Benchmark: CloneNode after Append to Fragment vs Append to DOM

HTML Preparation code:

<html>

  <body>
    <div id="js">
    </div>
  </body>

</html>

Script Preparation code:

var container = document.getElementById("js");
var elemContainer = document.createElement("div");
elemContainer.innerText = "test";
container.appendChild(elemContainer);


var fragment = document.createDocumentFragment();
var elemFragment = document.createElement("div");
elemFragment.innerText = "test";
fragment.appendChild(elemFragment);

Tests:

CloneNode from DOM
elemContainer = elemContainer.cloneNode();
CloneNode from Fragment
elemFragment = elemFragment.cloneNode();

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
CloneNode from DOM
CloneNode from Fragment

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 explanation of the provided benchmark.

**Benchmark Definition**

The benchmark measures the performance difference between two approaches:

1. **Applying `cloneNode()` to an element in the DOM**: This involves creating an element, assigning its clone to another variable (`elemContainer`), and then appending the original element to a container (`container.appendChild(elemContainer)`).
2. **Applying `cloneNode()` to an element within a `DocumentFragment`**: This involves creating a fragment, cloning an element within it (`elemFragment.cloneNode()`), and then appending the cloned element to the fragment.

**Options Compared**

The two options being compared are:

* Using `cloneNode()` on an element in the DOM (Option A)
* Using `cloneNode()` on an element within a `DocumentFragment` (Option B)

**Pros and Cons of Each Approach:**

**Option A (Applying `cloneNode()` to an element in the DOM):**

Pros:

* This approach may be more straightforward, as it involves only creating an element, cloning it, and appending it to another element.
* It may be easier for developers familiar with DOM manipulation.

Cons:

* This approach can lead to unnecessary DOM tree mutations (e.g., adding a new node) because the cloned element is not actually added to the DOM immediately. Instead, the original element's clone is stored in `elemContainer`.
* This could potentially cause issues with event listeners or other properties attached to the original element.

**Option B (Applying `cloneNode()` to an element within a `DocumentFragment`):**

Pros:

* This approach can be more efficient because it avoids creating new DOM nodes unnecessarily. The cloned element is stored in `elemFragment`, and only when needed is it appended to another element.
* It may reduce the number of mutations on the DOM tree.

Cons:

* This approach requires using a `DocumentFragment` and understanding its role in DOM manipulation.
* It might be less straightforward for developers unfamiliar with this technique.

**Library Usage**

The benchmark uses the following libraries:

* None explicitly mentioned, but it's implied that `document` is used to interact with the DOM.

**Special JS Features or Syntax**

None are mentioned. However, it's worth noting that using `DocumentFragment` and `cloneNode()` can be considered advanced JavaScript techniques.

**Other Alternatives**

If you're interested in exploring alternative approaches, here are a few:

* **Use `Element.prototype.slice()`**: Instead of `cloneNode()`, some browsers (like Firefox) provide an `slice()` method that can create a shallow clone of an element. This might be faster than `cloneNode()`.
* **Use a library like `jsdom`**: These libraries allow you to work with the DOM in a more controlled environment, which can simplify benchmarking and make it easier to explore different approaches.
* **Write a custom cloning function**: Depending on your specific use case, you might be able to write an optimized cloning function that takes into account the specifics of your use case.

Keep in mind that each alternative approach may have its own trade-offs and considerations. It's essential to test and evaluate each option to determine which one best suits your needs.

Related benchmarks:

CloneNode after Append to Fragment vs Append to DOM (version: 0)

Comparing performance of: CloneNode from DOM vs CloneNode from Fragment

Created: 4 years ago by: Registered User

Jump to the latest result

CloneNode from DOM

CloneNode from Fragment

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):