Benchmark: js Styles css text object

HTML Preparation code:

<script src="https://ajax.googleapis.com/ajax/libs/jquery/3.3.1/jquery.min.js"></script>
<script>
    var $jq331 = $.noConflict(true);
</script>

<div id="box" style="background:#555;color:#FFF;position:absolute;left:0;top:0;width:400px;height:100px;</div>

Script Preparation code:

var elem = document.getElementById('box');
console.log("elem", elem);

console.log("jq", $jq331);
var jqElem = $jq331('#box')
console.log("jqElem", jqElem);

Tests:

cssText
elem.style.cssText +=';width:300px;height:50px;';
style
elem.style.width = '300px'; elem.style.height = '50px'; elem.style.top = '40px'; elem.style.left = '90px';
jquery
jqElem.css({ 'width': 300, 'height': 50, 'top':40, 'left': 90 });
object
Object.assign(elem.style,{width:"300px",height:"50px",top:"40px",left:"90px"});

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
cssText
style
jquery
object

Fastest: N/A

Slowest: N/A

Latest run results:

Run details: (Test run date: 2 years ago)

User agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/120.0.0.0 Safari/537.36

Browser/OS: Chrome 120 on Windows

View result in a separate tab

Test name	Executions per second
cssText	41519.0 Ops/sec
style	268486.9 Ops/sec
jquery	56330.2 Ops/sec
object	299691.3 Ops/sec

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, the options compared, pros and cons of each approach, and other considerations.

**Benchmark Overview**

The provided benchmark measures the performance of different approaches for updating CSS styles on an HTML element. The test case uses jQuery, a popular JavaScript library, to manipulate the DOM.

**Script Preparation Code**

The script preparation code sets up the necessary variables and includes the jQuery library:
```javascript
var elem = document.getElementById('box');
console.log("elem", elem);

console.log("jq", $jq331);
var jqElem = $jq331('#box')
console.log("jqElem", jqElem);
```
The `$jq331` variable is created by calling `$.noConflict(true)` before loading the jQuery library. This is a common practice to avoid conflicts with other libraries.

**Html Preparation Code**

The HTML preparation code includes the necessary CSS styles and a `<div>` element with an ID of "box":
```html
<div id="box" style="background:#555;color:#FFF;position:absolute;left:0;top:0;width:400px;height:100px;</div>
```
**Individual Test Cases**

There are four test cases, each measuring the performance of a different approach:

1. **cssText**: Updates the `style` property of the element using string concatenation.
2. **style**: Sets individual CSS properties directly on the element's style object.
3. **jquery**: Uses jQuery to update the CSS styles on the element (`jqElem.css()`).
4. **object**: Uses `Object.assign()` to update the CSS styles on the element's style object.

**Pros and Cons of Each Approach**

Here's a brief summary of each approach:

* **cssText**: This approach is simple but can lead to performance issues due to string concatenation, which creates a new string object each time.
* **style**: Directly setting individual properties is faster than concatenating strings, as it avoids creating a new object and only updates the existing style.
* **jquery**: jQuery's CSS manipulation methods are generally slower than direct property access or using `Object.assign()`. However, it provides a convenient and easy-to-use API for DOM manipulation.
* **object**: Using `Object.assign()` is faster than concatenating strings or using jQuery's CSS methods, as it updates the existing style object in a single operation.

**Considerations**

* The benchmark only measures performance on Chrome 120 on Windows Desktop. Other browsers may have different performance characteristics.
* The test case uses a relatively small number of elements and styles. In a real-world scenario, you may need to consider larger datasets and more complex stylesheets.
* jQuery's CSS manipulation methods may not be suitable for all use cases, especially when working with large datasets or performance-critical applications.

**Alternatives**

If you're looking for alternative approaches, you can consider:

* Using the `style` property directly on the element: This approach avoids the overhead of creating a new object and updating the existing style.
* Using a library like Lit or React for DOM manipulation: These libraries provide optimized and performant ways to update styles, but may add additional dependencies and complexity.
* Implementing your own CSS parsing and manipulation logic: This approach requires more expertise in CSS and can be more complex than using established libraries.

Related benchmarks:

js Styles css text object (version: 0)

Comparing performance of: cssText vs style vs jquery vs object

Created: 5 years ago by: Guest

Jump to the latest result

cssText

style

jquery

object

Suite status: <idle, ready to run>

Fastest: N/A

Slowest: N/A

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