diff --git a/components/atoms/static_atoms.txt b/components/atoms/static_atoms.txt
index 7fbd043dc0fe..151ad41d9149 100644
--- a/components/atoms/static_atoms.txt
+++ b/components/atoms/static_atoms.txt
@@ -65,6 +65,7 @@ range
 readystatechange
 reftest-wait
 reset
+resize
 right
 rtl
 sans-serif
diff --git a/components/script/dom/htmlmediaelement.rs b/components/script/dom/htmlmediaelement.rs
index 60ba96322853..605b6cd8a999 100644
--- a/components/script/dom/htmlmediaelement.rs
+++ b/components/script/dom/htmlmediaelement.rs
@@ -25,6 +25,7 @@ use dom::element::{Element, AttributeMutation};
 use dom::eventtarget::EventTarget;
 use dom::htmlelement::HTMLElement;
 use dom::htmlsourceelement::HTMLSourceElement;
+use dom::htmlvideoelement::HTMLVideoElement;
 use dom::mediaerror::MediaError;
 use dom::node::{document_from_node, window_from_node, Node, NodeDamage, UnbindContext};
 use dom::promise::Promise;
@@ -177,9 +178,9 @@ pub enum NetworkState {
 }
 
 /// <https://html.spec.whatwg.org/multipage/#dom-media-readystate>
-#[derive(Clone, Copy, JSTraceable, MallocSizeOf, PartialEq, PartialOrd)]
+#[derive(Clone, Copy, Debug, JSTraceable, MallocSizeOf, PartialEq, PartialOrd)]
 #[repr(u8)]
-enum ReadyState {
+pub enum ReadyState {
     HaveNothing = HTMLMediaElementConstants::HAVE_NOTHING as u8,
     HaveMetadata = HTMLMediaElementConstants::HAVE_METADATA as u8,
     HaveCurrentData = HTMLMediaElementConstants::HAVE_CURRENT_DATA as u8,
@@ -213,6 +214,10 @@ impl HTMLMediaElement {
         }
     }
 
+    pub fn get_ready_state(&self) -> ReadyState {
+        self.ready_state.get()
+    }
+
     fn media_type_id(&self) -> HTMLMediaElementTypeId {
         match self.upcast::<Node>().type_id() {
             NodeTypeId::Element(ElementTypeId::HTMLElement(
@@ -952,8 +957,35 @@ impl HTMLMediaElement {
                 if !self.have_metadata.get() {
                     // https://html.spec.whatwg.org/multipage/#media-data-processing-steps-list
                     // => "Once enough of the media data has been fetched to determine the duration..."
+                    // Step 1.
+                    // servo-media owns the media timeline.
+
+                    // Step 2.
+                    // XXX(ferjm) Update the timeline offset.
+
+                    // Step 3.
+                    // XXX(ferjm) Set the current and official playback positions
+                    //            to the earliest possible position.
+
+                    // Step 4.
+                    // XXX(ferjm) Update duration.
+
+                    // Step 5.
+                    if self.is::<HTMLVideoElement>() {
+                        assert_ne!(self.ready_state.get(), ReadyState::HaveNothing);
+                        let video_elem = self.downcast::<HTMLVideoElement>().unwrap();
+                        video_elem.set_video_width(metadata.width);
+                        video_elem.set_video_height(metadata.height);
+                        let window = window_from_node(self);
+                        window.dom_manipulation_task_source().queue_simple_event(
+                            self.upcast(),
+                            atom!("resize"),
+                            &window,
+                        );
+                    }
+
                     if let Some(_dur) = metadata.duration {
-                        // Setp 6.
+                        // Step 6.
                         self.change_ready_state(ReadyState::HaveMetadata);
                         self.have_metadata.set(true);
                     }
diff --git a/components/script/dom/htmlvideoelement.rs b/components/script/dom/htmlvideoelement.rs
index 8561aa051e1c..5ce8d941b61d 100644
--- a/components/script/dom/htmlvideoelement.rs
+++ b/components/script/dom/htmlvideoelement.rs
@@ -3,16 +3,20 @@
  * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
 
 use dom::bindings::codegen::Bindings::HTMLVideoElementBinding;
+use dom::bindings::codegen::Bindings::HTMLVideoElementBinding::HTMLVideoElementMethods;
 use dom::bindings::root::DomRoot;
 use dom::document::Document;
-use dom::htmlmediaelement::HTMLMediaElement;
+use dom::htmlmediaelement::{HTMLMediaElement, ReadyState};
 use dom::node::Node;
 use dom_struct::dom_struct;
 use html5ever::{LocalName, Prefix};
+use std::cell::Cell;
 
 #[dom_struct]
 pub struct HTMLVideoElement {
     htmlmediaelement: HTMLMediaElement,
+    video_width: Cell<u32>,
+    video_height: Cell<u32>,
 }
 
 impl HTMLVideoElement {
@@ -23,6 +27,8 @@ impl HTMLVideoElement {
     ) -> HTMLVideoElement {
         HTMLVideoElement {
             htmlmediaelement: HTMLMediaElement::new_inherited(local_name, prefix, document),
+            video_width: Cell::new(0),
+            video_height: Cell::new(0),
         }
     }
 
@@ -40,4 +46,28 @@ impl HTMLVideoElement {
             HTMLVideoElementBinding::Wrap,
         )
     }
+
+    pub fn set_video_width(&self, width: u32) {
+        self.video_width.set(width);
+    }
+
+    pub fn set_video_height(&self, height: u32) {
+        self.video_height.set(height);
+    }
+}
+
+impl HTMLVideoElementMethods for HTMLVideoElement {
+    fn VideoWidth(&self) -> u32 {
+        if self.htmlmediaelement.get_ready_state() == ReadyState::HaveNothing {
+            return 0;
+        }
+        self.video_width.get()
+    }
+
+    fn VideoHeight(&self) -> u32 {
+        if self.htmlmediaelement.get_ready_state() == ReadyState::HaveNothing {
+            return 0;
+        }
+        self.video_height.get()
+    }
 }
diff --git a/components/script/dom/webidls/HTMLVideoElement.webidl b/components/script/dom/webidls/HTMLVideoElement.webidl
index bfd1be006eaf..a3a34e7c47e9 100644
--- a/components/script/dom/webidls/HTMLVideoElement.webidl
+++ b/components/script/dom/webidls/HTMLVideoElement.webidl
@@ -9,8 +9,8 @@ interface HTMLVideoElement : HTMLMediaElement {
   //          attribute unsigned long width;
   // [CEReactions]
   //          attribute unsigned long height;
-  // readonly attribute unsigned long videoWidth;
-  // readonly attribute unsigned long videoHeight;
+  readonly attribute unsigned long videoWidth;
+  readonly attribute unsigned long videoHeight;
   // [CEReactions]
   //          attribute DOMString poster;
 };