Benchmark: JS: append vs appendChild with multiple elements

HTML Preparation code:

<div id="wrapper"></div>

Script Preparation code:

var wrapper = document.getElementById("wrapper");

var div = document.createElement("div");
var paragraph = document.createElement("p");

Tests:

append
wrapper.append(div, paragraph);
appendChild
wrapper.appendChild(div); wrapper.appendChild(paragraph);

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
append
appendChild

Fastest: N/A

Slowest: N/A

Latest run results:

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

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I'd be happy to explain the benchmark in detail.

**What is being tested?**

The provided JSON represents a JavaScript microbenchmark that tests the performance difference between two methods for appending elements to an HTML element: `append` and `appendChild`. The test creates a container element (`div`) with an ID of "wrapper" and two child elements: a `paragraph` and a `div`.

**Options compared**

Two options are being compared:

1. **`append`**: This method appends the specified elements to the end of the current list of child nodes.
2. **`appendChild`**: This method adds the specified element to the end of the current list of child nodes.

**Pros and Cons of each approach:**

* `append`: This method is generally faster because it avoids creating a new DOM node for each append operation. However, it can be less efficient if the elements being appended are large or complex, as it does not allow the browser to optimize their layout.
* `appendChild`: This method creates a new DOM node for each append operation, which can lead to slower performance due to increased overhead. However, it allows the browser to optimize the layout of the elements being appended.

**Other considerations:**

* The test assumes that the HTML element (`wrapper`) is already present in the document, which may not be the case in all scenarios.
* The test does not account for any potential differences in behavior between modern and older browsers.

**Library usage**

The test uses the `document` object, which is a built-in part of the DOM (Document Object Model) API. It provides access to various HTML elements and allows developers to manipulate the document structure.

**Special JS feature or syntax: None**

There are no special JavaScript features or syntax used in this benchmark.

**Other alternatives**

There are alternative methods for appending elements, such as:

* `insertBefore()` method: This method inserts a new node before an existing node.
* Using `DOMParser` to create a new DOM document and append the elements to it, then appending the entire document to the target element.

However, these alternatives may not be supported by older browsers or have different performance characteristics compared to `append` and `appendChild`.

Related benchmarks:

JS: append vs appendChild with multiple elements (version: 0)

Comparing performance of: append vs appendChild

Created: 3 years ago by: Guest

Jump to the latest result

append

appendChild

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):