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window.getComputedStyle vs. getBoundingClientRect for height
(version: 0)
Comparing performance of:
getComputedStyle vs getBoundingClientRect
Created:
3 years ago
by:
Guest
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HTML Preparation code:
<div id="foo"></div>
Tests:
getComputedStyle
var i = 5000; const node = document.getElementById('foo') while (i--) { checkDisplay('foo'); } function checkDisplay(id) { return parseFloat(window.getComputedStyle(node).height) > 0; }
getBoundingClientRect
var i = 5000; const node = document.getElementById('foo') while (i--) { checkDisplay('foo'); } function checkDisplay(id) { return node.getBoundingClientRect().height > 0; }
Rendered benchmark preparation results:
Suite status:
<idle, ready to run>
Run tests (2)
Previous results
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Test case name
Result
getComputedStyle
getBoundingClientRect
Fastest:
N/A
Slowest:
N/A
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Autogenerated LLM Summary
(model
llama3.2:3b
, generated one year ago):
Let's break down the provided benchmark and explain what is being tested. **Benchmark Definition** The benchmark measures the performance of two methods to retrieve the height of an HTML element: `window.getComputedStyle` and `node.getBoundingClientRect`. Both methods are used to get the height of an element, but they have different approaches and characteristics. **Options Compared** The benchmark compares two options: 1. **`window.getComputedStyle`**: This method retrieves the computed style properties of an element, including its height. It returns a CSSStyleDeclaration object that contains all the styles applied to the element. 2. **`node.getBoundingClientRect`**: This method returns a rectangle object that represents the size and position of an element in the DOM tree. The `height` property of this rectangle is used to retrieve the element's height. **Pros and Cons** * **`window.getComputedStyle`**: + Pros: It provides more detailed information about the element's styles, which can be useful for layout calculations or validation. + Cons: It can be slower than `getBoundingClientRect` because it needs to fetch additional data from the browser's style cache. * **`node.getBoundingClientRect`**: + Pros: It is generally faster and more lightweight than `getComputedStyle`, as it only retrieves the element's size and position. + Cons: It does not provide detailed information about the styles, which can limit its usefulness for certain use cases. **Library and Purpose** In this benchmark, the `checkDisplay` function uses two libraries: 1. **`window.getComputedStyle`**: This method is part of the W3C's CSSOM (CSS Object Model) specification, which provides a standardized API for working with styles in web pages. 2. **`node.getBoundingClientRect`**: This method is also part of the DOM (Document Object Model) specification, which defines how elements are represented and manipulated in HTML documents. **Special JS Features or Syntax** There is no special JavaScript feature or syntax used in this benchmark beyond what's standard for modern browsers. **Other Alternatives** In addition to `window.getComputedStyle` and `node.getBoundingClientRect`, other methods can be used to retrieve an element's height, such as: * **`element.offsetHeight`**: This method returns the element's offset height (the height of its content area), excluding any borders or padding. * **`element.outerHeight`**: This method returns the element's outer height (including all borders and padding). * **`element.style.height`**: This method returns the element's inline style property for the `height` attribute, which can be used to set the element's height programmatically. Keep in mind that these alternatives may have different performance characteristics and use cases compared to `window.getComputedStyle` and `node.getBoundingClientRect`.
Related benchmarks:
clientHeight vs getComputedStyle().height
clientHeight vs getComputedStyle().height no parse float
Get precise height : getComputedStyle vs getBoundingClientRect vs innerHeight
clientHeight + clientWidth vs getComutedStyle()
window.getComputedStyle vs. getBoundingClientRect width
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