Benchmark: setAttribute vs style

HTML Preparation code:

<div id="foo"></div>

Tests:

setAttribute
var element = document.getElementById("foo"); var i = 10000; while (i--) { element.setAttribute("style", "width: "+i+"px; height: "+i+"px;"); }
style
var element = document.getElementById("foo"); var i = 10000; while (i--) { element.style.width = i+"px"; element.style.height = i+"px"; }

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
setAttribute
style

Fastest: N/A

Slowest: N/A

Latest run results:

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

User agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/146.0.0.0 Safari/537.36

Browser/OS: Chrome 146 on Windows

View result in a separate tab

Test name	Executions per second
setAttribute	192.6 Ops/sec
style	370.3 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, compared, and other considerations.

**Benchmark Overview**

The test case measures the performance difference between setting CSS styles using `setAttribute` versus `style`. The goal is to determine which approach is faster and more efficient in this specific scenario.

**Test Cases**

There are two individual test cases:

1. **setAttribute**: This test case uses a while loop to set the `width` and `height` attributes of an HTML element using `setAttribute`. The attribute values are dynamically generated based on a counter variable `i`.
2. **style**: This test case also uses a while loop, but sets CSS styles directly on the `style` property of the same HTML element. Again, the style values are generated based on the counter variable `i`.

**Library and Syntax**

Neither of these test cases explicitly uses any libraries or advanced JavaScript features. However, it's worth noting that setting CSS properties using `setAttribute` is generally considered a less efficient approach than setting them directly via the `style` property.

**Comparison of Approaches**

The comparison between `setAttribute` and `style` can be broken down into pros and cons:

* **setAttribute**: Pros:
	+ Wide compatibility across different browsers.
	+ Can be used to set attributes that are not directly supported by CSS (e.g., `title`, `alt`).
Cons:
	+ Generally less efficient than setting styles via the `style` property, as it involves a separate attribute name and value pair.
* **style**: Pros:
	+ More efficient than using `setAttribute`, as it avoids an additional attribute operation.
	+ Provides better performance and cache hits for frequently accessed styles.

**Other Considerations**

When writing this benchmark, you should consider the following:

* Make sure to test in a controlled environment with similar hardware configurations to ensure accurate results.
* Use a consistent JavaScript engine (e.g., V8) across different browsers to minimize variations in execution speed.
* Ensure that the HTML element being tested is properly initialized and rendered before running the benchmark.

**Alternatives**

If you want to explore alternative approaches or add more test cases, consider the following:

* **Using `CSS` API**: Instead of setting styles via JavaScript, use the CSS `CSSStyleDeclaration` API to set styles. This approach can be faster and more efficient than using `style`.
* **Using a library like Lodash**: If you need to perform more complex attribute manipulation or style settings, consider using a utility library like Lodash.
* **Testing other attributes**: Expand on this benchmark by testing the performance of setting other CSS properties (e.g., `background-color`, `color`) via both `setAttribute` and `style`.

Related benchmarks:

setAttribute vs style (version: 0)

Comparing performance of: setAttribute vs style

Created: 8 years ago by: Guest

Jump to the latest result

setAttribute

style

Suite status: <idle, ready to run>

Fastest: N/A

Slowest: N/A

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