<body>
<webview id="webview" nodeintegration="on" webpreferences="contextIsolation=no" src="frame.html"/>
<script type="text/javascript" charset="utf-8">
document.addEventListener('fullscreenchange', () => {
require('electron').ipcRenderer.send('fullscreenchange')
})
function isIframeFullscreen() {
return document.getElementById('webview').shadowRoot.lastElementChild.matches(':fullscreen')
}
</script>
</body>