                                         furthest_block);
+                                                         LXB_NS_HTML);
         if (element == NULL) {
             *status = LXB_STATUS_ERROR_MEMORY_ALLOCATION;
 
diff --git a/ext/dom/lexbor/lexbor/html/tree.h b/ext/dom/lexbor/lexbor/html/tree.h
index d964f016bc16c..ba55d852d37a4 100644
--- a/ext/dom/lexbor/lexbor/html/tree.h
+++ b/ext/dom/lexbor/lexbor/html/tree.h
@@ -118,8 +118,7 @@ lxb_html_tree_insert_foreign_element(lxb_html_tree_t *tree,
 
 LXB_API lxb_html_element_t *
 lxb_html_tree_create_element_for_token(lxb_html_tree_t *tree,
-                                       lxb_html_token_t *token, lxb_ns_id_t ns,
-                                       lxb_dom_node_t *parent);
+                                       lxb_html_token_t *token, lxb_ns_id_t ns);
 
 LXB_API lxb_status_t
 lxb_html_tree_append_attributes(lxb_html_tree_t *tree,
diff --git a/ext/dom/lexbor/lexbor/html/tree/insertion_mode/before_html.c b/ext/dom/lexbor/lexbor/html/tree/insertion_mode/before_html.c
index b078ac50e3fc7..1e09cda37d500 100644
--- a/ext/dom/lexbor/lexbor/html/tree/insertion_mode/before_html.c
+++ b/ext/dom/lexbor/lexbor/html/tree/insertion_mode/before_html.c
@@ -63,8 +63,7 @@ lxb_html_tree_insertion_mode_before_html_open(lxb_html_tree_t *tree,
             lxb_html_element_t *element;
 
             element = lxb_html_tree_create_element_for_token(tree, token,
-                                            LXB_NS_HTML,
-                                            &tree->document->dom_document.node);
+                                            LXB_NS_HTML);
             if (element == NULL) {
                 tree->status = LXB_STATUS_ERROR_MEMORY_ALLOCATION;
 
diff --git a/ext/dom/lexbor/lexbor/html/tree/insertion_mode/in_head.c b/ext/dom/lexbor/lexbor/html/tree/insertion_mode/in_head.c
index 4d19708544c23..fddf5cea88b04 100644
--- a/ext/dom/lexbor/lexbor/html/tree/insertion_mode/in_head.c
+++ b/ext/dom/lexbor/lexbor/html/tree/insertion_mode/in_head.c
@@ -252,16 +252,7 @@ lxb_html_tree_insertion_mode_in_head_script(lxb_html_tree_t *tree,
         return lxb_html_tree_process_abort(tree);
     }
 
-    if (ipos == LXB_HTML_TREE_INSERTION_POSITION_CHILD) {
-        element = lxb_html_tree_create_element_for_token(tree, token,
-                                                         LXB_NS_HTML, ap_node);
-    }
-    else {
-        element = lxb_html_tree_create_element_for_token(tree, token,
-                                                         LXB_NS_HTML,
-                                                         ap_node->parent);
-    }
-
+    element = lxb_html_tree_create_element_for_token(tree, token, LXB_NS_HTML);
     if (element == NULL) {
         tree->status = LXB_STATUS_ERROR_MEMORY_ALLOCATION;