Benchmark: Measure Single Text

HTML Preparation code:

<div>Hello World</div>

Script Preparation code:

const canvas = document.createElement('canvas')
window.context = canvas.getContext('2d')

Tests:

offsetWidth
document.querySelector('div').offsetWidth
getBoundingClientRect
document.querySelector('div').getBoundingClientRect().width
canvas
window.context.measureText('Hello world')

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
offsetWidth
getBoundingClientRect
canvas

Fastest: N/A

Slowest: N/A

Latest run results:

Run details: (Test run date: 5 days ago)

User agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/131.0.0.0 Safari/537.36

Browser/OS: Chrome 131 on Windows

View result in a separate tab

Test name	Executions per second
offsetWidth	1250798.4 Ops/sec
getBoundingClientRect	783696.5 Ops/sec
canvas	1287272.2 Ops/sec

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

LLMs can make mistakes. Check important info.

Let's break down the provided JSON and explain what is being tested, compared, and discussed.

**Benchmark Overview**

The benchmark aims to measure the performance of different methods for obtaining the width of a single string or text element on a webpage. The tests are designed to compare the execution speed and accuracy of three approaches:

1. `offsetWidth`
2. `getBoundingClientRect().width`
3. `window.context.measureText('Hello world')`

**Options Compared**

The benchmark compares the performance of these three methods, which can be summarized as follows:

* **`offsetWidth`**: This method returns the width of an element in pixels, but it may not always provide an accurate result due to various factors like font styles, sizes, and rendering engines.
* **`getBoundingClientRect().width`**: This method uses the browser's built-in `bounding client rectangle` API to get the size of an element. It provides a more accurate result than `offsetWidth`, as it takes into account the element's content and layout.
* **`window.context.measureText('Hello world')`**: This method measures the width of a specific string using the 2D drawing context of the HTML canvas element. It is likely to provide an accurate result, but may require more resources compared to other methods.

**Pros and Cons**

Here's a brief analysis of each approach:

* **`offsetWidth`**:
	+ Pros: Simple and widely supported.
	+ Cons: May not always provide an accurate result due to various factors.
* **`getBoundingClientRect().width`**:
	+ Pros: More accurate than `offsetWidth`, as it takes into account the element's content and layout.
	+ Cons: Requires access to the element's bounding rectangle, which might be more complex for some elements.
* **`window.context.measureText('Hello world')`**:
	+ Pros: Likely to provide an accurate result, but may require more resources compared to other methods.
	+ Cons: Limited by the specific string being measured.

**Library and Special JS Features**

The benchmark uses the following libraries or features:

* None explicitly mentioned in the provided JSON. However, it's likely that the HTML canvas element (`window.context`) is a built-in feature of modern browsers.
* No special JavaScript features are used in this benchmark.

**Other Considerations**

When choosing an approach for measuring text width, consider the following factors:

* **Accuracy**: Choose methods that provide accurate results, especially if you need precise measurements.
* **Resource Efficiency**: Opt for methods that require minimal resources (e.g., CPU cycles, memory) to ensure efficient performance.
* **Browser Support**: Ensure that your chosen method is supported by various browsers and versions.

**Alternative Approaches**

Other approaches for measuring text width might include:

* Using CSS properties like `width` or `letter-spacing`.
* Utilizing libraries like jQuery's `.outerWidth()` or `.innerWidth()`.
* Implementing custom solutions using JavaScript, such as parsing HTML or CSS to extract width-related information.

Keep in mind that the best approach depends on your specific use case and requirements.

Related benchmarks:

Measure Single Text (version: 2)

Using various methods to measure a single string of text.

Comparing performance of: offsetWidth vs getBoundingClientRect vs canvas

Created: 4 years ago by: Registered User

Jump to the latest result

offsetWidth

getBoundingClientRect

canvas

Suite status: <idle, ready to run>

Experimental features:

Fastest: N/A

Slowest: N/A

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