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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)

<style>
.base{
display: inline-block;
width:300px;
height:300px;
 border:1px solid black;
}

.red {
color:red; 
}
.bold{
  font-weight:bold;
}
.upper{
  text-transform:uppercase;
}
</style>

<div id="dom" class="base">
    test
</div>

Setup JS

Teardown JS

Test cases

Test #1

Title *

Async

Code *

var div = document.getElementById("dom");
div.className = "base";
div.classList.add("red");
div.classList.add("bold");
div.classList.add("upper");

Test #2

Title *

Async

Code *

var div = document.getElementById("dom");
div.className = "base";
div.className += "red bold upper";