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CanvasWidthTest
(version: 0)
Comparing performance of:
offsetWidth - Clear vs offsetWidth - No Clear vs canvas
Created:
2 years ago
by:
Guest
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HTML Preparation code:
<div id="testDiv"></div>
Script Preparation code:
const canvas = document.createElement('canvas') window.context = canvas.getContext('2d') window.globalThis.str0 = "Hello0"; window.globalThis.str1 = "Hello1"; window.globalThis.iterations = 100; window.globalThis.d = document.getElementById("testDiv");
Tests:
offsetWidth - Clear
for (let i = 0; i < window.globalThis.iterations; i++){ if(i % 2 == 0){ window.globalThis.d.innerText = window.globalThis.str0; } else { window.globalThis.d.innerText = window.globalThis.str1; } const w = d.offsetWidth; window.globalThis.d.innerText = ""; }
offsetWidth - No Clear
for (let i = 0; i < window.globalThis.iterations; i++){ if(i % 2){ window.globalThis.d.innerText = window.globalThis.str0; } else { window.globalThis.d.innerText = window.globalThis.str1; } const w = window.globalThis.d.offsetWidth; }
canvas
for (let i = 0; i < window.globalThis.iterations; i++){ const s = i % 2 ? window.globalThis.str0 : window.globalThis.str1; const w = window.context.measureText(s).width; }
Rendered benchmark preparation results:
Suite status:
<idle, ready to run>
Run tests (3)
Previous results
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Test case name
Result
offsetWidth - Clear
offsetWidth - No Clear
canvas
Fastest:
N/A
Slowest:
N/A
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Autogenerated LLM Summary
(model
llama3.2:3b
, generated one year ago):
Let's dive into the world of JavaScript microbenchmarks on MeasureThat.net. **Benchmark Definition:** The benchmark definition is a JSON object that contains information about the test case being measured. In this case, we have three individual test cases: 1. **CanvasWidthTest**: This test case creates a new canvas element and sets up a 2D drawing context. It also defines two global variables `str0` and `str1`, and an iterations variable that determines how many times the test is run. The test case uses the canvas to measure the width of a text string. 2. **offsetWidth - Clear**: This test case measures the performance of getting the offsetWidth property of an element after clearing its content. 3. **offsetWidth - No Clear**: This test case measures the performance of getting the offsetWidth property of an element without clearing its content. **Options Compared:** The three test cases compare different approaches to measuring the width of a text string: 1. **CanvasWidthTest**: Measures the width of a text string using the canvas element. 2. **offsetWidth - Clear**: Measures the performance of getting the offsetWidth property after clearing an element's content. 3. **offsetWidth - No Clear**: Measures the performance of getting the offsetWidth property without clearing an element's content. **Pros and Cons:** * **CanvasWidthTest**: + Pros: Provides a more accurate measurement of text width by rendering it on the canvas. + Cons: May require additional resources (e.g., memory, GPU) to render the canvas. * **offsetWidth - Clear**: Pros: Simpler and more lightweight than CanvasWidthTest. Cons: May not provide an accurate measurement if the element's content is updated frequently. * **offsetWidth - No Clear**: Pros: Even simpler and more efficient than offsetWidth - Clear. Cons: May not account for changes in the element's width due to layout calculations. **Other Considerations:** When writing a JavaScript microbenchmark, it's essential to consider factors like: * Memory allocation and deallocation * Garbage collection overhead * Browser-specific optimizations (e.g., Firefox's layout engine) * Environmental factors (e.g., screen resolution, display density) **Library Usage:** The test cases use the following libraries or APIs: * **Canvas API**: Used to create a new canvas element and render text on it. * **JavaScript `offsetWidth` property**: Used to measure the width of an element. **Special JS Features or Syntax:** None mentioned in this benchmark definition. However, JavaScript microbenchmarks often involve special features like: * Async operations * Web Workers * Closure-based optimizations These features can affect the performance of the code and should be carefully considered when writing a microbenchmark. **Alternatives:** Other alternatives for measuring text width or offsetWidth include: * Using an HTML element's innerHTML property (e.g., `element.innerHTML = 'Hello World!';`) * Utilizing CSS styles (e.g., `font-size` and `width`) to measure the text width * Leveraging browser-specific APIs (e.g., Chrome's `layoutEngine.getBestWidth()`) Keep in mind that each approach has its pros and cons, and choosing the right one depends on the specific use case and requirements.
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