Benchmark: JQuery - CSS vs offset

HTML Preparation code:

<p id="image">IMAGE</p>
<script src='https://cdnjs.cloudflare.com/ajax/libs/jquery/3.3.1/jquery.js'></script>

Tests:

css()
$("#image").css({top: '10px', left: '30px'});
height()
$("#image").offset({top: 10, left: 30});

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
css()
height()

Fastest: N/A

Slowest: N/A

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

LLMs can make mistakes. Check important info.

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

**Benchmark Definition Json:**

The JSON represents a JavaScript microbenchmark created using MeasureThat.net. It defines a benchmark with the name "JQuery - CSS vs offset". The description field is empty, which means no additional context or explanation for this benchmark.

The script preparation code is also empty, indicating that no custom initialization or setup code is required before running the tests.

However, an HTML preparation code is provided, which includes a paragraph element with an ID of "image" and a link to jQuery library. This suggests that the benchmark will be testing the performance difference between using `css()` and `offset()` methods in jQuery for setting the position of the paragraph element.

**Individual Test Cases:**

The benchmark defines two test cases:

1. **Test Case 1:** `$("("#image").css({top: '10px', left: '30px'});")`

This test case is comparing the performance of setting the CSS styles directly on an HTML element using the `css()` method.

2. **Test Case 2:** `$("("#image").offset({top: 10, left: 30});")`

This test case is comparing the performance of setting the offset position of an HTML element using the `offset()` method.

**Pros and Cons of Different Approaches:**

- **CSS vs Offset Approach:**
  - Pros:
    * More intuitive and readable code.
    * May be faster since it doesn't require traversing DOM elements to find the target node.
  - Cons:
    * Can lead to slower performance if used excessively, as it needs to parse CSS rules which can take more time.
    * Can also lead to issues when dealing with complex CSS selectors or dynamic stylesheets.

- **Offset Approach:**
  - Pros:
    * Faster since it directly manipulates the DOM element's position without needing CSS parsing.
    - More suitable for setting absolute positions, as it returns the offset from the top-left corner of the nearest positioned ancestor element.
  - Cons:
    * Less intuitive and less readable code compared to `css()` method.

**Library:**

The provided HTML preparation code includes a jQuery library. The purpose of this library is to simplify DOM manipulation by providing an easy-to-use API for interacting with elements in the document. In this benchmark, it's used to test performance differences between using `css()` and `offset()` methods.

**Special JS Feature or Syntax:**

There are no special JavaScript features or syntax mentioned in the provided code snippet that would affect its execution or understanding.

**Other Alternatives:**

If you were to rewrite this benchmark for performance comparison without jQuery, you could consider testing different approaches using native JavaScript methods like `getComputedStyle()` and CSSOM (CSS Object Model) API. However, keep in mind that these approaches can be less readable and less intuitive than using jQuery's DOM manipulation methods.

Here is a sample benchmark structure with alternative test cases:

```json
"{
    "Name": "Native JS - CSS vs offset",
    "Description": null,
    "Script Preparation Code": null,
    "Html Preparation Code": "<p id=\"image\">IMAGE</p>\r\n"
}
```

Test Cases:

1. `getComputedStyle()`
2. `CSSOM API`

Latest run results:

Run details: (Test run date: 4 years ago)

User agent: Mozilla/5.0 (X11; Linux x86_64; rv:68.0) Gecko/20100101 Firefox/68.0

Browser/OS: Firefox 68 on Linux

View result in a separate tab

Test name	Executions per second
css()	269889.6 Ops/sec
height()	56987.8 Ops/sec

Related benchmarks:

JQuery - CSS vs offset (version: 0)

Comparing performance of: css() vs height()

Created: 4 years ago by: Guest

Jump to the latest result

css()

height()

Suite status: <idle, ready to run>

Experimental features:

Fastest: N/A

Slowest: N/A

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