From 62844c6133aaac3135e263e6da9a818ce7562bf9 Mon Sep 17 00:00:00 2001
From: Brian Birtles <birtles@gmail.com>
Date: Wed, 18 Aug 2010 19:20:24 +0900
Subject: [PATCH] Bug 485157: SMIL event timing, part 5 make default event base
 the animation target, r=dholbert, sr=roc, a=roc

---
 content/smil/nsSMILTimeValueSpec.cpp          | 26 +++++++---
 content/smil/nsSMILTimeValueSpec.h            |  6 +++
 content/smil/nsSMILTimedElement.cpp           | 14 ++++++
 content/smil/nsSMILTimedElement.h             | 17 +++++++
 .../svg/content/src/nsSVGAnimationElement.cpp | 47 +++++++++++++------
 .../svg/content/src/nsSVGAnimationElement.h   |  7 ++-
 .../svg/smil/event/event-target-default-1.svg | 15 ++++++
 .../svg/smil/event/event-target-default-2.svg | 14 ++++++
 .../smil/event/event-target-id-change-1.svg   | 15 ++++++
 .../smil/event/event-target-id-change-2.svg   | 16 +++++++
 .../smil/event/event-target-id-change-3.svg   | 16 +++++++
 .../smil/event/event-target-non-svg-1.xhtml   | 37 +++++++++++++++
 .../svg/smil/event/event-target-surgery-1.svg | 17 +++++++
 .../svg/smil/event/event-target-surgery-2.svg | 15 ++++++
 .../svg/smil/event/event-target-surgery-3.svg | 32 +++++++++++++
 .../event/event-target-xlink-change-1.svg     | 17 +++++++
 .../event/event-target-xlink-change-2.svg     | 18 +++++++
 .../event/event-target-xlink-change-3.svg     | 18 +++++++
 .../event/event-target-xlink-change-4.svg     | 18 +++++++
 .../svg/smil/event/green-box-ref.xhtml        |  8 ++++
 layout/reftests/svg/smil/event/reftest.list   | 13 +++++
 21 files changed, 362 insertions(+), 24 deletions(-)
 create mode 100644 layout/reftests/svg/smil/event/event-target-default-1.svg
 create mode 100644 layout/reftests/svg/smil/event/event-target-default-2.svg
 create mode 100644 layout/reftests/svg/smil/event/event-target-id-change-1.svg
 create mode 100644 layout/reftests/svg/smil/event/event-target-id-change-2.svg
 create mode 100644 layout/reftests/svg/smil/event/event-target-id-change-3.svg
 create mode 100644 layout/reftests/svg/smil/event/event-target-non-svg-1.xhtml
 create mode 100644 layout/reftests/svg/smil/event/event-target-surgery-1.svg
 create mode 100644 layout/reftests/svg/smil/event/event-target-surgery-2.svg
 create mode 100644 layout/reftests/svg/smil/event/event-target-surgery-3.svg
 create mode 100644 layout/reftests/svg/smil/event/event-target-xlink-change-1.svg
 create mode 100644 layout/reftests/svg/smil/event/event-target-xlink-change-2.svg
 create mode 100644 layout/reftests/svg/smil/event/event-target-xlink-change-3.svg
 create mode 100644 layout/reftests/svg/smil/event/event-target-xlink-change-4.svg
 create mode 100644 layout/reftests/svg/smil/event/green-box-ref.xhtml

diff --git a/content/smil/nsSMILTimeValueSpec.cpp b/content/smil/nsSMILTimeValueSpec.cpp
index 0f23a26f398..421d52df99b 100644
--- a/content/smil/nsSMILTimeValueSpec.cpp
+++ b/content/smil/nsSMILTimeValueSpec.cpp
@@ -126,7 +126,7 @@ void
 nsSMILTimeValueSpec::ResolveReferences(nsIContent* aContextNode)
 {
   if (mParams.mType != nsSMILTimeValueSpecParams::SYNCBASE &&
-      mParams.mType != nsSMILTimeValueSpecParams::EVENT)
+      !IsEventBased())
     return;
 
