For IE you could simply have a "theme-dark.css" and "theme-light.css" (and also "theme-print.css" for... Printing) then use server or JavaScript code to include the suitable CSS file on the fly.
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For IE you could simply have a "theme-dark.css" and "theme-light.css" (and also "theme-print.css" for... Printing) then use server or JavaScript code to include the suitable CSS file on the fly.