Run results for: window.getComputedStyle vs. getBoundingClientRect width calculation - MeasureThat.net

Run details:

User agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/116.0.0.0 Safari/537.36

Browser: Chrome 116

Operating system: Mac OS X 10.15.7

Device Platform: Desktop

Date tested: one year ago

Test name	Executions per second
getComputedStyle	43.9 Ops/sec
getBoundingClientRect	66.3 Ops/sec

HTML Preparation code:

<div id="foo">This is a text</div>

AخA
 
<div id="foo">This is a text</div>

Tests:

getComputedStyle
var i = 5000; while (i--) { checkDisplay('foo'); } function checkDisplay(id) { return window.getComputedStyle(document.getElementById(id), null).getPropertyValue("width"); }
x

var i = 5000;
while (i--) {
checkDisplay('foo');
}

function checkDisplay(id) {
return window.getComputedStyle(document.getElementById(id), null).getPropertyValue("width");
}
getBoundingClientRect
var i = 5000; while (i--) { checkDisplay('foo'); } function checkDisplay(id) { return document.getElementById(id).getBoundingClientRect().width; }
var i = 5000;
while (i--) {
checkDisplay('foo');
}

function checkDisplay(id) {
return document.getElementById(id).getBoundingClientRect().width;
}