   NS_ABORT_IF_FALSE(aContextNode,
@@ -142,11 +142,15 @@ nsSMILTimeValueSpec::ResolveReferences(nsIContent* aContextNode)
   // element.
   nsRefPtr<Element> oldReferencedElement = mReferencedElement.get();
 
-  // XXX Support default event targets
-  NS_ABORT_IF_FALSE(mParams.mDependentElemID, "NULL dependent element id");
-  nsString idStr;
-  mParams.mDependentElemID->ToString(idStr);
-  mReferencedElement.ResetWithID(aContextNode, idStr);
+  if (mParams.mDependentElemID) {
+    mReferencedElement.ResetWithID(aContextNode,
+        nsDependentAtomString(mParams.mDependentElemID));
+  } else if (IsEventBased()) {
+    Element* target = mOwner->GetTargetElement();
+    mReferencedElement.ResetWithElement(target);
+  } else {
+    NS_ABORT_IF_FALSE(PR_FALSE, "Syncbase element without ID");
+  }
   UpdateReferencedElement(oldReferencedElement, mReferencedElement.get());
 }
 
@@ -179,6 +183,15 @@ nsSMILTimeValueSpec::HandleNewInterval(nsSMILInterval& aInterval,
   mOwner->AddInstanceTime(newInstance, mIsBegin);
 }
 
+void
+nsSMILTimeValueSpec::HandleTargetElementChange(Element* aNewTarget)
+{
+  if (!IsEventBased() || mParams.mDependentElemID)
+    return;
+
+  mReferencedElement.ResetWithElement(aNewTarget);
+}
+
 void
 nsSMILTimeValueSpec::HandleChangedInstanceTime(
     const nsSMILInstanceTime& aBaseTime,
@@ -292,7 +305,6 @@ nsSMILTimeValueSpec::RegisterEventListener(Element* aTarget)
   NS_ABORT_IF_FALSE(mParams.mEventSymbol,
     "Attempting to register event-listener but there is no event name");
 
-  // XXX Support default event targets
   if (!aTarget)
     return;
 
diff --git a/content/smil/nsSMILTimeValueSpec.h b/content/smil/nsSMILTimeValueSpec.h
index a6860c2cb79..4f1ec968b17 100644
--- a/content/smil/nsSMILTimeValueSpec.h
+++ b/content/smil/nsSMILTimeValueSpec.h
@@ -75,6 +75,7 @@ public:
 
   void     HandleNewInterval(nsSMILInterval& aInterval,
                              const nsSMILTimeContainer* aSrcContainer);
+  void     HandleTargetElementChange(Element* aNewTarget);
 
   // For created nsSMILInstanceTime objects
   PRBool   DependsOnBegin() const;
@@ -112,6 +113,11 @@ protected:
   {
   public:
     TimeReferenceElement(nsSMILTimeValueSpec* aOwner) : mSpec(aOwner) { }
+    void ResetWithElement(Element* aTo) {
+      nsRefPtr<Element> from = get();
+      Unlink();
+      ElementChanged(from, aTo);
+    }
 
   protected:
     virtual void ElementChanged(Element* aFrom, Element* aTo)
diff --git a/content/smil/nsSMILTimedElement.cpp b/content/smil/nsSMILTimedElement.cpp
index 08e7c2e7e53..59f6c4a3f96 100644
--- a/content/smil/nsSMILTimedElement.cpp
+++ b/content/smil/nsSMILTimedElement.cpp
@@ -1121,6 +1121,20 @@ nsSMILTimedElement::BindToTree(nsIContent* aContextNode)
   RegisterMilestone();
 }
 
