Run results for: CSS selector best performance

Run details:

User agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/605.1.15 (KHTML, like Gecko) Version/18.1.1 Safari/605.1.15

Browser: Safari 18

Operating system: Mac OS X 10.15.7

Device Platform: Desktop

Date tested: 3 months ago

Test name	Executions per second
case-1	1064645.6 Ops/sec
case-2	1053875.1 Ops/sec
case-3	1065710.1 Ops/sec
case-4	1070441.9 Ops/sec
case-5	1070326.9 Ops/sec
case-6	1007673.5 Ops/sec
case-7	1073927.5 Ops/sec
case-8	1387953.0 Ops/sec

HTML Preparation code:

<div id="my-id">
    <div class="grand">
        <div class="my-class">
            <p> I like carrots! </p>
        </div>
    </div>
</div>
<script src='https://cdnjs.cloudflare.com/ajax/libs/jquery/3.3.1/jquery.js'></script>

Tests:

case-1
$(' div#my-id div.grand div.my-class ').css("background-color", "#cccccc");
case-2
$(' #my-id .grand div.my-class ').css("background-color", "#cccccc");
case-3
$(' #my-id .grand .my-class ').css("background-color", "#cccccc");
case-4
$(' div#my-id div.my-class ').css("background-color", "#cccccc");
case-5
$(' #my-id div.my-class ').css("background-color", "#cccccc");
case-6
$(' #my-id .my-class ').css("background-color", "#cccccc");
case-7
$(' div.my-class ').css("background-color", "#cccccc");
case-8
$(' .my-class ').css("background-color", "#cccccc");

Run results for: CSS selector best performance

To measure how more specific selectors affect performance

case-1

case-2

case-3

case-4

case-5

case-6

case-7

case-8