<!doctype html><title>CSS test reference</title><metacharset="utf-8"><style>.test{width:1em;height:1em;background-color:green;display:inline-block;}#t1{font-size:1vh;}#t2{font-size:1vw;}#t3{font-size:1vh;}#t4{font-size:1vw;}</style><divclass="test"id="t1"></div><divclass="test"id="t2"></div><divclass="test"id="t3"></div><divclass="test"id="t4"></div>