Run results for: elem.ownerDocument.defaultView.getComputedStyle vs window.getComputedStyle

Run details:

User agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/104.0.5112.102 Safari/537.36

Browser: Chrome 104

Operating system: Windows

Device Platform: Desktop

Date tested: 2 years ago

Test name	Executions per second
ownerDocument.defaultView	1899320.9 Ops/sec
window.getComputedStyle	1618832.6 Ops/sec

HTML Preparation code:

<div id="root"><div>

AخA
 
<div id="root"><div>

Script Preparation code:

var el = document.getElementById("root");
function getStyle(elem){
  return elem.ownerDocument.defaultView.getComputedStyle( elem );
}

function getStyle2(elem){
  return window.getComputedStyle( elem );
}

​x
 
var el = document.getElementById("root");function getStyle(elem){  return elem.ownerDocument.defaultView.getComputedStyle( elem );}​function getStyle2(elem){  return window.getComputedStyle( elem );}

Tests:

ownerDocument.defaultView
var computedStyle = getStyle(el);
var computedStyle = getStyle(el);
window.getComputedStyle
var computedStyle = getStyle2(el);
var computedStyle = getStyle2(el);