When an attached or element
behavior is dynamically added and then removed in an HTML page, memory is not deallocated.
This problem is caused by a synchronization issue between
Microsoft Internet Explorer and the script engine.
To resolve this problem, obtain the latest service pack for Internet Explorer 6. For more information, click the following article number to view the article in the Microsoft Knowledge Base:
How to obtain the latest service
pack for Internet Explorer 6
A supported hotfix is available from Microsoft. However, this hotfix is intended to correct only the problem that is described in this article. Apply this hotfix only to systems that are experiencing this specific problem. This hotfix might receive additional testing. Therefore, if you are not severely affected by this problem, we recommend that you wait for the next software update that contains this hotfix.
If the hotfix is available for download, there is a "Hotfix download available" section at the top of this Knowledge Base article. If this section does not appear, contact Microsoft Customer Service and Support to obtain the hotfix. Note
If additional issues occur or if any troubleshooting is required, you might have to create a separate service request. The usual support costs will apply to additional support questions and issues that do not qualify for this specific hotfix. For a complete list of Microsoft Customer Service and Support telephone numbers or to create a separate service request, visit the following Microsoft Web site: Note
The "Hotfix download available" form displays the languages for which the hotfix is available. If you do not see your language, it is because a hotfix is not available for that language.
The English version of this fix has the file
attributes (or later) that are listed in the following table. The dates and
times for these files are listed in coordinated universal time (UTC). When you
view the file information, it is converted to local time. To find the
difference between UTC and local time, use the Time Zone
tab in the Date and Time tool in Control Panel.
has confirmed that this is a problem in the Microsoft products that are listed
at the beginning of this article.
This problem was first corrected in Internet
Explorer 6 Service Pack 1.
The fix for the issue is already present in Internet Explorer 7 and Internet Explorer 8, however the fix needs to be enabled by setting the registry entry mentioned in the following section.
Serious problems might occur if you modify the registry incorrectly by using Registry Editor or by using another method. These problems might require that you reinstall the operating system. Microsoft cannot guarantee that these problems can be solved. Modify the registry at your own risk.
This fix is included in Internet Explorer 6 SP1, and in later versions of Internet Explorer as listed in the "Applies To" section. However, by default, it is disabled. To enable this fix, set the following registry value to a string value of "yes" or to a binary value of 1:
HKEY_CURRENT_USER\Software\Microsoft\Internet Explorer\Main\Cleanup HTCs
For more information, click the following article number to view the article in the Microsoft Knowledge Base:
BUG: Memory leak occurs when you remove behaviors
For this fix to take effect, the code must meet
the following requirements:
- The behavior must have only one script element, and all
script (such as inline event handlers) in the .htc file must use the same
language as the single script element.
- The script element can use the SRC attribute with no limit in the code size in the referenced file.
However, the size of the script
file referenced in the src attribute or the script code in the script tags must
be at least 512 bytes.
This fix is only for lightweight HTML Components (HTCs). Support
for regular HTCs would require architectural changes in both Mshtml and Jscript
that were not feasible. Possible workarounds for regular HTCs include:
- Make the HTC a lightweight HTC.
- Navigate the page to reclaim memory.