+void
+nsSMILTimedElement::HandleTargetElementChange(Element* aNewTarget)
+{
+  PRUint32 count = mBeginSpecs.Length();
+  for (PRUint32 i = 0; i < count; ++i) {
+    mBeginSpecs[i]->HandleTargetElementChange(aNewTarget);
+  }
+
+  count = mEndSpecs.Length();
+  for (PRUint32 j = 0; j < count; ++j) {
+    mEndSpecs[j]->HandleTargetElementChange(aNewTarget);
+  }
+}
+
 void
 nsSMILTimedElement::Traverse(nsCycleCollectionTraversalCallback* aCallback)
 {
diff --git a/content/smil/nsSMILTimedElement.h b/content/smil/nsSMILTimedElement.h
index 4c4c16be1d9..eebc8ab7375 100644
--- a/content/smil/nsSMILTimedElement.h
+++ b/content/smil/nsSMILTimedElement.h
@@ -79,6 +79,17 @@ public:
    */
   nsSMILTimeContainer* GetTimeContainer();
 
+  /*
+   * Returns the element targeted by the animation element. Needed for
+   * registering event listeners against the appropriate element.
+   */
+  mozilla::dom::Element* GetTargetElement()
+  {
+    return mAnimationElement ?
+        mAnimationElement->GetTargetElementContent() :
+        nsnull;
+  }
+
   /**
    * Methods for supporting the nsIDOMElementTimeControl interface.
    */
@@ -319,6 +330,12 @@ public:
    */
   void BindToTree(nsIContent* aContextNode);
 
+  /**
+   * Called when the target of the animation has changed so that event
+   * registrations can be updated.
+   */
+  void HandleTargetElementChange(mozilla::dom::Element* aNewTarget);
+
   /**
    * Called when the timed element has been removed from a document so that
    * references to other elements can be broken.
diff --git a/content/svg/content/src/nsSVGAnimationElement.cpp b/content/svg/content/src/nsSVGAnimationElement.cpp
index e7224d02851..95f18aad2de 100644
--- a/content/svg/content/src/nsSVGAnimationElement.cpp
+++ b/content/svg/content/src/nsSVGAnimationElement.cpp
@@ -372,17 +372,30 @@ nsSVGAnimationElement::ParseAttribute(PRInt32 aNamespaceID,
     }
   }
 
-  PRBool returnVal =
-    nsSVGAnimationElementBase::ParseAttribute(aNamespaceID, aAttribute,
-                                              aValue, aResult);
-  if (aNamespaceID == kNameSpaceID_XLink &&
-      aAttribute == nsGkAtoms::href &&
-      IsInDoc()) {
-    // NOTE: If we fail the IsInDoc call, it's ok -- we'll update the target
-    // on next BindToTree call.
-    UpdateHrefTarget(this, aValue);
-  }
-  return returnVal;
+  return nsSVGAnimationElementBase::ParseAttribute(aNamespaceID, aAttribute,
+                                                   aValue, aResult);
+}
+
+nsresult
+nsSVGAnimationElement::AfterSetAttr(PRInt32 aNamespaceID, nsIAtom* aName,
+                                    const nsAString* aValue, PRBool aNotify)
+{
+  nsresult rv =
+    nsSVGAnimationElementBase::AfterSetAttr(aNamespaceID, aName, aValue,
+                                            aNotify);
+
+  if (aNamespaceID != kNameSpaceID_XLink || aName != nsGkAtoms::href)
+    return rv;
+
+  if (!aValue) {
+    mHrefTarget.Unlink();
+    AnimationTargetChanged();
+  } else if (IsInDoc()) {
+    UpdateHrefTarget(this, *aValue);
+  } // else: we're not yet in a document -- we'll update the target on
+    // next BindToTree call.
+
+  return rv;
 }
 
 nsresult
@@ -398,10 +411,6 @@ nsSVGAnimationElement::UnsetAttr(PRInt32 aNamespaceID,
         mTimedElement.UnsetAttr(aAttribute)) {
       AnimationNeedsResample();
     }
-  } else if (aNamespaceID == kNameSpaceID_XLink) {
-    if (aAttribute == nsGkAtoms::href) {
-      mHrefTarget.Unlink();
-    }
   }
 
