Benchmark: data-src complexity

HTML Preparation code:

<div id="wrap">
<div class="hello class2" id="hello2" data-src="weqwesad">Hello</div>	
<div class="hello class3" id="hello3" data-src="wedqwesd">Hello</div>	
<div class="hello class4" id="hello4" data-src="weqwecsd">Hello</div>	
<div class="hello class5" id="hello5" data-src="wexqwesd">Hello</div>	
<div class="hello class6" id="hello6" data-src="weqwvesd">Hello</div>	
<div class="hello class7" id="hello7" data-src="weqwzesd">Hello</div>	
<div class="hello class8" id="hello8" data-src="wevqwesd">Hello</div>	
<div class="hello class9" id="hello9" data-src="weqwbesd">Hello</div>
<div class="hello class10" id="hello10" data-src="weqcwesd">Hello</div>		
<div class="hello class11" id="hello11" data-src="weqzwesd">Hello</div>	
<div class="hello class12" id="hello12" data-src="weqswesd">Hello</div>	
<div class="hello class13" id="hello13" data-src="wgeqwesd">Hello</div>	
<div class="hello class14" id="hello14" data-src="weqwhesd">Hello</div>	
<div class="hello class15" id="hello15" data-src="weqwvesd">Hello</div>
</div>

Tests:

data attribute plain
document.getElementById('wrap').querySelector('[data-src]');
data attribute div
document.getElementById('wrap').querySelector('div[data-src]');

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
data attribute plain
data attribute div

Fastest: N/A

Slowest: N/A

Latest run results:

No previous run results

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

LLMs can make mistakes. Check important info.

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**Benchmark Definition and Script Preparation Code**

The provided JSON represents a benchmark definition for measuring the performance of querying elements with a `data-src` attribute. The script preparation code is empty, which means that no additional setup or initialization is required before running the benchmark.

**Test Cases**

There are two individual test cases:

1. **"data attribute plain"`**: This test case queries elements using the `document.getElementById('wrap').querySelector('[data-src]')` method.
2. **"data attribute div"`**: This test case queries elements using the `document.getElementById('wrap').querySelector('div[data-src]')` method.

**Comparison of Options**

In both test cases, the same HTML structure is used to create multiple elements with different `data-src` attributes. The difference lies in how these elements are queried:

* **"data attribute plain"`**: Uses a single attribute (`data-src`) and queries all elements that have this attribute using `[data-src]`.
* **"data attribute div"`**: Uses a more specific selector (`div[data-src]`) to query only the `div` elements with the `data-src` attribute.

**Pros and Cons**

Here's a brief analysis of each approach:

* **"data attribute plain"`**:
	+ Pros: Simple and easy to understand. Querier is not bound by any specific tag.
	+ Cons: May be slower due to the need to iterate over all elements with the `data-src` attribute, which could lead to a higher number of DOM queries.
* **"data attribute div"`**:
	+ Pros: More efficient because it only targets `div` elements, reducing the number of DOM queries.
	+ Cons: Requires more specific knowledge of CSS selectors and may be harder to understand for less experienced developers.

**Libraries and Special JS Features**

Neither of the test cases uses any external libraries or special JavaScript features. The focus is on measuring the performance of the built-in `querySelector` method in different scenarios.

**Other Alternatives**

If you were to modify these test cases, here are some alternative approaches you could consider:

* Use a more specific selector (e.g., `[data-src^="we"]`) to further optimize queries.
* Add more elements with varying `data-src` attributes to increase the sample size and improve accuracy.
* Consider using different HTML structures or tag names to test the performance of other query methods (e.g., `querySelectorAll`, `getElementsByAttribute`).

These alternatives would require changes to the script preparation code and individual test cases, but could provide valuable insights into the performance characteristics of different querying techniques.

Related benchmarks:

data-src complexity (version: 0)

Comparing performance of: data attribute plain vs data attribute div

Created: 5 years ago by: Guest

Jump to the latest result

data attribute plain

data attribute div

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):