Do you mean the following issue?
Microsoft Knowledge Base Article - 235239
Pressing BACKSPACE Key in Text Input Box When Web Page Is Inactive Causes Browser to Move Through Browser History
This article was previously published under Q235239
SYMPTOMS
When you press the BACKSPACE key (or click Back ) in a text input box on a Web page and the page is not active for a brief period of time, the browser moves back through the browser history.
CAUSE
This behavior occurs because of a timing issue in Internet Explorer.
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