is it possible in html to make width with 2 size types?

I'm learning html and, I asked can you make width with 2 size types or more, like I want width to be 10px+3vw it isn't possible like that but is there a way like typecasting or something to make it work, since I know 3 types of sizing width 1-XX% ,2-XXpx and 3-XXvw can you use the three of them in a single width attribute to have full control on its width ?