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diff --git a/dom/smil/test/test_smilConditionalProcessing.html b/dom/smil/test/test_smilConditionalProcessing.html
new file mode 100644
index 0000000000..302c445b6e
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+++ b/dom/smil/test/test_smilConditionalProcessing.html
@@ -0,0 +1,93 @@
+<!doctype html>
+<html>
+<head>
+  <meta charset="utf-8">
+  <title>Test conditional processing tests applied to animations</title>
+  <script src="/tests/SimpleTest/SimpleTest.js"></script>
+  <link rel="stylesheet" type="text/css" href="/tests/SimpleTest/test.css" />
+</head>
+<body>
+<p id="display"></p>
+<div id="content">
+<svg id="svg" width="120px" height="120px"
+     onload="this.pauseAnimations()">
+  <circle r="50" fill="blue" id="circle">
+    <set attributeName="cy" to="100" begin="0s" dur="100s" id="a"/>
+    <set attributeName="cx" to="100" begin="a.end" dur="100s" id="b"/>
+  </circle>
+</svg>
+</div>
+<pre id="test">
+<script class="testbody" type="text/javascript">
+
+SimpleTest.waitForExplicitFinish();
+
+function run() {
+  SpecialPowers.pushPrefEnv({"set": [["intl.accept_languages", "en"]]}, runInternal);
+}
+
+function runInternal() {
+  var svg = document.getElementById("svg"),
+      a = document.getElementById("a"),
+      b = document.getElementById("b"),
+      circle = document.getElementById("circle");
+
+  // Check initial state
+  svg.setCurrentTime(50);
+  is(a.getStartTime(), 0, "a has resolved start time at start");
+  is(circle.cy.animVal.value, 100, "a is in effect at start");
+  is(b.getStartTime(), 100, "b has resolved start time at start");
+
+  // Add a failing conditional processing test
+  a.setAttribute("systemLanguage", "no-such-language");
+  ok(hasUnresolvedStartTime(a),
+     "a has unresolved start time with failing conditional processing test");
+  is(circle.cy.animVal.value, 0,
+     "a is not in effect with failing conditional processing test");
+  ok(hasUnresolvedStartTime(b),
+     "b has unresolved start time with failing conditional processing test on a");
+
+  // Remove failing conditional processing test
+  a.removeAttribute("systemLanguage");
+  is(a.getStartTime(), 0, "a has resolved start time after removing test");
+  is(circle.cy.animVal.value, 100, "a is in effect after removing test");
+  is(b.getStartTime(), 100, "b has resolved start time after removing test on a");
+
+  // Add another failing conditional processing test
+  // According to the spec, if a null string or empty string value is set for
+  // the 'systemLanguage' attribute, the attribute returns "false".
+  a.setAttribute("systemLanguage", "");
+
+  // Fast forward until |a| would have finished
+  var endEventsReceived = 0;
+  a.addEventListener("endEvent", function() { endEventsReceived++; });
+  svg.setCurrentTime(150);
+  is(endEventsReceived, 0,
+     "a does not dispatch end events with failing condition processing test");
+  is(circle.cx.animVal.value, 0,
+     "b is not in effect with failing conditional processing test on a");
+
+  // Make test pass
+  a.setAttribute("systemLanguage", "en");
+  is(circle.cx.animVal.value, 100,
+     "b is in effect with passing conditional processing test on a");
+
+  SimpleTest.finish();
+}
+
+function hasUnresolvedStartTime(anim) {
+  // getStartTime throws INVALID_STATE_ERR when there is no current interval
+  try {
+    anim.getStartTime();
+    return false;
+  } catch (e) {
+    return true;
+  }
+}
+
+window.addEventListener("load", run);
+
+</script>
+</pre>
+</body>
+</html>