If you would like turn off intellisense in HTML editors (aspx, html files) and CSS editor (css files), you could do so by going to Tools->Options dialog.

For HTML editor, go to Tools->Options->HTML->General. In the right pane, under Statement Completion, uncheck "Auto list members"

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For CSS Editor, go to Tools->Options->Text Editor->CSS->General. In the right pane, under Statement Completion, uncheck “Auto list members”

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Ranjini Mathrubootham

SDET, Visual Web Developer