JS

DOMContentLoaded 與 load 事件

DOM load

document.addEventListener("DOMContentLoaded", function(){
  // DOM Ready!
});

全部元素 load

window.addEventListener("load", function(event) {
  // All resources finished loading!
});

子母畫面(Pip)

function togglePictureInPicture() {
  if (document.pictureInPictureElement) {
    document.exitPictureInPicture();
  } else if (document.pictureInPictureEnabled) {
    video.requestPictureInPicture();
  }
}

click Event 阻止向下傳遞

e.stopPropagation();