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document.head vs document.getElementsByTagName
(version: 0)
Benchmark.js
Comparing performance of:
2 vs 3
Created:
8 years ago
by:
Guest
Go to the latest result
HTML Preparation code:
<html> <head id="myHead"> <title>My title</title> </head> <body><p id="demo"></p> </body> </html>
Tests:
2
var css = document.head;
3
var css = document.getElementsByTagName("head")[0];
Rendered benchmark preparation results:
Suite status:
<idle, ready to run>
Run tests (2)
Previous results
Fork
Test case name
Result
2
3
Fastest:
N/A
Slowest:
N/A
Latest run results:
Run details:
(Test run date:
2 years ago
)
User agent:
Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/109.0.0.0 Safari/537.36
Browser/OS:
Chrome 109 on Windows
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Embed Benchmark Result
<iframe src="https://measurethat.net/Embed?id=512655" width="100%" height="500px"></iframe>
2
4.7M/s
3
3.4M/s
View exact numbers
Test name
Executions per second
✓
2
4,692,277 Ops/sec
3
3,381,999 Ops/sec
Autogenerated LLM Summary
(model
llama3.2:3b
, generated one year ago):
Let's break down what's being tested in this benchmark and explore the options compared, pros and cons, and other considerations. **What is being tested?** The benchmark is testing two ways to access the `<head>` element of an HTML document: using `document.head` versus `document.getElementsByTagName("head")[0]`. **Options compared:** There are two options: 1. **`document.head`**: This method returns a direct reference to the `<head>` element, which can be accessed directly. 2. **`document.getElementsByTagName("head")[0]`**: This method returns an array of all elements with the tag name "head" and returns the first element in the array. **Pros and Cons:** 1. `document.head`: * Pros: Direct access to the `<head>` element, potentially faster since it doesn't require searching for the element. * Cons: May not be available in older browsers that don't support HTML5, and may cause issues if the document has multiple `<head>` elements. 2. `document.getElementsByTagName("head")[0]`: * Pros: Widely supported across browsers, even older ones. Can handle cases where there are multiple `<head>` elements. * Cons: May be slower since it requires searching for the element in an array. **Other considerations:** * **Library usage:** None of the options use a library specifically designed for benchmarking or performance comparison. * **JavaScript features/syntax:** The benchmark uses basic JavaScript syntax and doesn't include any advanced features like async/await, generators, or decorators. **Benchmark preparation code:** The HTML preparation code creates an HTML document with a `<head>` element that contains a title. The script preparation code is empty, which means the test scripts will only contain the lines of code being compared. **Other alternatives:** If you're interested in benchmarking other JavaScript-related scenarios, here are some alternative approaches: * **Bench.js**: A popular benchmarking library for Node.js and browsers. * **Benchmarkist**: A simple and efficient benchmarking tool for JavaScript applications. * **V8 benchmarking**: Google's V8 engine provides its own benchmarking tools for testing JavaScript performance. Keep in mind that these alternatives might have different features, complexity levels, or requirements compared to the MeasureThat.net approach.
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document.head vs document.getElementsByTagName("head")[0]
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