   return NS_OK;
@@ -491,4 +500,12 @@ nsSVGAnimationElement::UpdateHrefTarget(nsIContent* aNodeForContext,
   nsContentUtils::NewURIWithDocumentCharset(getter_AddRefs(targetURI),
                                             aHrefStr, GetOwnerDoc(), baseURI);
   mHrefTarget.Reset(aNodeForContext, targetURI);
+  AnimationTargetChanged();
+}
+
+void
+nsSVGAnimationElement::AnimationTargetChanged()
+{
+  mTimedElement.HandleTargetElementChange(GetTargetElementContent());
+  AnimationNeedsResample();
 }
diff --git a/content/svg/content/src/nsSVGAnimationElement.h b/content/svg/content/src/nsSVGAnimationElement.h
index 5b3688f66e0..702252e6a00 100644
--- a/content/svg/content/src/nsSVGAnimationElement.h
+++ b/content/svg/content/src/nsSVGAnimationElement.h
@@ -84,6 +84,8 @@ public:
                                 nsIAtom* aAttribute,
                                 const nsAString& aValue,
                                 nsAttrValue& aResult);
+  virtual nsresult AfterSetAttr(PRInt32 aNamespaceID, nsIAtom* aName,
+                                const nsAString* aValue, PRBool aNotify);
 
   // nsISMILAnimationElement interface
   virtual const Element& AsElement() const;
@@ -103,6 +105,7 @@ protected:
 
   void UpdateHrefTarget(nsIContent* aNodeForContext,
                         const nsAString& aHrefStr);
+  void AnimationTargetChanged();
 
   class TargetReference : public nsReferencedElement {
   public:
@@ -111,10 +114,10 @@ protected:
   protected:
     // We need to be notified when target changes, in order to request a
     // sample (which will clear animation effects from old target and apply
-    // them to the new target).
+    // them to the new target) and update any event registrations.
     virtual void ElementChanged(Element* aFrom, Element* aTo) {
       nsReferencedElement::ElementChanged(aFrom, aTo);
-      mAnimationElement->AnimationNeedsResample();
+      mAnimationElement->AnimationTargetChanged();
     }
 
