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Unfortunately, every large piece of software contains bugs.

Given this reality, we can hope to reduce the severity of vulnerabilities by isolating a browser's complex components and reducing their privileges.

We use exploit barriers, such as address-space layout randomization, to make it more difficult to exploit vulnerabilities in the Java Script sandbox.

We then use a sandbox at the operating-system level to limit the process itself from causing damage, even if exploits escape the earlier security mechanisms.

The rendering engine parses HTML, executes Java Script, decodes images, paints to an off-screen buffer, and performs other tasks necessary for rendering Web pages.