Benchmark: html createElement vs dom parser

HTML Preparation code:

<html>
  <head>
  </head>
  <body>
    <main class="main">
    </main>
  </body>
</html>

Tests:

dom parser
const parser = new DOMParser(); const doc = parser.parseFromString(`<html> <head> </head> <body> <main class="main"> <h1>moo</h1> </main> </body> </html>`, 'text/html'); const newMain = doc.querySelector('.main'); document.querySelector('.main').replaceWith(newMain);
createElement
const doc = document.createElement('html'); doc.innerHTML = `<html> <head> </head> <body> <main class="main"> <h1>moo</h1> </main> </body> </html>`; const newMain = doc.querySelector('.main'); document.querySelector('.main').replaceWith(newMain);

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
dom parser
createElement

Fastest: N/A

Slowest: N/A

Latest run results:

Run details: (Test run date: one year ago)

User agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/124.0.0.0 Safari/537.36

Browser/OS: Chrome 124 on Mac OS X 10.15.7

View result in a separate tab

Test name	Executions per second
dom parser	17262.0 Ops/sec
createElement	9047.5 Ops/sec

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.

**What is being tested?**

The benchmark measures the performance difference between two approaches:

1. Using `DOMParser` to parse an HTML string and then manipulating its elements using `querySelector` and `replaceWith`.
2. Creating a new `HTMLDocument` element, setting its inner HTML content, and then manipulating its elements using `querySelector` and `replaceWith`.

**Options compared:**

The benchmark compares the performance of these two approaches:

* `DOMParser`
	+ Pros:
		- More explicit and controlled way to parse HTML strings.
		- Allows for more fine-grained manipulation of the parsed document.
	+ Cons:
		- May be slower due to the parsing overhead.
* `createElement` ( Creating a new HTML element and setting its inner HTML content)
	+ Pros:
		- Faster since it avoids the parsing overhead.
		- More lightweight, as only a single DOM node is created.
	+ Cons:
		- Less controlled and less explicit than using `DOMParser`.
		- May not provide fine-grained control over the parsed document.

**Other considerations:**

* The benchmark uses the latest version of Chrome (124) on a Macintosh platform, which may affect the results. Running the benchmark on different browsers or platforms might yield different results.
* The benchmark measures the number of executions per second, which indicates how many times each approach can execute in one second. This metric is useful for measuring performance but may not be representative of real-world use cases.

**Library and its purpose:**

The `DOMParser` library is a built-in JavaScript API that allows parsing HTML strings into DOM documents. Its primary purpose is to provide a way to convert string representations of HTML into parseable documents, which can then be manipulated using standard DOM methods.

In this benchmark, `DOMParser` is used to parse the provided HTML string and create a new DOM document, from which elements are queried and replaced using `querySelector` and `replaceWith`.

**Special JS feature or syntax:**

There doesn't appear to be any special JavaScript features or syntax being tested in this benchmark. The focus is on comparing the performance of two different approaches to manipulating HTML documents.

**Alternatives:**

Other alternatives for parsing HTML strings or creating new DOM elements include:

* Using a library like Cheerio, which provides a jQuery-like API for parsing and manipulating HTML documents.
* Utilizing a template engine like Handlebars or Mustache, which can render templates with dynamic data into HTML strings.
* Leveraging DOM manipulation libraries like React or Angular, which provide optimized and efficient ways to update the DOM in complex web applications.

In summary, this benchmark compares the performance of two approaches for manipulating HTML documents: using `DOMParser` versus creating a new `HTMLDocument` element. The results can help developers understand the trade-offs between control, speed, and memory usage when working with HTML strings in their JavaScript applications.

Related benchmarks:

html createElement vs dom parser (version: 0)

Comparing performance of: dom parser vs createElement

Created: one year ago by: Guest

Jump to the latest result

dom parser

createElement

Suite status: <idle, ready to run>

Fastest: N/A

Slowest: N/A

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