     // We need to override IsPersistent to get persistent tracking (beyond the
diff --git a/layout/reftests/svg/smil/event/event-target-default-1.svg b/layout/reftests/svg/smil/event/event-target-default-1.svg
new file mode 100644
index 00000000000..2fedc403699
--- /dev/null
+++ b/layout/reftests/svg/smil/event/event-target-default-1.svg
@@ -0,0 +1,15 @@
+<!-- Test default parent target -->
+<svg xmlns="http://www.w3.org/2000/svg"
+     xmlns:xlink="http://www.w3.org/1999/xlink"
+     class="reftest-wait"
+     onload="
+        document.documentElement.pauseAnimations();
+        document.documentElement.setCurrentTime(0);
+        click('rect');
+        delayedSnapshot(2)">
+  <script xlink:href="event-util.js" type="text/javascript"/>
+  <rect width="100" height="100" fill="red" id="rect">
+    <set attributeName="fill" attributeType="CSS" to="green"
+      begin="click" dur="4s"/>
+  </rect>
+</svg>
diff --git a/layout/reftests/svg/smil/event/event-target-default-2.svg b/layout/reftests/svg/smil/event/event-target-default-2.svg
new file mode 100644
index 00000000000..dec770e7e90
--- /dev/null
+++ b/layout/reftests/svg/smil/event/event-target-default-2.svg
@@ -0,0 +1,14 @@
+<!-- Test default target with xlink:href -->
+<svg xmlns="http://www.w3.org/2000/svg"
+     xmlns:xlink="http://www.w3.org/1999/xlink"
+     class="reftest-wait"
+     onload="
+        document.documentElement.pauseAnimations();
+        document.documentElement.setCurrentTime(0);
+        click('rect');
+        delayedSnapshot(2)">
+  <script xlink:href="event-util.js" type="text/javascript"/>
+  <rect width="100" height="100" fill="red" id="rect"/>
+  <set xlink:href="#rect" attributeName="fill" attributeType="CSS" to="green"
+    begin="click" dur="4s"/>
+</svg>
diff --git a/layout/reftests/svg/smil/event/event-target-id-change-1.svg b/layout/reftests/svg/smil/event/event-target-id-change-1.svg
new file mode 100644
index 00000000000..836ebc9d468
--- /dev/null
+++ b/layout/reftests/svg/smil/event/event-target-id-change-1.svg
@@ -0,0 +1,15 @@
+<!-- Test that changes to ID assignments are reflected in event registration -->
+<svg xmlns="http://www.w3.org/2000/svg"
+     xmlns:xlink="http://www.w3.org/1999/xlink"
+     class="reftest-wait"
+     onload="
+        document.documentElement.pauseAnimations();
+        document.documentElement.setCurrentTime(0);
+        document.getElementById('square').setAttribute('id', 'rect');
+        click('rect');
+        delayedSnapshot(2)">
+  <script xlink:href="event-util.js" type="text/javascript"/>
+  <rect width="100" height="100" fill="red" id="square"/>
+  <set xlink:href="#rect" attributeName="fill" attributeType="CSS" to="green"
+    begin="click" dur="4s"/>
+</svg>
diff --git a/layout/reftests/svg/smil/event/event-target-id-change-2.svg b/layout/reftests/svg/smil/event/event-target-id-change-2.svg
new file mode 100644
index 00000000000..2046eb9c827
--- /dev/null
+++ b/layout/reftests/svg/smil/event/event-target-id-change-2.svg
@@ -0,0 +1,16 @@
+<!-- Test that changes to ID assignments are reflected in event registration.
+     Test for when the animation target becomes invalid. -->
+<svg xmlns="http://www.w3.org/2000/svg"
+     xmlns:xlink="http://www.w3.org/1999/xlink"
+     class="reftest-wait"
+     onload="
+        document.documentElement.pauseAnimations();
+        document.documentElement.setCurrentTime(0);
+        document.getElementById('rect').setAttribute('id', 'square');
+        click('square');
+        delayedSnapshot(2)">
+  <script xlink:href="event-util.js" type="text/javascript"/>
+  <rect width="100" height="100" fill="green" id="rect"/>
+  <set xlink:href="#rect" attributeName="fill" attributeType="CSS" to="red"
+    begin="click" dur="4s"/>
+</svg>
diff --git a/layout/reftests/svg/smil/event/event-target-id-change-3.svg b/layout/reftests/svg/smil/event/event-target-id-change-3.svg
