Benchmark: DataAttribute vs Class Selector vs ID Selector -- complex version2

HTML Preparation code:

<header>header</header>
<main class="main" id="main" main>
  <div>
    <span>Title</span>
  	<div class="hello" id="hello" hello>Hello</div>
    <span>World</span>
  </div>
</main>
<footer>header</footer>

Tests:

Class
document.querySelector('.hello');
ID
document.querySelector('#hello');
data attribute
document.querySelector('[hello]');

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
Class
ID
data attribute

Fastest: N/A

Slowest: N/A

Latest run results:

Run details: (Test run date: one year ago)

User agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/128.0.0.0 Safari/537.36

Browser/OS: Chrome 128 on Mac OS X 10.15.7

View result in a separate tab

Test name	Executions per second
Class	713530.7 Ops/sec
ID	610520.6 Ops/sec
data attribute	541763.5 Ops/sec

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

LLMs can make mistakes. Check important info.

Let's dive into the world of JavaScript microbenchmarks on MeasureThat.net.

**What is being tested?**

The provided benchmark tests three different ways to select an element in an HTML document:

1. **Class Selector**: `document.querySelector('.hello');`
2. **ID Selector**: `document.querySelector('#hello');`
3. **Data Attribute**: `document.querySelector('[hello]');`

These methods are used to retrieve an element from the DOM based on its class, ID, or data attribute.

**Options comparison**

The benchmark compares the performance of these three methods:

* Class Selector: uses a CSS selector syntax to find an element with the specified class.
* ID Selector: uses the `id` attribute to identify a specific element.
* Data Attribute: uses a custom attribute (data-hello) to identify the element.

**Pros and Cons**

Here's a brief summary of each approach:

### Class Selector

Pros:

* Portable across browsers, as long as the CSS selector syntax is supported.
* Can be used for multiple elements with the same class.

Cons:

* May not work in older browsers that don't support CSS selectors (e.g., Internet Explorer).
* Can be slower than ID or data attribute selectors if the document has many elements with the same class.

### ID Selector

Pros:

* Fast and efficient, as it directly accesses the element by its unique `id` attribute.
* Works consistently across all browsers that support DOM manipulation.

Cons:

* Limited to only one element per ID, making it less flexible than class selectors or data attributes.
* Can be slower if the document has many elements with different IDs.

### Data Attribute

Pros:

* Flexible and can be used for multiple elements with the same data attribute value.
* Works in modern browsers that support custom attributes.

Cons:

* Less portable across older browsers, as some may not support custom attributes or have different syntax.
* Can introduce additional overhead due to parsing and checking the attribute value.

**Library usage**

None of these methods use a specific JavaScript library. However, the `document.querySelector` method is part of the DOM API, which is built-in to most modern browsers.

**Special JS features or syntax**

There are no special JavaScript features or syntax used in this benchmark. The focus is on comparing the performance of different DOM selection methods.

**Other alternatives**

If you're interested in exploring other DOM selection methods, here are a few alternatives:

* `document.getElementById`: selects an element by its ID.
* `element.getElementsByTagName`: selects elements with a specific tag name and returns a NodeList.
* `Array.prototype.forEach.call(element.querySelectorAll(' selector'))`: uses a CSS selector to select elements and then iterates over them using `forEach`.

These methods may have different performance characteristics and use cases, depending on your specific requirements.

Related benchmarks:

DataAttribute vs Class Selector vs ID Selector -- complex version2 (version: 0)

Comparing performance of: Class vs ID vs data attribute

Created: one year ago by: Guest

Jump to the latest result

Class

ID

data attribute

Suite status: <idle, ready to run>

Fastest: N/A

Slowest: N/A

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