Comment 7 for bug 1542093

I see that CSS has finally defined 1 px to be 1/96 inch in contrast with their previous definitions "because too much existing content relies on the assumption of 96dpi, and breaking that assumption breaks the content." (https://www.w3.org/TR/css3-values/#absolute-lengths).

Now that 'CSS px' has become an absolute unit, I agree that a new (or a way to refer to the current) unit is needed.