new file mode 100644
index 00000000000..9e73efb26b7
--- /dev/null
+++ b/layout/reftests/svg/smil/event/event-target-id-change-3.svg
@@ -0,0 +1,16 @@
+<!-- Test that changes to ID assignments are reflected in event registration.
+     Test with end specifications. -->
+<svg xmlns="http://www.w3.org/2000/svg"
+     xmlns:xlink="http://www.w3.org/1999/xlink"
+     class="reftest-wait"
+     onload="
+        document.documentElement.pauseAnimations();
+        document.documentElement.setCurrentTime(1);
+        document.getElementById('square').setAttribute('id', 'rect');
+        click('rect');
+        delayedSnapshot(2)">
+  <script xlink:href="event-util.js" type="text/javascript"/>
+  <rect width="100" height="100" fill="green" id="square"/>
+  <set xlink:href="#rect" attributeName="fill" attributeType="CSS" to="red"
+    begin="0s" end="click" dur="4s"/>
+</svg>
diff --git a/layout/reftests/svg/smil/event/event-target-non-svg-1.xhtml b/layout/reftests/svg/smil/event/event-target-non-svg-1.xhtml
new file mode 100644
index 00000000000..6ad1874e2ad
--- /dev/null
+++ b/layout/reftests/svg/smil/event/event-target-non-svg-1.xhtml
@@ -0,0 +1,37 @@
+<?xml version="1.0" encoding="UTF-8" ?>
+<html xmlns="http://www.w3.org/1999/xhtml" class="reftest-wait">
+<!--
+  Test for non-SVG event bases. This isn't strictly required but we at very
+  least we want to make sure our behaviour is defined.
+ -->
+<head>
+<script src="event-util.js" type="text/javascript"></script>
+<script>
+function snapshot() {
+  var svg = document.getElementById("svg");
+  svg.pauseAnimations();
+  svg.setCurrentTime(0);
+  click('a');
+  var a = document.getElementById('a');
+  a.style.display = 'none';
+  window.setTimeout(doSnapshot, 10);
+}
+
+function doSnapshot() {
+  var svg = document.getElementById("svg");
+  svg.pauseAnimations();
+  svg.setCurrentTime(2);
+  document.documentElement.removeAttribute("class");
+}
+</script>
+</head>
+<body onload="snapshot()">
+<a href="#" id="a">Play!</a>
+<svg xmlns="http://www.w3.org/2000/svg" width="120px" height="120px" id="svg">
+  <rect width="100" height="100" fill="red">
+    <set attributeName="fill" attributeType="CSS" to="green"
+      begin="a.click" dur="4s"/>
+  </rect>
+</svg>
+</body>
+</html>
diff --git a/layout/reftests/svg/smil/event/event-target-surgery-1.svg b/layout/reftests/svg/smil/event/event-target-surgery-1.svg
new file mode 100644
index 00000000000..9959a14df2f
--- /dev/null
+++ b/layout/reftests/svg/smil/event/event-target-surgery-1.svg
@@ -0,0 +1,17 @@
+<!-- Test that animations are unregistered when removed -->
+<svg xmlns="http://www.w3.org/2000/svg"
+     xmlns:xlink="http://www.w3.org/1999/xlink"
+     class="reftest-wait"
+     onload="
+        document.documentElement.pauseAnimations();
+        document.documentElement.setCurrentTime(0);
+        document.getElementById('rect').removeChild(
+          document.getElementById('anim'));
+        click('rect');
+        delayedSnapshot(2)">
+  <script xlink:href="event-util.js" type="text/javascript"/>
+  <rect width="100" height="100" fill="green" id="rect">
+    <set attributeName="fill" attributeType="CSS"
+      to="red" begin="click" dur="4s" id="anim"/>
+  </rect>
+</svg>
diff --git a/layout/reftests/svg/smil/event/event-target-surgery-2.svg b/layout/reftests/svg/smil/event/event-target-surgery-2.svg
new file mode 100644
index 00000000000..b9a778b38db
--- /dev/null
+++ b/layout/reftests/svg/smil/event/event-target-surgery-2.svg
@@ -0,0 +1,15 @@
+<!-- Test that animations are unregistered when removed -->
+<svg xmlns="http://www.w3.org/2000/svg"
+     xmlns:xlink="http://www.w3.org/1999/xlink"
+     class="reftest-wait"
+     onload="
+        document.documentElement.pauseAnimations();
+        document.documentElement.setCurrentTime(0);
