Benchmark: change HTML: DOMParser vs regex 2

Tests:

domparser
const html = 'Test Foto'; const parser = new DOMParser(); const virtualDom = parser.parseFromString(html, 'text/html'); const el = virtualDom.querySelector('p') el.style['text-align']='left'; const result = new XMLSerializer().serializeToString(virtualDom);
regex
const html = 'Test Foto'; const regex = /text-align[\s]*:[\d\w\s]*/gm; const r = html.replace(regex, '');

Historical Performance Data aggregated from 7 community runs

Desktop Results:

Chrome 7 runs

regex

13.5M/s

domparser

35K/s

Fastest: regex (388.8x faster)

View exact numbers

✓ regex: 13,495,417 ops/sec
• domparser: 34,708 ops/sec

Results show median performance across all community submissions. Run this benchmark yourself to verify on your device.

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
domparser
regex

Fastest: N/A

Slowest: N/A

Latest run results:

Run details: (Test run date: 9 months ago)

User agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/142.0.0.0 Safari/537.36 Edg/142.0.0.0

Browser/OS: Chrome 142 on Windows

View result in a separate tab

regex

13.5M/s

domparser

35K/s

View exact numbers

Test name	Executions per second
✓ regex	13,529,966 Ops/sec
domparser	34,564 Ops/sec

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

LLMs can make mistakes. Check important info.

**Overview of the Benchmark**

The provided JSON represents two individual test cases for measuring the performance of JavaScript microbenchmarks on MeasureThat.net. The benchmark is designed to compare the performance of using `DOMParser` and regular expressions (`regex`) to manipulate HTML strings.

**Test Case 1: DOMParser vs regex (change HTML)**

In this test case, a sample HTML string with inline styles is used as input. The goal is to extract or modify the HTML content.

The benchmark defines two approaches:

1. **DOMParser**: Creates a `DOMParser` object and uses its `parseFromString()` method to parse the HTML string into a virtual DOM document. Then, it selects an element (``) using `querySelector()` and applies a new style attribute value to it using the `style` property.
2. **regex**: Uses regular expressions to extract or modify the HTML content. In this case, the regex pattern `/text-align[\\s]*:[\\d\\w\\s]*/gm` is used to remove the `text-align: center;` style attribute from the `` element.

**Pros and Cons of Each Approach**

* **DOMParser**:
	+ Pros:
		- Can be more efficient for manipulating complex HTML structures.
		- Provides a more accurate representation of the original HTML document.
	+ Cons:
		- May have higher overhead due to the parsing process.
		- Not suitable for very large or complex HTML documents.
* **regex**:
	+ Pros:
		- Lightweight and efficient, as it only requires string manipulation.
		- Can be used for more complex patterns and regular expression operations.
	+ Cons:
		- May have higher overhead due to the regex engine's complexity.
		- Not suitable for very large or complex HTML documents.

**Library: XMLSerializer**

In both test cases, the `XMLSerializer` object is used to serialize the virtual DOM document into a string. The `XMLSerializer` object is part of the JavaScript API and provides a way to convert XML documents into a string representation.

**Other Alternatives**

Other alternatives for manipulating HTML strings could include:

* Using a library like jQuery or Prototype, which provide more advanced manipulation capabilities.
* Utilizing HTML parsing libraries like Cheerio or jsdom, which offer faster and more efficient DOM manipulation.
* Employing CSS-in-JS solutions, such as styled-components or Emotion, to manage styles in the JavaScript code.

**Special JS Feature/Syntax**

There are no special JavaScript features or syntax used in these test cases. However, it's worth noting that MeasureThat.net may use other features or libraries not explicitly mentioned here.

change HTML: DOMParser vs regex 2 (version: 1) Benchmark.js

Comparing performance of: `domparser vs regex`

Created: 3 years ago by: Registered User

Go to the latest result

domparser

regex

Historical Performance Data aggregated from 7 community runs

Desktop Results:

Chrome 7 runs

Suite status: <idle, ready to run>

Fastest: N/A

Slowest: N/A

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

change HTML: DOMParser vs regex 2 (version: 1) Benchmark.js

Comparing performance of: domparser vs regex

Created: 3 years ago by: Registered User

Go to the latest result

domparser

regex

Historical Performance Data aggregated from 7 community runs

Desktop Results:

Chrome 7 runs

Suite status: <idle, ready to run>

Fastest: N/A

Slowest: N/A

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

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Comparing performance of: `domparser vs regex`