Benchmark: jQuery CSS3 :not vs .not()

HTML Preparation code:

<div id="container">
  <div id="header">Header</div>
  <div>Div</div>
</div>
<script src='https://cdnjs.cloudflare.com/ajax/libs/jquery/3.3.1/jquery.js'></script>

Tests:

CSS3 Selector
var d = $('div:not(#header)');
.not() Method
var d = $('div').not('#header');

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
CSS3 Selector
.not() Method

Fastest: N/A

Slowest: N/A

Latest run results:

No previous run results

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Autogenerated LLM Summary (model llama3.2:3b, generated one year ago):

LLMs can make mistakes. Check important info.

Let's break down the provided benchmark and explain what's being tested, compared, and analyzed.

**Benchmark Overview**

The benchmark compares the performance of two approaches for selecting elements in jQuery: CSS3 pseudo-class `:not` versus `.not()` method.

**What's Being Tested?**

In this benchmark:

1. Two individual test cases are defined:
	* "CSS3 Selector": This test case uses a CSS3 selector (`:not`) to select an element based on its id attribute.
	* ".not() Method": This test case uses the `.not()` method provided by jQuery to select an element based on its id attribute.
2. The benchmark script is prepared using HTML and jQuery 3.3.1, which includes the CSS3 pseudo-class `:not`.
3. The benchmark is executed multiple times to gather execution counts.

**Comparison**

The comparison is between the two test cases:

* "CSS3 Selector" vs ".not() Method"

**Pros and Cons of Each Approach**

**CSS3 Pseudo-Class `:not`:**

Pros:

* More efficient, as it uses a single operation with the DOM API.
* Less JavaScript execution overhead.

Cons:

* Limited browser support (older versions might not support CSS3).
* May require additional stylesheets or CSS rules for optimal performance.

**.not() Method**

Pros:

* Widely supported across browsers and devices.
* Easy to implement and maintain.
* Can be used in conjunction with other jQuery methods.

Cons:

* More JavaScript execution overhead due to the `.not()` method call.
* Might incur additional DOM manipulation costs.

**Other Considerations**

* **Browser Support**: As mentioned earlier, CSS3 pseudo-classes are not supported by older browsers. The `.not()` method provides a more reliable fallback.
* **Performance Factors**: Other factors like JavaScript engine optimizations, caching, and concurrent execution might affect the performance results.
* **Benchmark Variance**: The benchmark may be sensitive to variance in test execution counts, which could impact the accuracy of the results.

**Library Used**

In this benchmark:

* jQuery 3.3.1 is used as the JavaScript library for executing the CSS selector and `.not()` method tests.

**Special JS Feature/Syntax**

No special JavaScript features or syntax are being tested in this benchmark. The focus is on comparing two established methods within jQuery.

**Alternatives**

If you're interested in exploring alternative approaches, consider:

* Using other CSS selectors, like `:has()` or attribute-based selectors.
* Investigating newer jQuery versions for improved performance or new methods.
* Comparing the performance of different JavaScript engines (e.g., V8 vs. SpiderMonkey).
* Evaluating the impact of caching, memoization, or other optimization techniques on benchmark results.

I hope this explanation helps you understand the provided benchmark and its comparison!

Related benchmarks:

jQuery CSS3 :not vs .not() (version: 0)

Using jQuery 3.3.1, compare speed of CSS3 pseudo-class :not versus .not() method.

Comparing performance of: CSS3 Selector vs .not() Method

Created: 8 years ago by: Guest

Jump to the latest result

CSS3 Selector

.not() Method

Suite status: <idle, ready to run>

Fastest: N/A

Slowest: N/A

No previous run results

Autogenerated LLM Summary (model llama3.2:3b, generated one year ago):