Benchmark: Css vs javascript add class

HTML Preparation code:

.mystyle {	
  color: red;
}
<div id="myDIV">
I am a DIV element
</div>

Tests:

java
document.getElementById("myDIV").style.color = "red";
css
document.getElementById("myDIV").classList.add("mystyle");

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
java
css

Fastest: N/A

Slowest: N/A

Autogenerated LLM Summary (model llama3.2:3b, generated 25 days ago):

LLMs can make mistakes. Check important info.

Let's break down the benchmark definition and test cases to understand what is being tested.

**Benchmark Definition JSON:**

The provided JSON represents a JavaScript microbenchmark that tests two approaches for adding a class to an HTML element:

1. **CSS:** The "Html Preparation Code" section sets up an HTML structure with a `<div>` element and defines a CSS rule `.mystyle` that styles the text color to red.
2. **JavaScript (using `classList.add()`):** The "Script Preparation Code" is empty, but it's implied that a script will be executed to add the class `mystyle` to the `<div>` element using the `classList.add()` method.

The benchmark definition doesn't specify any libraries or special JavaScript features beyond what's required for these two approaches.

**Individual Test Cases:**

There are only two test cases:

1. **"java" (JavaScript approach):**
	* The "Benchmark Definition" is a script that adds a class `mystyle` to the `<div>` element using `document.getElementById()` and then calls the `classList.add()` method.
2. **"css" (CSS approach):**
	* The "Benchmark Definition" is an empty script, but it's implied that the CSS rule defined in the "Html Preparation Code" will be applied to style the text color of the `<div>` element.

**Pros and Cons:**

1. **CSS Approach:**
	* Pros:
		+ Easier to read and maintain, as it uses a clear and concise syntax.
		+ Faster execution time, since CSS rules are executed at compile-time rather than runtime.
	* Cons:
		+ Less control over the styling process, as CSS rules are applied globally or using specific selectors.
2. **JavaScript Approach (using `classList.add()`):**
	* Pros:
		+ More flexibility and control over the styling process, since JavaScript can dynamically manipulate the element's class list.
	* Cons:
		+ Slower execution time, since JavaScript code is executed at runtime.

**Other Alternatives:**

1. **Using a CSS-in-JS library:** Instead of using `classList.add()`, you could use a CSS-in-JS library like styled-components or emotion to manage your application's styles.
2. **Applying a global stylesheet:** You could apply a global stylesheet instead of defining it in the HTML document, which might reduce execution time but would require more setup and maintenance.

**Library:**

The `classList` property is a built-in feature of modern browsers, allowing you to dynamically manipulate an element's class list using JavaScript. However, if you're looking for additional styling options or features, you might consider using a CSS-in-JS library or a global stylesheet.

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/605.1.15 (KHTML, like Gecko) Version/15.6.1 Safari/605.1.15

Browser/OS: Safari 15 on Mac OS X 10.15.7

View result in a separate tab

Test name	Executions per second
java	1278001.6 Ops/sec
css	1619798.2 Ops/sec

Related benchmarks:

Css vs javascript add class (version: 0)

Comparing performance of: java vs css

Created: 3 years ago by: Guest

Jump to the latest result

java

css

Suite status: <idle, ready to run>

Experimental features:

Fastest: N/A

Slowest: N/A

Autogenerated LLM Summary (model llama3.2:3b, generated 25 days ago):