+        document.documentElement.removeChild(document.getElementById('anim'));
+        click('rect');
+        delayedSnapshot(2)">
+  <script xlink:href="event-util.js" type="text/javascript"/>
+  <rect width="100" height="100" fill="green" id="rect"/>
+  <set xlink:href="#rect" attributeName="fill" attributeType="CSS"
+    to="red" begin="click" dur="4s" id="anim"/>
+</svg>
diff --git a/layout/reftests/svg/smil/event/event-target-surgery-3.svg b/layout/reftests/svg/smil/event/event-target-surgery-3.svg
new file mode 100644
index 00000000000..cf68fc691b3
--- /dev/null
+++ b/layout/reftests/svg/smil/event/event-target-surgery-3.svg
@@ -0,0 +1,32 @@
+<!-- Test that event registration is updated when reparenting -->
+<svg xmlns="http://www.w3.org/2000/svg"
+     xmlns:xlink="http://www.w3.org/1999/xlink"
+     class="reftest-wait"
+     onload="reparent()">
+  <script xlink:href="event-util.js" type="text/javascript"/>
+  <script type="text/javascript">
+    function reparent()
+    {
+      var svg = document.documentElement;
+      svg.pauseAnimations();
+      svg.setCurrentTime(0);
+      var circle    = document.getElementById('circle');
+      var rect      = document.getElementById('rect');
+      var animmove  = document.getElementById('anim-move');
+      var animcolor = document.getElementById('anim-color');
+      circle.appendChild(animmove);
+      rect.appendChild(animcolor);
+      click('rect');
+      delayedSnapshot(2);
+    }
+  </script>
+  <circle id="circle" r="10">
+    <set attributeName="fill" attributeType="CSS"
+      to="green" begin="click" dur="4s" id="anim-color"/>
+  </circle>
+  <rect width="100" height="100" fill="red" id="rect">
+    <animateTransform attributeName="transform" type="translate"
+      values="100; 100" calcMode="discrete"
+      begin="click" dur="4s" id="anim-move"/>
+  </rect>
+</svg>
diff --git a/layout/reftests/svg/smil/event/event-target-xlink-change-1.svg b/layout/reftests/svg/smil/event/event-target-xlink-change-1.svg
new file mode 100644
index 00000000000..f742e9276e7
--- /dev/null
+++ b/layout/reftests/svg/smil/event/event-target-xlink-change-1.svg
@@ -0,0 +1,17 @@
+<!-- Test that changes to animation targets update event registration. -->
+<svg xmlns="http://www.w3.org/2000/svg"
+     xmlns:xlink="http://www.w3.org/1999/xlink"
+     class="reftest-wait"
+     onload="
+        document.documentElement.pauseAnimations();
+        document.documentElement.setCurrentTime(0);
+        document.getElementById('anim').setAttributeNS(
+          'http://www.w3.org/1999/xlink', 'href', '#rect');
+        click('rect');
+        delayedSnapshot(2)">
+  <script xlink:href="event-util.js" type="text/javascript"/>
+  <circle id="circle" r="10"/>
+  <rect width="100" height="100" fill="red" id="rect"/>
+  <set xlink:href="#circle" attributeName="fill" attributeType="CSS" to="green"
+    begin="click" dur="4s" id="anim"/>
+</svg>
diff --git a/layout/reftests/svg/smil/event/event-target-xlink-change-2.svg b/layout/reftests/svg/smil/event/event-target-xlink-change-2.svg
new file mode 100644
index 00000000000..0b8283f8bda
--- /dev/null
+++ b/layout/reftests/svg/smil/event/event-target-xlink-change-2.svg
@@ -0,0 +1,18 @@
+<!-- Test that changes to animation targets update event registration. -->
+<svg xmlns="http://www.w3.org/2000/svg"
+     xmlns:xlink="http://www.w3.org/1999/xlink"
+     class="reftest-wait"
+     onload="
+        document.documentElement.pauseAnimations();
+        document.documentElement.setCurrentTime(0);
+        document.getElementById('anim').setAttributeNS(
+          'http://www.w3.org/1999/xlink', 'href', '#circle');
+        click('rect');
+        delayedSnapshot(2)">
+  <script xlink:href="event-util.js" type="text/javascript"/>
+  <circle id="circle" r="10"/>
