Benchmark: insertAdjacentHTML + querySelector vs append

HTML Preparation code:

<div id="test"></div>

Tests:

append
var newElement = document.createElement("div"); newElement.id = "testing" for (i = 0; i < 1000; i++) { var newElementPart = document.createElement("div"); newElementPart.classList.add("testClass"); newElement.append(newElementPart); } document.getElementById("test").append(newElement);
insertAdjacentHTML
html = "<div id='testing'>" for (i = 0; i < 1000; i++) { html += "<div class='testClass'></div>"; } html += "</div>"; test = document.getElementById("test") test.insertAdjacentHTML("beforeend", html); test.querySelector('.testClass')

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
append
insertAdjacentHTML

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'll break down the provided JSON and explain what's being tested, compared options, pros and cons of those approaches, and other considerations.

**Benchmark Definition**

The benchmark is designed to compare the performance of two methods:

1. `insertAdjacentHTML`: This method inserts HTML content into an element without modifying the DOM.
2. `append`: This method appends a child node to an existing element in the DOM.

**Options Compared**

The options being compared are:

* Using `insertAdjacentHTML` with `beforeend` as its argument, which will insert the HTML at the end of the element's content.
* Using `append` to append a child node to the element.

**Pros and Cons**

1. **InsertAdjacentHTML**
	* Pros:
		+ More efficient than appending a child node using `append`, especially for large amounts of data.
		+ Does not modify the DOM, making it more suitable for applications that require minimal DOM manipulation.
	* Cons:
		+ Requires two operations (inserting HTML and setting the position), which may be slower than a single operation with `append`.
2. **Append**
	* Pros:
		+ Single operation, which can be faster than multiple operations.
	* Cons:
		+ May modify the DOM unnecessarily, leading to performance issues in certain scenarios.

**Library Used**

There is no specific library used in this benchmark.

**Special JS Features/Syntax**

The benchmark uses the `for` loop and `document.createElement`, `document.getElementById`, `element.insertAdjacentHTML`, and `element.querySelector` methods, which are standard JavaScript features. There are no special features or syntax mentioned.

**Other Considerations**

When choosing between these two approaches, consider the following factors:

* **DOM Manipulation**: If you need to frequently modify the DOM, `insertAdjacentHTML` might be a better choice due to its minimal impact on the DOM.
* **Performance**: For large amounts of data, `insertAdjacentHTML` can be more efficient than appending child nodes using `append`.
* **Code Readability**: Some developers may find `insertAdjacentHTML` less readable or intuitive due to its abstract nature. However, it's a widely adopted and well-supported method in modern web development.

**Alternatives**

If you're looking for alternative approaches, consider the following:

* **Template literals**: Using template literals with `innerHTML` can provide similar performance benefits as `insertAdjacentHTML`.
* **DOM fragment manipulation**: Instead of appending child nodes, you can create a DOM fragment and append it to the element. This approach avoids modifying the DOM unnecessarily.
* **Virtual DOM**: If you're working on a large-scale application or need to optimize rendering performance, consider using a virtual DOM library like React or Vue.js.

Keep in mind that these alternatives may require more code changes and learning curve adjustments compared to `insertAdjacentHTML` and `append`.

Related benchmarks:

insertAdjacentHTML + querySelector vs append (version: 0)

Comparing performance of: append vs insertAdjacentHTML

Created: 3 years ago by: Guest

Jump to the latest result

append

insertAdjacentHTML

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):