2 files changed, 21 insertions, 2 deletions
diff --git a/components/script/dom/document.rs b/components/script/dom/document.rs
index d33e223bde5..6e5413ebdc8 100644
--- a/components/script/dom/document.rs
+++ b/components/script/dom/document.rs
@@ -189,6 +189,7 @@ pub trait DocumentHelpers<'a> {
     fn window(self) -> Temporary<Window>;
     fn encoding_name(self) -> Ref<'a, DOMString>;
     fn is_html_document(self) -> bool;
+    fn is_fully_active(self) -> bool;
     fn url(self) -> Url;
     fn quirks_mode(self) -> QuirksMode;
     fn set_quirks_mode(self, mode: QuirksMode);
@@ -232,6 +233,21 @@ impl<'a> DocumentHelpers<'a> for JSRef<'a, Document> {
         self.is_html_document
     }
 
+    // https://html.spec.whatwg.org/multipage/browsers.html#fully-active
+    fn is_fully_active(self) -> bool {
+        let window = self.window.root();
+        let window = window.r();
+        let browser_context = window.browser_context();
+        let browser_context = browser_context.as_ref().unwrap();
+        let active_document = browser_context.active_document().root();
+
+        if self.clone() != active_document.r() {
+            return false;
+        }
+        // FIXME: It should also check whether the browser context is top-level or not
+        true
+    }
+
     // http://dom.spec.whatwg.org/#dom-document-url
     fn url(self) -> Url {
         self.url.clone()
diff --git a/components/script/dom/htmlanchorelement.rs b/components/script/dom/htmlanchorelement.rs
index 8d427528aba..0856aae3c80 100644
--- a/components/script/dom/htmlanchorelement.rs
+++ b/components/script/dom/htmlanchorelement.rs
@@ -113,7 +113,11 @@ impl<'a> Activatable for JSRef<'a, HTMLAnchorElement> {
 
     //https://html.spec.whatwg.org/multipage/semantics.html#the-a-element:activation-behaviour
     fn activation_behavior(&self) {
-        //TODO: Step 1. If the node document is not fully active, abort.
+        //Step 1. If the node document is not fully active, abort.
+        let doc = document_from_node(*self).root();
+        if !doc.r().is_fully_active() {
+            return;
+        }
         //TODO: Step 2. Check if browsing context is specified and act accordingly.
         //TODO: Step 3. Handle <img ismap/>.
         //TODO: Step 4. Download the link is `download` attribute is set.
@@ -123,7 +127,6 @@ impl<'a> Activatable for JSRef<'a, HTMLAnchorElement> {
             Some(ref href) => {
                 let value = href.r().Value();
                 debug!("clicked on link to {}", value);
-                let doc = document_from_node(*self).root();
                 doc.r().load_anchor_href(value);
             }
             None => ()