Benchmark: Set style vs setAtrribute("style")

Script Preparation code:

  var elem = document.createElement('div');
  elem.style = 'background:#555;color:#FFF;position:absolute;left:0;top:0;width:400px;height:100px;';

Tests:

style by property
for (var i = 0; i< 1000 ; i++){ elem.style.width = i + 'px'; elem.style.height = i + 'px'; elem.style.top = i + 'px'; elem.style.left = i + 'px'; }
style by name
for (var i = 0; i< 1000 ; i++){ elem.style['width'] = i + 'px'; elem.style['height'] = i + 'px'; elem.style['top'] = i + 'px'; elem.style['left'] = i + 'px'; }
setAttribute
for (var i = 0; i< 1000 ; i++){ elem.setAttribute('style','width:' + i + 'px;height:' + i + 'px;top:' + i + 'px;left:' + i + 'px;'); }

Rendered benchmark preparation results:

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Set style vs setAtrribute("style") (version: 0)