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tag VS class
(version: 0)
Comparing performance of:
class vs tag
Created:
2 years ago
by:
Guest
Go to the latest result
HTML Preparation code:
<div class="hello" id="hello" data-hello>Hello</div>
Tests:
class
document.querySelector('.hello');
tag
document.querySelector('div');
Rendered benchmark preparation results:
Suite status:
<idle, ready to run>
Run tests (2)
Previous results
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Test case name
Result
class
tag
Fastest:
N/A
Slowest:
N/A
Latest run results:
Run details:
(Test run date:
one year ago
)
User agent:
Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/129.0.0.0 Safari/537.36
Browser/OS:
Chrome 129 on Mac OS X 10.15.7
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Embed Benchmark Result
<iframe src="https://measurethat.net/Embed?id=566720" width="100%" height="500px"></iframe>
tag
4.5M/s
class
4.3M/s
View exact numbers
Test name
Executions per second
✓
tag
4,452,271 Ops/sec
class
4,295,418 Ops/sec
Autogenerated LLM Summary
(model
llama3.2:3b
, generated one year ago):
Let's break down the provided benchmarking setup and analyze what's being tested, compared, and considered. **What is being tested?** The main objective of this benchmark is to compare the performance of two different approaches: using class selectors (`class`) versus using tag selectors (`tag`). The test case "document.querySelector('.hello');" is used to measure the performance of both approaches. **Options compared** Two options are being compared: 1. **Class selectors (`class`)**: This approach uses a dot (`.`) followed by a space and then the class name to select elements. 2. **Tag selectors (`tag`)**: This approach uses a single element type (e.g., `div`, `p`, etc.) to select elements. **Pros and Cons of each approach** 1. **Class selectors (`class`)**: * Pros: + More specific and flexible, as classes can be combined using multiple dots (e.g., `.hello .world`). + Can be used to target elements with dynamic or attribute-based styles. * Cons: + May lead to slower performance due to the need for more complex parsing and matching. 2. **Tag selectors (`tag`)**: * Pros: + Faster performance, as the browser can use caching and optimization techniques. + Easier to read and understand, especially for simple scenarios. * Cons: + Less flexible, as it only selects elements of a specific type. + May lead to more elements being matched accidentally. **Other considerations** 1. **CSS Preprocessing**: When using class selectors, the browser may need to preprocess CSS rules before applying them, which can add overhead. In contrast, tag selectors typically don't require preprocessing. 2. **DOM Manipulation**: If you're manipulating or modifying elements in your JavaScript code, using a class selector might lead to additional DOM changes, which can slow down performance. **Library usage** None of the provided test cases use external libraries. However, if they did, it's likely that the library would provide functions for working with CSS selectors (e.g., `querySelector`, `querySelectorAll`). **Special JS feature or syntax** This benchmark does not explicitly test any special JavaScript features or syntax. **Alternatives** If you wanted to create a similar benchmark, you could consider adding more test cases, such as: * Using attribute selectors (`[attribute]`) * Combining class and tag selectors (e.g., `div.class` or `.class` followed by an element type) * Testing performance with different number of elements or complexity Keep in mind that the specific alternatives would depend on your goals and the scope of your benchmark. To create a new benchmark, you can use tools like MeasureThat.net's API or write custom scripts to generate test cases. You can also explore other benchmarks and libraries, such as: * JSPerf * BrowserStack * WebPageTest These resources provide various ways to measure and compare performance in different browsers and environments.
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