JAVASCRIPT

detect fullscreen mode

window.addEventListener('resize', (evt) => { 
    if (window.innerHeight == screen.height) {
        console.log('FULL SCREEN');
    } else {
        console.log('NORMAL SCREEN');
    }
});

Detect fullscreen

window.addEventListener('resize', (evt) => {
    if (window.innerHeight == screen.height) {
        console.log('FULL SCREEN');
    } else {
        console.log('NORMAL SCREEN');
    }
});