سؤال في الhtml & css

يمكنك تجريب هذا الكود:

اربط الزر عن طريق ID ثم بعد النقر يستدعي دالة تطلب وضع ملئ الشاشة

<script>
/* Get the element you want displayed in fullscreen mode (a video in this example): */
var elem = document.getElementById("myvideo");

/* When the openFullscreen() function is executed, open the video in fullscreen.
Note that we must include prefixes for different browsers, as they don't support the requestFullscreen method yet */
function openFullscreen() {
  if (elem.requestFullscreen) {
    elem.requestFullscreen();
  } else if (elem.webkitRequestFullscreen) { /* Safari */
    elem.webkitRequestFullscreen();
  } else if (elem.msRequestFullscreen) { /* IE11 */
    elem.msRequestFullscreen();
  }
}
</script>