Run results for: Check data attribute: hasAttribute vs dataset

Run details:

User agent: Mozilla/5.0 (iPhone; CPU iPhone OS 18_3_2 like Mac OS X) AppleWebKit/605.1.15 (KHTML, like Gecko) CriOS/134.0.6998.99 Mobile/15E148 Safari/604.1

Browser: Chrome Mobile iOS 134

Operating system: iOS 18.3.2

Device Platform: Mobile

Date tested: one year ago

Test name	Executions per second
hasAttribute	19405950.0 Ops/sec
dataset	9333133.0 Ops/sec

HTML Preparation code:

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

Script Preparation code:

var element = document.getElementById("foo");

Tests:

hasAttribute
var foo = element.hasAttribute("data-foo");
dataset
var foo = "foo" in element.dataset;

Run results for: Check data attribute: hasAttribute vs dataset

Compare hasAttribute to in dataset

hasAttribute

dataset