Run results for: window.getComputedStyle vs. getBoundingClientRect

Run details:

User agent: Mozilla/5.0 (iPad; CPU iPhone OS 15_7 like Mac OS X) AppleWebKit/605.1.15 (KHTML, like Gecko) Version/15.7 Mobile/15E148 Safari/604.1 Lark/7.18.0 LarkLocale/zh_CN ChannelName/Feishu LKBrowserIdentifier/9CDAAB05-A318-4BFF-A0F4-DDEB290D30C1

Browser: Mobile Safari 15

Operating system: iOS 15.7

Device Platform: Tablet

Date tested: 2 years ago

Test name	Executions per second
getComputedStyle	321.1 Ops/sec
getBoundingClientRect	394.0 Ops/sec

HTML Preparation code:

<div id="foo"></div>

Tests:

getComputedStyle
var i = 5000; while (i--) { checkDisplay('foo'); } function checkDisplay(id) { return window.getComputedStyle(document.getElementById(id), null).getPropertyValue("display") === "none"; }
getBoundingClientRect
var i = 5000; while (i--) { checkDisplay('foo'); } function checkDisplay(id) { return document.getElementById(id).getBoundingClientRect().width === 0; }