Benchmark: Measure text - MeasureThat.net

HTML Preparation code:

<div></div>

Script Preparation code:

var canvas = document.createElement('canvas');
var context = canvas.getContext('2d', { alpha: false });
context.font = 'bold 48px serif';

var offscreenCanvas = new OffscreenCanvas(0, 0);
var offscreenContext = offscreenCanvas.getContext('2d', { alpha: false });
offscreenContext.font = 'bold 48px serif';

var div = document.querySelector('div')

Tests:

Canvas
context.measureText("TESTM").width
OffscreenCanvas
offscreenContext.measureText("TESTM").width
offsetWidth
div.textContent = "TESTM" div.offsetWidth
getBoundingClientRect
div.textContent = "TESTM" div.getBoundingClientRect().width

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
Canvas
OffscreenCanvas
offsetWidth
getBoundingClientRect

Fastest: N/A

Slowest: N/A

Autogenerated LLM Summary (model llama3.2:3b, generated 27 days ago):

LLMs can make mistakes. Check important info.

Let's break down the provided benchmark and its test cases.

**Overview**
MeasureThat.net is a website that allows users to create and run JavaScript microbenchmarks. The provided benchmark measures the performance of different ways to measure text width using various DOM elements.

**Benchmark Definition JSON**

The benchmark definition JSON contains the following information:

* `Name` and `Description`: These are metadata fields with default values.
* `Script Preparation Code`: This code sets up a canvas element, creates an offscreen canvas context, and sets font styles for both contexts. It also retrieves a `div` element from the DOM.
* `Html Preparation Code`: This code contains only a basic HTML structure with a single `div` element.

**Individual Test Cases**

There are four test cases:

1. **Canvas**: Measures the text width of an element using the `context.measureText()` method on the canvas context.
2. **OffscreenCanvas**: Measures the text width of an element using the `offscreenContext.measureText()` method on the offscreen canvas context.
3. **offsetWidth**: Measures the text width of an element by setting its content to a specific string and measuring the resulting offset width.
4. **getBoundingClientRect**: Meases the text width of an element by setting its content to a specific string, getting the bounding rectangle, and extracting the width from it.

**Options Compared**

The benchmark compares four different approaches to measure text width:

* `context.measureText()` on canvas
* `offscreenContext.measureText()` on offscreen canvas
* `offsetWidth` of a DOM element
* `getBoundingClientRect().width` of a DOM element

**Pros and Cons of Each Approach**

1. **Canvas**: Fastest approach, but requires additional JavaScript setup (script preparation code) and resources (canvas element).
2. **OffscreenCanvas**: Similar to canvas, but uses less resources (offscreen canvas context). However, it may have slower performance due to the overhead of rendering an offscreen canvas.
3. **offsetWidth**: Fastest approach for DOM elements, as it leverages built-in browser APIs. However, it requires setting the element's content to a specific string, which might be overkill for simple text measurements.
4. **getBoundingClientRect().width**: Similar to `offsetWidth`, but uses the more advanced `getBoundingClientRect()` method, which may be slower due to its additional overhead.

**Library and Purpose**

* No explicit libraries are used in this benchmark.
* The `OffscreenCanvas` API is a built-in JavaScript API for creating offscreen canvases, introduced in ECMAScript 2017 (ES2017).

**Special JS Features or Syntax**

None of the test cases use any special JavaScript features or syntax.

**Other Considerations**

When choosing an approach, consider the following factors:

* Performance: If speed is crucial, `context.measureText()` on canvas might be the best choice. For DOM elements, `offsetWidth` or `getBoundingClientRect().width` might be faster.
* Resource usage: If memory and CPU resources are limited, `offscreenContext.measureText()` on offscreen canvas might be a better option.
* Complexity: If you need to handle more complex layouts or styles, you may want to consider using `getBoundingClientRect()` or setting the element's content explicitly.

In summary, MeasureThat.net provides a simple benchmarking framework for comparing different approaches to measure text width in JavaScript. By understanding the pros and cons of each approach, developers can choose the best method for their specific use case.

Latest run results:

Run details: (Test run date: 3 years ago)

User agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/91.0.4472.114 Safari/537.36

Browser/OS: Chrome 91 on Mac OS X 10.15.7

View result in a separate tab

Test name	Executions per second
Canvas	526424.5 Ops/sec
OffscreenCanvas	490879.7 Ops/sec
offsetWidth	531673.9 Ops/sec
getBoundingClientRect	535685.6 Ops/sec

Related benchmarks:

Measure text (version: 0)

Comparing performance of: Canvas vs OffscreenCanvas vs offsetWidth vs getBoundingClientRect

Created: 3 years ago by: Guest

Jump to the latest result

Canvas

OffscreenCanvas

offsetWidth

getBoundingClientRect

Suite status: <idle, ready to run>

Experimental features:

Fastest: N/A

Slowest: N/A

Autogenerated LLM Summary (model llama3.2:3b, generated 27 days ago):