Benchmark: testLS - MeasureThat.net

HTML Preparation code:

<ul>
  <li class="list">1</li>
  <li class="list">2</li>
  <li class="list">3</li>
  <li class="list">4</li>
  <li class="list">5</li>
  <li class="list">6</li>
  <li class="list">7</li>
  <li class="list">8</li>
  <li class="list">9</li>
  <li class="list">10</li>
  <li class="list">11</li>
  <li class="list">12</li>
  <li class="list">13</li>
  <li class="list">14</li>
  <li class="list">15</li>
  <li class="list">16</li>
  <li class="list">17</li>
  <li class="list">18</li>
  <li class="list">19</li>
  <li class="list">20</li>
</ul>

Tests:

querySelectorAll TAG
document.querySelectorAll("li");
getElementsByClassName
document.getElementsByClassName("list");
getElementsByTagName
document.getElementsByTagName("li")
querySelectorAll CLASS
document.querySelectorAll(".list");

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
querySelectorAll TAG
getElementsByClassName
getElementsByTagName
querySelectorAll CLASS

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.

**What is tested on the provided JSON?**

The provided JSON represents a set of JavaScript microbenchmarks for testing the performance of different DOM querying methods in various browsers and devices.

**Options compared:**

There are four individual test cases:

1. `querySelectorAll TAG`: Tests the performance of `document.querySelectorAll("li")`, which returns all elements with the tag name "li".
2. `getElementsByClassName`: Tests the performance of `document.getElementsByClassName("list")`, which returns all elements with the class name "list".
3. `getElementsByTagName`: Tests the performance of `document.getElementsByTagName("li")`, which returns a live HTMLCollection of all elements with the tag name "li".
4. `querySelectorAll CLASS`: Tests the performance of `document.querySelectorAll(".list")`, which returns all elements with the class name "list".

**Pros and Cons of each approach:**

1. **`querySelectorAll TAG`**:
	* Pros: Fast and efficient, as it uses a tag name to identify elements.
	* Cons: May not work in older browsers that don't support this method.
2. **`getElementsByClassName`**:
	* Pros: Works across different browsers, including older ones.
	* Cons: Can be slower than `querySelectorAll TAG` due to the need to parse class names.
3. **`getElementsByTagName`**:
	* Pros: Fast and efficient, as it uses a tag name to identify elements.
	* Cons: Returns a live HTMLCollection, which can be less efficient for large datasets.
4. **`querySelectorAll CLASS`**:
	* Pros: Flexible and works with CSS selectors, making it easier to target specific elements.
	* Cons: May be slower than other methods due to the need to parse class names.

**Libraries used:**

None of the test cases use any external libraries beyond the built-in JavaScript DOM API.

**Special JS features or syntax:**

The `querySelectorAll CLASS` method uses a CSS selector (`.list`) to identify elements, which is a more modern and flexible approach than using a tag name. The `getElementsByClassName` method also uses a CSS selector (`"list"`), but it's not as powerful as `querySelectorAll CLASS`.

**Other alternatives:**

There are other DOM querying methods available in JavaScript, such as:

* `getElementById`: Returns the element with the specified ID.
* `getElementsByAttribute`: Returns all elements that have the specified attribute.
* `getElementsByTagNameNS`: Returns all elements that match a specific namespace.

However, these methods are not compared in this benchmark, and their performance may vary depending on the browser and device being tested.

Related benchmarks:

testLS (version: 0)

testLS

Comparing performance of: querySelectorAll TAG vs getElementsByClassName vs getElementsByTagName vs querySelectorAll CLASS

Created: 3 years ago by: Guest

Jump to the latest result

querySelectorAll TAG

getElementsByClassName

getElementsByTagName

querySelectorAll CLASS

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):