You can use special codes to generate diacritics in your HTML documents. For example, the combination Release both keys and type "o".
For example, to type c'est, type c then ' then hit the spacebar then type e s t. The Shift key option only works for those shortcuts utilizing the Shift key, as listed below. You might want to use stickers to indicate which keys are which, since the French keyboard is somewhat different from the standard US keyboard.
Select the desired accented character or symbol from the list of symbols.
How do I get letters with accent marks in Microsoft Word?