How to reference a Verge 3d varible in a Javascript Code Puzzle

yeah, its the freaking forum that is breaking the code.

let elem = document.getElementById(gamescreen);

function fullscreen() {
if (elem.requestFullscreen) {
elem.requestFullscreen();
window.PetraBasicSpeed = 0.007;
console.log('PetraBasicSpeed set (standard):', window.PetraBasicSpeed);
} else if (elem.webkitRequestFullscreen) { // Safari
elem.webkitRequestFullscreen();
window.PetraBasicSpeed = 0.12;
console.log("PetraBasicSpeed set (webkit):", window.PetraBasicSpeed);
} else if (elem.msRequestFullscreen) { // IE11
elem.msRequestFullscreen();
window.PetraBasicSpeed = 0.25;
console.log("PetraBasicSpeed set (ms):", window.PetraBasicSpeed);
}
}

' is not the same as this ‘

which is why it was breaking