Position: Strange phenomenon of fixed failure

FreeNG
position: fixed
position: absolute

.fullscreen {  
  position: fixed;   
  top: 0;   
  left: 0;   
  right: 0;   
  bottom: 0;   
  background: #fff;   
  z-index: 10100;
}
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Meyerweb.com/eric/though…
Bugs.chromium.org/p/chromium/…