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SLEEK - Selector test
(version: 0)
Comparing performance of:
Sleek vs ID vs Data attr
Created:
2 years ago
by:
Guest
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HTML Preparation code:
<div class="hello-world" id="hello-world" data-hello-world>Hello</div>
Tests:
Sleek
document.querySelector('[id^="hello--"]');
ID
document.querySelector('#hello-world');
Data attr
document.querySelector('[data-hello-world]');
Rendered benchmark preparation results:
Suite status:
<idle, ready to run>
Run tests (3)
Previous results
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Test case name
Result
Sleek
ID
Data attr
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 break down the provided benchmark and explain what's being tested. **Benchmark Overview** MeasureThat.net is a website that allows users to create and run JavaScript microbenchmarks. The provided benchmark consists of three individual test cases: 1. Sleek 2. ID 3. Data attr These test cases are designed to measure the performance of JavaScript's `document.querySelector` method under different conditions. **Test Case 1: Sleek** The first test case, "Sleek", is used to measure the performance of `document.querySelector` when using a CSS selector that starts with an attribute prefix (`[id^=\"hello--\"]`). This allows us to simulate scenarios where the attribute name starts with a specific value. **Test Case 2: ID** The second test case, "ID", measures the performance of `document.querySelector` when selecting an element by its ID (`#hello-world`). **Test Case 3: Data attr** The third test case, "Data attr", measures the performance of `document.querySelector` when selecting an element based on a data attribute (`[data-hello-world]`). **Libraries and Features Used** In this benchmark, no specific JavaScript libraries are used. However, the `document.querySelector` method is a built-in method in JavaScript's DOM API. No special JS features or syntax are required to run these test cases. **Comparison of Approaches** When measuring the performance of `document.querySelector`, we have two main approaches: 1. **Attribute-based selectors**: These methods use CSS selectors that start with an attribute prefix (`[id^=\"hello--\"]`). 2. **Id-based selection**: This method uses the ID attribute (`#hello-world`). **Pros and Cons** **Attribute-based selectors:** Pros: * More flexible, as we can specify multiple attributes to search for. * Can be more efficient when searching for elements with specific attribute values. Cons: * May be slower due to the additional processing required by the CSS selector engine. * May have higher memory usage due to the need to parse and match against multiple attributes. **Id-based selection:** Pros: * Typically faster, as it only requires a single lookup in the DOM. * Lower memory usage, as only one ID attribute needs to be processed. Cons: * Less flexible, as we are limited to searching for elements by a specific ID value. * May not work correctly if multiple elements have the same ID (i.e., conflicts). **Device Platform and Browser Considerations** The benchmark results indicate that the test cases were run on a desktop device using Chrome 115 browser. The different test cases return varying execution rates, indicating that the performance differences between attribute-based selectors and id-based selection are significant. **Other Alternatives** If you're interested in exploring alternative approaches to measuring `document.querySelector` performance, consider the following: * **QuerySelectorAll**: Instead of using a single selector, try using multiple selectors in a query. This can help simulate real-world scenarios where elements need to be retrieved from different sources. * **MutationObserver**: Use the MutationObserver API to observe changes to the DOM and measure performance under dynamic conditions. These alternatives will allow you to further explore the nuances of `document.querySelector` performance and identify potential bottlenecks in your code.
Related benchmarks:
DataAttribute vs Class Selector vs ID Selector
DataAttribute vs Class Selector vs ID Selector (multi-class)
SLEEK - Selector test 2
DataAttribute vs Class Selector vs ID Selector vs ~=
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