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querySelector data attribute without value vs class name
(version: 0)
Comparing performance of:
data attribute vs class name
Created:
3 years ago
by:
Guest
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HTML Preparation code:
<div class="test" data-attribute="test"></div> <div class="test" data-attribute="test"></div> <div class="test" data-attribute="test"></div> <div class="test" data-attribute="test"></div> <div class="test" data-attribute="test"></div> <div class="test" data-attribute="test"></div> <div class="test" data-attribute="test"></div> <div class="test" data-attribute="test"></div> <div class="test" data-attribute="test"></div> <div class="test" data-attribute="test"></div> <div class="test" data-attribute="test"></div> <div class="test" data-attribute="test"></div> <div class="test" data-attribute="test"></div> <div class="test" data-attribute="test"></div> <div class="test" data-attribute="test"></div> <div class="test" data-attribute="test"></div> <div class="test" data-attribute="test"></div> <div class="test" data-attribute="test"></div> <div class="test" data-attribute="test"></div> <div class="test" data-attribute="test"></div> <div class="test" data-attribute="test"></div> <div class="test" data-attribute="test"></div> <div class="test" data-attribute="test"></div> <div class="test" data-attribute="test"></div>
Tests:
data attribute
var test = document.querySelector('[data-attribute]');
class name
var test = document.querySelector('.test');
Rendered benchmark preparation results:
Suite status:
<idle, ready to run>
Run tests (2)
Previous results
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Test case name
Result
data attribute
class name
Fastest:
N/A
Slowest:
N/A
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Autogenerated LLM Summary
(model
llama3.2:3b
, generated one year ago):
**Benchmark Overview** The provided benchmark measures the performance difference between using data attributes and class names to select elements in HTML documents. **What is being tested?** Two individual test cases are compared: 1. **Data Attribute**: The code `var test = document.querySelector('[data-attribute]');` is executed. 2. **Class Name**: The code `var test = document.querySelector('.test');` is executed. These tests aim to determine which approach (using data attributes or class names) is faster when querying the DOM for elements. **Options compared** The two options being compared are: * Using a data attribute (`data-attribute`) in an HTML element's attribute. * Using a class name (`class name`) to select an HTML element. **Pros and Cons of each approach** **Data Attribute:** Pros: * More semantic and descriptive, as it provides additional information about the element's properties. * Can be used to store dynamic data that is specific to the element. Cons: * May not work in older browsers or versions of Internet Explorer. * Can lead to slower performance if there are many elements with identical attributes. **Class Name:** Pros: * Widely supported by modern browsers and versions of Internet Explorer. * Fast and efficient, as class names can be easily calculated using JavaScript. Cons: * Less semantic than data attributes, as it only provides a way to group related elements. * Can lead to slower performance if there are many elements with similar classes. **Library usage** There is no specific library mentioned in the benchmark definition. However, `document.querySelector()` is a part of the DOM (Document Object Model) API, which is a standard JavaScript API for interacting with HTML documents. **Special JS feature or syntax** None is explicitly mentioned. **Other considerations** * The benchmark uses multiple instances of identical HTML elements to ensure consistent results. * The test cases use different selectors (`[data-attribute]` and `.test`) to isolate the performance difference between data attributes and class names. * The benchmark measures the executions per second (ExecutionsPerSecond) for each test case, which provides a good indication of performance. **Alternatives** Other alternatives for selecting elements in HTML documents include: * `document.getElementById()` or `document.getElementsByTagName()`, which can be slower than `querySelector` but provide more control over element selection. * CSS selectors, which can be used to select elements based on their styles or properties.
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