ウェブページのような、複雑で読み込み専用の文書は、NVDAでは仮想バッファー内に表現されます。 仮想バッファーとは、文書原文のフラットな表現であり、ユーザが文書中にある本文とフィールドを読み上げさせることを可能にします。テキストが、リンクなのか見出しなのかといった情報は、移動するごとに通知されます。 While in a virtual buffer, there are two modes of interaction. Browse mode is where you can move around all the text using a virtual cursor. Focus mode is where you can directly interact with the control (edit field, combo box, radio buttons) using what ever keys you would normally use. When in Browse mode, NVDA will automatically switch to focus mode if you tab to or click on a particular control that requires it. Note that pressing enter or space on controls that require it will also switch to focus mode. You can also manually change to focus mode with NVDA+space. If NVDA automatically changed to focus mode because of a tab, click or enter/space key press, it will change back to browse mode once you tab or click on to something that doesn't require it, or if you press escape. However, if you changed to focus mode with NVDA+space, it will stay in focus mode until you manually go back to browse mode. At any time when you are in focus mode, you can manually switch back to browse mode by pressing escape, or NVDA+space. The virtual buffer settings dialog in the preferences menu in the NVDA menu allows you to disable automatic switching of browse mode and focus mode.
目下NVDAはMozilla Firefox、Microsoft Internet ExplorerとAdobe Readerにおける読み上げのために仮想バッファーを使用しています。
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