Initial pass at appending style

components/script/dom/element.rs

@@ -5,6 +5,7 @@
 //! Element nodes.
 
 use app_units::Au;
+use core::ops::Deref;
 use cssparser::Color;
 use devtools_traits::AttrInfo;
 use dom::activation::Activatable;
@@ -670,6 +671,30 @@ impl Element {
     pub fn update_inline_style(&self,
                                property_decl: PropertyDeclaration,
                                style_priority: StylePriority) {
+
+        let style_to_append = format!("{}: {}; ", property_decl.name(), property_decl.value());
+        if let Some(style_attr) = self.attrs.borrow().iter().find(|a| a.name() == &atom!("style")) {
+            let mut style_string = DOMString::from(style_attr.deref().value().deref().deref());
+            style_string.push_str(&style_to_append);
+
+            let new_value = AttrValue::String(style_string);
+            style_attr.set_value(new_value, self);
+        }
+        else {
+            let style_string = DOMString::from_string(style_to_append);
+            let window = window_from_node(self);
+
+            let attr = Attr::new(&window,
+                                 atom!("style"),
+                                 AttrValue::String(style_string),
+                                 atom!("style"),
+                                 ns!(),
+                                 Some(atom!("style")),
+                                 Some(self));
+
+            self.attrs.borrow_mut().push(JS::from_rooted(&attr));
+        }
+
         let mut inline_declarations = self.style_attribute().borrow_mut();
         if let &mut Some(ref mut declarations) = &mut *inline_declarations {
             let existing_declarations = if style_priority == StylePriority::Important {