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Framekiller
A framekiller (or framebuster or framebreaker) is a technique used by web applications to prevent their web pages from being displayed within a frame. A frame is a subdivision of a Web browser window and can act like a smaller window. It's usually deployed to prevent a frame from an external Web site being loaded from within a frameset without permission often as part of clickjacking attack.
==Implementations==
Framekillers are implemented using JavaScript that validates if the current window is the main window. The recommended approach is to block rendering of the window by default and only unblock it after confirming the current window is the main one:
This approach was proposed in 2010 by Gustav Rydstedt, Elie Bursztein, Dan Boneh and Collin Jackson in a paper that highlighted the limitations of existing frame-busting techniques along with techniques allowing to bypass them.
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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