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insertAdjacentHTML with outerHTML vs append with CloneNode
(version: 0)
Comparing performance of:
append vs insertAdjacentHTML
Created:
4 years ago
by:
Guest
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HTML Preparation code:
<div id="test"></div>
Tests:
append
var newElement = document.createElement("div"); newElement.id = "testing" for (i = 0; i < 1000; i++) { var newElementPart = document.createElement("div"); newElementPart.classList.add("testClass"); newElement.append(newElementPart); } document.getElementById("test").append(newElement.cloneNode(true));
insertAdjacentHTML
var newElement = document.createElement("div"); newElement.id = "testing" for (i = 0; i < 1000; i++) { var newElementPart = document.createElement("div"); newElementPart.classList.add("testClass"); newElement.append(newElementPart); } document.getElementById("test").insertAdjacentHTML("beforeend", newElement.outerHTML);
Rendered benchmark preparation results:
Suite status:
<idle, ready to run>
Run tests (2)
Previous results
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Test case name
Result
append
insertAdjacentHTML
Fastest:
N/A
Slowest:
N/A
Latest run results:
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Autogenerated LLM Summary
(model
llama3.2:3b
, generated one year ago):
Measuring performance in JavaScript can be challenging due to the dynamic nature of the language, but let's break down what's being tested here. **Benchmark Definition** The benchmark definition consists of two test cases: `append` and `insertAdjacentHTML`. Both tests compare the performance of creating a large number of HTML elements using different methods. **Options Compared** 1. **Append vs InsertAdjacentHTML with outerHTML**: The main difference between these two approaches is how they manipulate the DOM tree. * `append`: Creates a new element, clones it, and appends it to an existing element in a single step. This can lead to multiple DOM mutations, which can be expensive. * `insertAdjacentHTML with outerHTML`: Inserts a string of HTML into the DOM at a specified position using the `outerHTML` property. This method only involves one DOM mutation. 2. **Using `CloneNode` vs not**: The first test case uses `CloneNode` to create a copy of the new element, while the second test case does not use it. **Pros and Cons** 1. **Append**: * Pros: Can be more intuitive for developers familiar with appending elements. * Cons: May lead to multiple DOM mutations, which can impact performance. 2. **InsertAdjacentHTML with outerHTML**: * Pros: Only involves one DOM mutation, making it potentially faster and more efficient. * Cons: Requires the use of `outerHTML` and inserting HTML strings into the DOM, which might be less familiar for some developers. 3. **Using `CloneNode` vs not**: * Using `CloneNode`: Can help reduce the number of DOM mutations by creating a copy of the element before appending it. * Not using `CloneNode`: May result in multiple DOM mutations if the same element is appended multiple times. **Other Considerations** 1. **DOM Manipulation**: The performance impact of manipulating the DOM tree can vary depending on the browser, version, and platform. Some browsers might optimize certain methods better than others. 2. **Memory Allocation**: Creating a large number of elements and appending them to the DOM can lead to increased memory allocation and deallocation, which might affect performance. **Library Usage** In the benchmark definition, the `document.createElement` method is used to create new elements. This is a standard JavaScript method for creating HTML elements. **Special JS Features or Syntax** There are no special JS features or syntax used in this benchmark that would require specific knowledge of JavaScript beyond what's mentioned above. **Alternatives** 1. **V8 Benchmark Suite**: Measuring performance in V8 (the engine used by Google Chrome) is a more comprehensive approach, as it provides a more detailed understanding of the JavaScript engine's performance characteristics. 2. **Benchmarking Frameworks**: Using a dedicated benchmarking framework like Benchmark.js or JSPerf can provide more accurate and reliable results. In conclusion, this benchmark aims to compare the performance of different methods for creating and appending HTML elements in JavaScript. Understanding the pros and cons of each approach, as well as considering other factors like DOM manipulation and memory allocation, is crucial for optimizing performance in JavaScript applications.
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