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offsetTop pref
(version: 0)
Comparing performance of:
getBoundingClientRect vs offsetTop
Created:
4 years ago
by:
Guest
Go to the latest result
HTML Preparation code:
<div id="el"> <h2>Lorem ipsum dolor sit amet</h2> </div>
Script Preparation code:
var el = document.getElementById("el");
Tests:
getBoundingClientRect
el.getBoundingClientRect()
offsetTop
el.offsetTop
Rendered benchmark preparation results:
Suite status:
<idle, ready to run>
Run tests (2)
Previous results
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Test case name
Result
getBoundingClientRect
offsetTop
Fastest:
N/A
Slowest:
N/A
Latest run results:
Run details:
(Test run date:
one year ago
)
User agent:
Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/133.0.0.0 Safari/537.36 Edg/133.0.0.0
Browser/OS:
Chrome 133 on Windows
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Embed Benchmark Result
<iframe src="https://measurethat.net/Embed?id=591143" width="100%" height="500px"></iframe>
getBoundingClientRect
1.3M/s
offsetTop
889K/s
View exact numbers
Test name
Executions per second
✓
getBoundingClientRect
1,312,983 Ops/sec
offsetTop
889,148 Ops/sec
Autogenerated LLM Summary
(model
llama3.2:3b
, generated one year ago):
I'll break down the provided JSON data and explain what's being tested, compared, and other considerations. **Benchmark Definition** The benchmark definition is represented by two main sections: 1. **Script Preparation Code**: This code is used to prepare the JavaScript script that will be executed during the benchmark. In this case, it retrieves an HTML element using `document.getElementById("el")`. The variable `el` refers to the retrieved element. 2. **Html Preparation Code**: This code is used to create the HTML structure that will be used as input for the benchmark. In this case, a simple `<div>` element with an ID of "el" is created. **Test Cases** The test cases are defined in the following JSON array: ```json [ { "Benchmark Definition": "el.getBoundingClientRect()", "Test Name": "getBoundingClientRect" }, { "Benchmark Definition": "el.offsetTop", "Test Name": "offsetTop" } ] ``` Here, we have two test cases: 1. `getBoundingClientRect`: This test case measures the performance of calling `el.getBoundingClientRect()` on the retrieved element. 2. `offsetTop`: This test case measures the performance of accessing the `offsetTop` property directly on the retrieved element. **Comparison** The comparison being made here is between calling `getBoundingClientRect()` and directly accessing the `offsetTop` property. Both approaches have different pros and cons: * **Calling `getBoundingClientRect()```**: This approach: + Provides more context about the element's position (x, y, width, height) in a single call. + Can be useful for layout-related calculations or when you need to consider multiple dimensions of an element. However, it may incur additional overhead due to the need to create and populate a bounding box structure. * **Directly accessing `offsetTop```**: This approach: + Is typically faster since it only requires accessing a single property value. + Does not provide as much context about the element's position compared to calling `getBoundingClientRect()`. However, it may require more calls if you need to access multiple properties (e.g., `offsetLeft`, `offsetWidth`, etc.). **Library** None of the test cases use any external libraries. The tests are self-contained and only rely on standard JavaScript DOM APIs. **Special JS Features/Syntax** There are no special JavaScript features or syntax used in these test cases. They only use standard JavaScript and DOM APIs. **Other Alternatives** If you need to compare different approaches to accessing element positions, some other alternatives could include: * Using `getBoundingClientRect()` with the `client` option set to `false`, which returns a bounding box that does not include layout margins. * Using `getBoundingClientRect()` with the `layoutMode` option set to `1`, which returns a bounding box that includes layout margins. * Using a library like Lodash or Moment.js to create and manipulate bounding boxes. Keep in mind that the choice of approach depends on your specific use case, performance requirements, and personal preference.
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