The offsetTop calculation for elements that are contained as children of scrolled elements may be reported incorrectly in Windows Internet Explorer 8

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Article ID: 976948 - View products that this article applies to.
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INTRODUCTION

Cumulative security update for Internet Explorer 974455 (described in Microsoft security bulletin MS09-054) introduced new logic to calculate the value of the offsetTop property. Under certain scenarios, the value of the offsetTop property may be calculated incorrectly.

SYMPTOMS

When Internet Explorer 8 runs in standards mode, it may incorrectly calculate the value of the offsetTop property if the following conditions are true:
  • The Web page uses the offsetTop property to determine the top position for elements.
  • The elements are absolute children of scrolled elements.
  • Cumulative security update for Internet Explorer 974455 is installed.
The offsetTop property is used to calculate the top position of the object in relation to the layout or coordinate parent. For more information, visit the following Microsoft MSDN Web page:
http://msdn.microsoft.com/en-us/library/ms534303(VS.85).aspx
For more information about MS09-054, click the following article number to view the article in the Microsoft Knowledge Base:
974455 MS09-054: Cumulative security update for Internet Explorer

CAUSE

Cumulative security update for Internet Explorer 974455 (described in security bulletin MS09-054) was released to address identified security vulnerabilities in Internet Explorer. As part of the cumulative security update, Internet Explorer introduced additional logic to calculate the values of the offsetTop property. This additional logic did not account for certain scenarios in which the offsetTop property was requested for elements that are absolute children of scrolled elements.

RESOLUTION

To resolve this problem, install update 976749 after you install cumulative security update 974455. For more information about update 976749, click the following article number to view the article in the Microsoft Knowledge Base:
976749 An update is available for Internet Explorer that resolves issues that occur after you apply security update 974455 (MS09-054)

Important Do not install update 976749 if you have not installed cumulative security update 974455. If you install update 976749 without first installing cumulative security update 974455, Internet Explorer may not work correctly. If this occurs, uninstall update 976749, install cumulative security update 974455, and then reinstall update 976749.

STATUS

Microsoft has confirmed that this is a problem in the Microsoft products that are listed in the "Applies to" section.
Note This is a "FAST PUBLISH" article created directly from within the Microsoft support organization. The information contained herein is provided as-is in response to emerging issues. As a result of the speed in making it available, the materials may include typographical errors and may be revised at any time without notice. See Terms of Use for other considerations.

Properties

Article ID: 976948 - Last Review: July 1, 2010 - Revision: 2.0
APPLIES TO
  • Windows Internet Explorer 8, when used with:
    • Windows Server 2008 Datacenter without Hyper-V
    • Windows Server 2008 Enterprise without Hyper-V
    • Windows Server 2008 for Itanium-Based Systems
    • Windows Server 2008 Standard without Hyper-V
    • Windows Server 2008 Datacenter
    • Windows Server 2008 Enterprise
    • Windows Server 2008 Standard
    • Windows Web Server 2008
    • Windows Server 2008 R2 Datacenter
    • Windows Server 2008 R2 Enterprise
    • Windows Server 2008 R2 Standard
    • Windows 7 Enterprise
    • Windows 7 Home Basic
    • Windows 7 Home Premium
    • Windows 7 Professional
    • Windows 7 Ultimate
    • Windows Vista Business
    • Windows Vista Enterprise
    • Windows Vista Home Basic
    • Windows Vista Home Premium
    • Windows Vista Ultimate
    • Windows Vista Enterprise 64-bit Edition
    • Windows Vista Home Basic 64-bit Edition
    • Windows Vista Home Premium 64-bit Edition
    • Windows Vista Ultimate 64-bit Edition
    • Windows Vista Business 64-bit Edition
    • Microsoft Windows XP Professional
    • Microsoft Windows XP Home Edition
    • Microsoft Windows XP Professional x64 Edition
    • Microsoft Windows Server 2003, Datacenter x64 Edition
    • Microsoft Windows Server 2003, Enterprise x64 Edition
    • Microsoft Windows Server 2003, Standard x64 Edition
    • Microsoft Windows Server 2003, Web Edition
    • Microsoft Windows Server 2003, Standard Edition (32-bit x86)
    • Microsoft Windows Server 2003, Enterprise Edition (32-bit x86)
    • Microsoft Windows Server 2003, Datacenter Edition (32-bit x86)
    • Microsoft Windows Server 2003, Datacenter Edition for Itanium-Based Systems
    • Microsoft Windows Server 2003, Enterprise Edition for Itanium-based Systems
  • Microsoft Security Essentials
Keywords: 
kbbug kbexpertiseinter kbsecurity kbsurveynew KB976948

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