[css] Putting -moz-available and -webkit-fill-available in one width (css property)

I want to make the width of the footer browser-independent.

For Mozilla I want to use the value of -moz-available, and when a user uses Opera, then CSS should get the values from -webkit-fill-available.

How to do this in CSS3?

I tried to do something like this:

width: -moz-available, -webkit-fill-available;

This won't give the desired results.

This question is related to css responsive-design

The answer is


I needed my ASP.NET drop down list to take up all available space, and this is all I put in the CSS and it is working in Firefox and IE11:

width: 100%

I had to add the CSS class into the asp:DropDownList element