pico.chat/apps/screen.js

const ScreenShare = {
    isOn: false,
    start() {
        const screen = document.querySelector('video.screen')
        navigator.mediaDevices.getDisplayMedia()
            .then(s => {screen.srcObject = s})
            .catch(e => console.error(e))
    },
    toggle() {
        ScreenShare.isOn = !ScreenShare.isOn
        ScreenShare.start()
    },
    view() {
        const style = {
            width: '80%',
            height: '80%',
        }
        return m('video.screen[playsinline][autoplay]', {style})
    },
}