diff --git a/conversions.rs b/conversions.rs
index 77031fb..9fe7de7 100644
--- a/conversions.rs
+++ b/conversions.rs
@@ -8,7 +8,7 @@
 // except according to those terms.
 
 use wapcaplet::LwcString;
-use wapcaplet::ll::lwc_string;
+use wapcaplet::ll::{lwc_string, rust_lwc_string_ref};
 use core::libc::{c_void, c_char};
 use core::libc::types::common::c99::{uint32_t};
 use core::cast::transmute;
@@ -198,6 +198,7 @@ impl AsLl<css_stylesheet_params> for CssStylesheetParams {
 extern fn resolve(_pw: *c_void, _base: *c_char, rel: *lwc_string, abs: *mut *lwc_string) -> css_error {
     unsafe {
         // TODO
+        rust_lwc_string_ref(rel);
         *abs = rel;
     }
     CSS_OK
diff --git a/netsurfcss.rc b/netsurfcss.rc
index 9784dbc..afa0137 100644
--- a/netsurfcss.rc
+++ b/netsurfcss.rc
@@ -15,6 +15,8 @@ extern mod std;
 extern mod wapcaplet;
 
 use core::libc::{c_void, size_t};
+use core::libc;
+use core::ptr;
 use ll::errors::*;
 use errors::CssError;
 use util::VoidPtrLike;
@@ -49,7 +51,15 @@ pub fn require_ok(code: css_error, what: &str) {
 }
 
 pub extern fn realloc(ptr: *c_void, len: size_t, _pw: *c_void) -> *c_void {
-    unsafe { libc::realloc(ptr, len) }
+    unsafe {
+        if len == 0 {
+            // Needed to prevent a memory leak on Mac.
+            libc::free(ptr);
+            ptr::null()
+        } else {
+            libc::realloc(ptr, len)
+        }
+    }
 }
 
 pub mod types {
@@ -253,7 +263,9 @@ pub mod stylesheet {
 
         fn append_data(&mut self, data: &[u8]) {
             // FIXME: For some reason to_const_ptr isn't accessible
-            let code = unsafe { css_stylesheet_append_data(self.sheet, transmute(vec::raw::to_ptr(data)), data.len() as size_t) };
+            let code = unsafe {
+                css_stylesheet_append_data(self.sheet, transmute(vec::raw::to_ptr(data)), data.len() as size_t)
+            };
             match code {
                 e if e == CSS_NEEDDATA => { /* fine */ },
                 _ => require_ok(code, "appending styleshet data")
@@ -842,9 +854,12 @@ pub mod select {
                 CSS_OK
             }
         }
-        pub extern fn node_is_focus(_pw: *c_void, _node: *c_void, _match_: *bool) -> css_error {
+        pub extern fn node_is_focus(_pw: *c_void, _node: *c_void, match_: *mut bool) -> css_error {
             unimpl_warn("node_is_focus");
-            CSS_OK
+            unsafe {
+                *match_ = false;
+                CSS_OK
+            }
         }
         pub extern fn node_is_enabled(_pw: *c_void, _node: *c_void, _match_: *bool) -> css_error {
             unimpl("node_is_enabled")
@@ -855,8 +870,12 @@ pub mod select {
         pub extern fn node_is_checked(_pw: *c_void, _node: *c_void, _match_: *bool) -> css_error {
             unimpl("node_is_checked")
         }
-        pub extern fn node_is_target(_pw: *c_void, _node: *c_void, _match_: *bool) -> css_error {
-            unimpl("node_is_target")
+        pub extern fn node_is_target(_pw: *c_void, _node: *c_void, match_: *mut bool) -> css_error {
+            unimpl_warn("node_is_target");
+            unsafe {
+                *match_ = false;
+                CSS_OK
+            }
         }
         pub extern fn node_is_lang(_pw: *c_void, _node: *c_void, _lang: *lwc_string, match_: *mut bool) -> css_error {
             unimpl_warn("node_is_lang");