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jsPerf.app is an online JavaScript performance benchmark test runner & jsperf.com mirror. It is a complete rewrite in homage to the once excellent jsperf.com now with hopefully a more modern & maintainable codebase.

jsperf.com URLs are mirrored at the same path, e.g:

https://jsperf.com/negative-modulo/2

Can be accessed at:

https://jsperf.app/negative-modulo/2

Test case details

Title *

Description
(Markdown syntax is allowed)

Preparation Code

Preparation HTML
(this will be inserted in the <body> of a valid HTML5 document in standards mode)
(useful when testing DOM operations or including libraries)

<script src="https://ajax.googleapis.com/ajax/libs/jquery/1/jquery.min.js"></script>

<div id="box" style="background:#555;color:#FFF;position:absolute;left:0;top:0;width:400px;height:100px;"></div>

Setup JSvar $elem = $('#box');

Teardown JS

Test cases

Test #1

Title *

Async

Code *$elem[0].style.cssText +=';width:300px;height:50px;top:40px;left:90px;';

Test #2

Title *

Async

Code *$elem[0].style.cssText +='width:300px;height:50px;top:40px;left:90px;';

Test #3

Title *

Async

Code *$elem.css({ 'width': 300, 'height': 50, 'top':40, 'left': 90 });

Test #4

Title *

Async

Code *

$elem[0].style.width = '300px';
$elem[0].style.height = '50px';
$elem[0].style.top = '40px';
$elem[0].style.left = '90px';

Test #5

Title *

Async

Code *

$elem[0].style['width'] = '300px';
$elem[0].style['height'] = '50px';
$elem[0].style['top'] = '40px';
$elem[0].style['left'] = '90px';