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diff --git a/dom/indexedDB/test/test_filehandle_truncate.html b/dom/indexedDB/test/test_filehandle_truncate.html
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+<!--
+ Any copyright is dedicated to the Public Domain.
+ http://creativecommons.org/publicdomain/zero/1.0/
+-->
+<html>
+<head>
+ <title>File Handle Test</title>
+
+ <script type="text/javascript" src="/tests/SimpleTest/SimpleTest.js"></script>
+ <link rel="stylesheet" type="text/css" href="/tests/SimpleTest/test.css"/>
+
+ <script type="text/javascript;version=1.7">
+ function testSteps()
+ {
+ const name = window.location.pathname;
+
+ var testBuffer = getRandomBuffer(100000);
+
+ let request = indexedDB.open(name, 1);
+ request.onerror = errorHandler;
+ request.onsuccess = grabEventAndContinueHandler;
+ let event = yield undefined;
+
+ let db = event.target.result;
+ db.onerror = errorHandler;
+
+ request = db.createMutableFile("test.bin");
+ request.onerror = errorHandler;
+ request.onsuccess = grabEventAndContinueHandler;
+ event = yield undefined;
+
+ let mutableFile = event.target.result;
+ mutableFile.onerror = errorHandler;
+
+ let fileHandle = mutableFile.open("readwrite");
+ request = fileHandle.write(testBuffer);
+ request.onsuccess = grabEventAndContinueHandler;
+ event = yield undefined;
+
+ is(fileHandle.location, 100000, "Correct location");
+
+ for (let i = 0; i < 10; i++) {
+ let location = fileHandle.location - 10000;
+ fileHandle.location = location;
+
+ request = fileHandle.truncate();
+ request.onsuccess = grabEventAndContinueHandler;
+ event = yield undefined;
+
+ is(fileHandle.location, location, "Correct location");
+
+ request = fileHandle.getMetadata({ size: true });
+ request.onsuccess = grabEventAndContinueHandler;
+ event = yield undefined;
+
+ is(event.target.result.size, location, "Correct size");
+ }
+
+ request = fileHandle.write(testBuffer);
+ request.onsuccess = grabEventAndContinueHandler;
+ event = yield undefined;
+
+ let location = fileHandle.location;
+ for (let i = 0; i < 10; i++) {
+ location -= 10000;
+
+ request = fileHandle.truncate(location);
+ request.onsuccess = grabEventAndContinueHandler;
+ event = yield undefined;
+
+ is(fileHandle.location, location, "Correct location");
+
+ request = fileHandle.getMetadata({ size: true });
+ request.onsuccess = grabEventAndContinueHandler;
+ event = yield undefined;
+
+ is(event.target.result.size, location, "Correct size");
+ }
+
+ finishTest();
+ yield undefined;
+ }
+ </script>
+ <script type="text/javascript;version=1.7" src="file.js"></script>
+ <script type="text/javascript;version=1.7" src="helpers.js"></script>
+
+</head>
+
+<body onload="runTest();"></body>
+
+</html>