Benchmark: window.getComputedStyle vs. className

HTML Preparation code:

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

Tests:

getComputedStyle
var i = 3000; while (i--) { chekele('foo'); } function chekele(element) { return window.getComputedStyle(document.getElementById(element), null).getPropertyValue("display").indexOf('none') === -1; }
className
var i = 3000; while (i--) { chekele('foo'); } function chekele(element) { return document.getElementById(element).className.indexOf('hide') === -1; }

Historical Performance Data aggregated from 83 community runs

Desktop Results:

Chrome 72 runs

className

4K/s

getComputedStyle

677/s

Fastest: className (5.3x faster)

View exact numbers

✓ className: 3,586 ops/sec
• getComputedStyle: 677 ops/sec

Firefox 11 runs

className

3K/s

getComputedStyle

374/s

Fastest: className (7.0x faster)

View exact numbers

✓ className: 2,604 ops/sec
• getComputedStyle: 374 ops/sec

Results show median performance across all community submissions. Run this benchmark yourself to verify on your device.

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
getComputedStyle
className

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/138.0.0.0 Safari/537.36

Browser/OS: Chrome 138 on Mac OS X 10.15.7

View result in a separate tab

className

22K/s

getComputedStyle

2K/s

View exact numbers

Test name	Executions per second
✓ className	21,729 Ops/sec
getComputedStyle	2,053 Ops/sec

Autogenerated LLM Summary (model gemma2:9b, generated one year ago):

LLMs can make mistakes. Check important info.

This benchmark compares two methods for checking if an HTML element is visible:

**Method 1: `window.getComputedStyle`**

* This method retrieves the computed style of an element, including its display property. It then checks if the 'display' value includes 'none', indicating the element is hidden. 
    * **Pros:** More accurate as it considers all CSS rules applied to the element, potentially even inherited ones.
    * **Cons:**  Can be slower due to the need to parse and analyze the entire computed style object.

**Method 2: `className`**

* This method directly checks if the HTML element has a specific class (presumably 'hide') which is assumed to indicate an invisible element.
    * **Pros:** Simpler and potentially faster as it only involves checking a string property.
    * **Cons:** Less reliable as it relies on explicit naming conventions in the HTML and CSS, making it susceptible to inconsistencies or changes in the project's structure.

**Other Considerations:**

* **Context Matters:** The ideal method depends heavily on the specific application and the way elements are styled.  If your styles rely solely on CSS classes for visibility control, `className` might be sufficient. However, if you have complex styling rules involving multiple selectors or inheritance, `getComputedStyle` is more robust. 
* **Alternatives:** Other libraries like  jQuery or Zepto could be used to simplify these checks, but they add an extra dependency and overhead.

**Benchmark Results:**

The provided benchmark results show that the `className` method is significantly faster (almost 5 times) than `getComputedStyle`. This suggests that in this particular scenario, relying on class names for visibility control is a more efficient approach. However, remember that benchmarks are specific to the context and setup used. In a different scenario with different styles or HTML structures, the results might vary.

Let me know if you'd like me to elaborate on any aspect of this explanation!

window.getComputedStyle vs. className (version: 0)

Comparing performance of: `getComputedStyle vs className`

Created: 8 years ago by: Guest

Go to the latest result

getComputedStyle

className

Historical Performance Data aggregated from 83 community runs

Desktop Results:

Chrome 72 runs

Firefox 11 runs

Suite status: <idle, ready to run>

Fastest: N/A

Slowest: N/A

Autogenerated LLM Summary (model gemma2:9b, generated one year ago):

window.getComputedStyle vs. className (version: 0)

Comparing performance of: getComputedStyle vs className

Created: 8 years ago by: Guest

Go to the latest result

getComputedStyle

className

Historical Performance Data aggregated from 83 community runs

Desktop Results:

Chrome 72 runs

Firefox 11 runs

Suite status: <idle, ready to run>

Fastest: N/A

Slowest: N/A

Autogenerated LLM Summary (model gemma2:9b, generated one year ago):

Related benchmarks

Comparing performance of: `getComputedStyle vs className`