function img_fullscreen(event) {
    event.target.requestFullscreen();
}

function img360_resize() {
    const img_360 = document.getElementsByTagName("img-360");
    for (const element of img_360) {
        const w = Math.round(element.parentElement.clientWidth);
        const h = Math.round(element.parentElement.clientWidth * 0.75);
        element.style.height = h + "px";
    }
}

window.onresize = function() {
    img360_resize();
};

window.onload = function() {
    img360_resize();
}