Run results for: Selector performance in JQuery 345

Run details:

User agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10.15; rv:81.0) Gecko/20100101 Firefox/81.0

Browser: Firefox 81

Operating system: Mac OS X 10.15

Device Platform: Desktop

Date tested: 4 years ago

Test name	Executions per second
case-1	311893.5 Ops/sec
case-2	605794.8 Ops/sec

HTML Preparation code:

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

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

Script Preparation code:

$(' .my-class ').css("background-color", "#cccccc"); //case-1
$(' #my-class ').css("background-color", "#cccccc"); //case-2

 
$(' .my-class ').css("background-color", "#cccccc"); //case-1$(' #my-class ').css("background-color", "#cccccc"); //case-2

Tests:

case-1
$(' .my-class ').css("background-color", "#cccccc");
$(' .my-class ').css("background-color", "#cccccc");
case-2
$(' #my-class ').css("background-color", "#cccccc");
$(' #my-class ').css("background-color", "#cccccc");