+  <rect width="100" height="100" fill="green" id="rect">
+    <set attributeName="fill" attributeType="CSS"
+      to="red" begin="click" dur="4s" id="anim"/>
+  </rect>
+</svg>
diff --git a/layout/reftests/svg/smil/event/event-target-xlink-change-3.svg b/layout/reftests/svg/smil/event/event-target-xlink-change-3.svg
new file mode 100644
index 00000000000..d88f1aa77aa
--- /dev/null
+++ b/layout/reftests/svg/smil/event/event-target-xlink-change-3.svg
@@ -0,0 +1,18 @@
+<!-- Test that changes to animation targets update event registration. -->
+<svg xmlns="http://www.w3.org/2000/svg"
+     xmlns:xlink="http://www.w3.org/1999/xlink"
+     class="reftest-wait"
+     onload="
+        document.documentElement.pauseAnimations();
+        document.documentElement.setCurrentTime(0);
+        document.getElementById('anim').removeAttributeNS(
+          'http://www.w3.org/1999/xlink', 'href');
+        click('rect');
+        delayedSnapshot(2)">
+  <script xlink:href="event-util.js" type="text/javascript"/>
+  <circle id="circle" r="10"/>
+  <rect width="100" height="100" fill="red" id="rect">
+    <set xlink:href="#circle" attributeName="fill" attributeType="CSS"
+      to="green" begin="click" dur="4s" id="anim"/>
+  </rect>
+</svg>
diff --git a/layout/reftests/svg/smil/event/event-target-xlink-change-4.svg b/layout/reftests/svg/smil/event/event-target-xlink-change-4.svg
new file mode 100644
index 00000000000..14e6a465531
--- /dev/null
+++ b/layout/reftests/svg/smil/event/event-target-xlink-change-4.svg
@@ -0,0 +1,18 @@
+<!-- Test that changes to animation targets update event registration. -->
+<svg xmlns="http://www.w3.org/2000/svg"
+     xmlns:xlink="http://www.w3.org/1999/xlink"
+     class="reftest-wait"
+     onload="
+        document.documentElement.pauseAnimations();
+        document.documentElement.setCurrentTime(0);
+        document.getElementById('anim').removeAttributeNS(
+          'http://www.w3.org/1999/xlink', 'href');
+        click('circle');
+        delayedSnapshot(2)">
+  <script xlink:href="event-util.js" type="text/javascript"/>
+  <circle id="circle" r="10"/>
+  <rect width="100" height="100" fill="green" id="rect">
+    <set xlink:href="#circle" attributeName="fill" attributeType="CSS"
+      to="red" begin="click" dur="4s" id="anim"/>
+  </rect>
+</svg>
diff --git a/layout/reftests/svg/smil/event/green-box-ref.xhtml b/layout/reftests/svg/smil/event/green-box-ref.xhtml
new file mode 100644
index 00000000000..ce0bc78f12d
--- /dev/null
+++ b/layout/reftests/svg/smil/event/green-box-ref.xhtml
@@ -0,0 +1,8 @@
+<?xml version="1.0" encoding="UTF-8" ?>
+<html xmlns="http://www.w3.org/1999/xhtml">
+<body>
+<svg xmlns="http://www.w3.org/2000/svg" width="120px" height="120px">
+  <rect width="100" height="100" fill="green"/>
+</svg>
+</body>
+</html>
diff --git a/layout/reftests/svg/smil/event/reftest.list b/layout/reftests/svg/smil/event/reftest.list
index 921999a929d..4e5aae0a4f9 100644
--- a/layout/reftests/svg/smil/event/reftest.list
+++ b/layout/reftests/svg/smil/event/reftest.list
@@ -14,3 +14,16 @@
 == event-end-open-1.svg green-box-ref.svg
 == event-preventDefault-1.svg green-box-ref.svg
 == event-seek-1.svg green-box-ref.svg
+== event-target-default-1.svg green-box-ref.svg
+== event-target-default-2.svg green-box-ref.svg
+== event-target-id-change-1.svg green-box-ref.svg
+== event-target-id-change-2.svg green-box-ref.svg
+== event-target-id-change-3.svg green-box-ref.svg
+== event-target-xlink-change-1.svg green-box-ref.svg
+== event-target-xlink-change-2.svg green-box-ref.svg
+== event-target-xlink-change-3.svg green-box-ref.svg
+== event-target-xlink-change-4.svg green-box-ref.svg
+== event-target-surgery-1.svg green-box-ref.svg
+== event-target-surgery-2.svg green-box-ref.svg
+== event-target-surgery-3.svg green-box-ref.svg
+== event-target-non-svg-1.xhtml green-box-ref.xhtml