<script>
    const { webFrame, ipcRenderer } = require('electron')

    document.addEventListener('fullscreenchange', () => {
        ipcRenderer.send('fullscreenChange', webFrame.routingId)
    });

    window.addEventListener('message', ({ data }) => {
        if (data === 'exitFullscreen') {
            document.exitFullscreen()
        }
    })

    window.addEventListener('load', () => {
        window.focus()
        webFrame.executeJavaScript('document.querySelector("video").requestFullscreen()', true)
    });
</script>
<video></video>