Full-screen iframe with a height of 100%

Question

Is iframe height=100% supported in all browsers?

I am using doctype as:

Answer 1

body {
    margin: 0;            /* Reset default margin */
}
iframe {
    display: block;       /* iframes are inline by default */
    background: #000;
    border: none;         /* Reset default border */
    height: 100vh;        /* Viewport-relative units */
    width: 100vw;
}