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scroll distance vs el top
(version: 0)
Comparing performance of:
scrolled vs el top
Created:
8 years ago
by:
Guest
Jump to the latest result
HTML Preparation code:
<div class="el"></div>
Script Preparation code:
var el = document.querySelector('.el');
Tests:
scrolled
var scrolled = window.pageYOffset;
el top
var elTop = el.getBoundingClientRect().top;
Rendered benchmark preparation results:
Suite status:
<idle, ready to run>
Run tests (2)
Previous results
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Test case name
Result
scrolled
el top
Fastest:
N/A
Slowest:
N/A
Latest run results:
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Autogenerated LLM Summary
(model
llama3.2:3b
, generated one year ago):
Let's dive into the explanation of the provided benchmark. **Benchmark Overview** The benchmark measures the performance difference between two JavaScript expressions: `window.pageYOffset` (scrolled) and `.getBoundingClientRect().top` (el top). The purpose of this benchmark is to compare the execution speed of these two methods in different browsers and environments. **Options Compared** Two options are compared: 1. **window.pageYOffset**: This method returns the current vertical scroll position of the window or document. 2. **.getBoundingClientRect().top**: This method returns the top position of an element relative to the viewport (or its nearest positioned ancestor). **Pros and Cons of Each Approach** 1. `window.pageYOffset`: * Pros: Simple, lightweight, and widely supported across browsers. * Cons: May not provide accurate results if the window or document has been scrolled but is currently at the top position. 2. `.getBoundingClientRect().top`: * Pros: Provides more accurate results by considering the element's position relative to the viewport. * Cons: More computationally expensive, especially for large elements or complex layouts. **Library and Purpose** In this benchmark, no libraries are explicitly mentioned, but `.getBoundingClientRect()` is a W3C standard method that has been widely adopted across browsers. Its purpose is to provide an accurate representation of an element's position relative to the viewport. **Special JavaScript Features/Syntax** None of the provided expressions use any special JavaScript features or syntax. They are simple arithmetic operations and property accesses. **Alternative Approaches** Other alternatives for comparing these two methods might include: * Using a timing library like `microtime()` (not shown in this benchmark) to measure execution time. * Measuring the number of iterations required to reach a certain target value using loops or recursive functions. * Comparing the memory usage or allocation patterns of each method. Keep in mind that these alternatives may not provide the same level of accuracy or relevance as measuring execution speed directly.
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