.foo {
	margin: 10vw 20vh;
	margin: 10vi 20vb;
}

.foo {
	margin: calc(10vw + 5vh);
	margin: calc(10vi + 5vb);
}

.vb {
	left: 5vh;
	left: 5vb;
}

.vi {
	left: 5vw;
	left: 5vi;
}

@supports (width: 100vb) {
	.vi {
		left: 5vi;
	}
}

:root {
	--var: 5vw;
}

@supports (top: 1vi) {

:root {
	--var: 5vi;
}
}

.fallback {
	left: 5vw;
	left: 5vi;
}

to-clone {
	left: 5vw;
	left: 5vi;
}
