How do I change the dpi setting when I am saving for the web?

I need to chnge the dpi setting from the default of 72 to 300 when saving for the web.  How do I do that?

You go by pixel dimensions for the web because that's all that computer screens use.
dpi or rather ppi is a print specification.
In this example, Image > Image Size    I have unchecked resampling and set the ppi to 300. You can see how small it's going to print on paper as opposed to maybe 100 ppi.  It will still retain the same pixel dimensions.
You basically focus on a good pixel size for the the browser display.

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