Benchmark: testthis - MeasureThat.net

HTML Preparation code:

<script src='https://cdnjs.cloudflare.com/ajax/libs/jquery/3.3.1/jquery.js'></script>

<div id="box" style="background:#555;color:#FFF;position:absolute;left:0;top:0;width:400px;height:100px;</div>

Tests:

a
var elem = document.getElementById('box'); elem.style.cssText +=';width:300px;height:50px;';
c
var elem = document.getElementById('box'); elem.style.width = '300px'; elem.style.height = '50px'; elem.style.top = '40px'; elem.style.left = '90px';

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
a
c

Fastest: N/A

Slowest: N/A

Latest run results:

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

LLMs can make mistakes. Check important info.

Let's dive into the world of JavaScript microbenchmarks on MeasureThat.net.

**What is being tested?**

The provided JSON represents a benchmark test case that measures the performance difference between two approaches for setting CSS styles on an HTML element using jQuery.

**Options compared:**

There are two options compared in this benchmark:

1. **Option A:** `elem.style.cssText += 'width:300px;height:50px;';`
2. **Option C:** `var elem = document.getElementById('box');\r\nelem.style.width = '300px';\r\nelem.style.height = '50px';\r\nelem.style.top = '40px';\r\nelem.style.left = '90px';`

**Pros and cons of each approach:**

1. **Option A (CSS `style` property with concatenation)**:
	* Pros:
		+ More concise and readable.
		+ No need to declare separate variables for each style attribute.
	* Cons:
		+ May lead to slower performance due to the overhead of string concatenation.
		+ Can result in less optimal CSS code generation (e.g., unnecessary semicolons).
2. **Option C (Direct assignment of style properties)**:
	* Pros:
		+ Directly sets each property value, potentially resulting in more efficient execution.
	* Cons:
		+ Requires declaring separate variables for each style attribute, making the code slightly less concise.

**Other considerations:**

* The use of jQuery in this benchmark simplifies the test and makes it easier to compare the two options. However, this also means that any performance differences are primarily due to the JavaScript engine's optimization of the `style` property vs. direct assignment.
* The specific styles being set (`width`, `height`, `top`, and `left`) may impact performance, as certain style properties can have varying degrees of optimization in different browsers.

**Library usage:**

In this benchmark, jQuery is used to simplify the test by allowing us to target an HTML element with a specific ID. The library's presence does not directly affect the comparison between the two options but rather provides a convenient way to execute the tests.

**Special JavaScript feature or syntax:**

There are no special features or syntaxes being tested in this benchmark beyond the use of jQuery, which is a standard library for simplifying DOM interactions.

**Alternatives:**

Other alternatives for setting CSS styles on an HTML element might include:

* Using the `style` attribute directly (e.g., `elem.style = 'width:300px;height:50px;top:40px;left:90px';`)
* Creating a separate style object and applying it to the element using `elem.style.cssText`
* Using a CSS-in-JS library like Emotion or Styled Components

Keep in mind that these alternatives might have different performance characteristics, and their use would depend on the specific requirements of your project.

Related benchmarks:

testthis (version: 0)

Comparing performance of: a vs c

Created: 5 years ago by: Guest

Jump to the latest result

a

c

Suite status: <idle, ready to run>

Fastest: N/A

Slowest: N/A

No previous run results

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