Benchmark: DOM subtree creation: top down vs bottom up

Tests:

bottom up
const container = document.createElement('div'); container.className = 'banner-container'; const content = document.createElement('div'); content.className = 'banner-content'; const copy = document.createElement('p'); copy.className = 'banner-copy'; copy.textContent = 'text content'; content.appendChild(copy); const closeButton = document.createElement('button'); closeButton.className = 'banner-close'; closeButton.addEventListener('click', event => { container.style.display = 'none' }); container.append(content, closeButton);
top down
const container = document.createElement('div'); container.className = 'banner-container'; const content = container.appendChild(document.createElement('div')); content.className = 'banner-content'; const copy = content.appendChild(document.createElement('p')); copy.className = 'banner-copy'; copy.textContent = 'text content'; const closeButton = container.appendChild(document.createElement('button')); closeButton.className = 'banner-close'; closeButton.addEventListener('click', event => { container.style.display = 'none' });
mixed
const content = document.createElement('div'); content.className = 'banner-content'; const copy = content.appendChild(document.createElement('p')); copy.className = 'banner-copy'; copy.textContent = 'text content'; const closeButton = document.createElement('button'); closeButton.className = 'banner-close'; closeButton.addEventListener('click', event => { container.style.display = 'none' }); const container = document.createElement('div'); container.className = 'banner-container'; container.append(content, closeButton);

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
bottom up
top down
mixed

Fastest: N/A

Slowest: N/A

Latest run results:

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Autogenerated LLM Summary (model llama3.2:3b, generated one year ago):

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**Benchmark Overview**

The provided benchmark measures the performance difference between two approaches to create a DOM subtree: top-down and bottom-up. The test cases involve creating a simple HTML structure with a container, content, copy, and close button.

**Top-Down Approach**

In the top-down approach, the container element is created first, followed by the content element, which is then appended to the container along with the close button. This order of creation creates a tree-like structure where the parent (container) is created before its children (content and close button).

**Bottom-Up Approach**

In the bottom-up approach, the content element is created first, followed by the copy element, which is then appended to the content element. The container element is created later and appended to the content element.

**Mixed Approach**

The mixed approach combines elements from both top-down and bottom-up approaches. In this case, the container element is created after the content element has already been created, but before it's appended to the close button.

**Library Usage**

No external libraries are used in these test cases. The `document.createElement()` method is a native JavaScript API that creates new DOM elements.

**Special JS Features/Syntax**

None of the test cases use any special JavaScript features or syntax beyond standard ES6 features (e.g., arrow functions, template literals).

**Pros and Cons of Each Approach**

1. **Top-Down Approach**
	* Pros:
		+ Creates a clear tree-like structure for the DOM
		+ Can be more efficient in terms of memory allocation
	* Cons:
		+ May require more overhead to append elements to the container
2. **Bottom-Up Approach**
	* Pros:
		+ Can reduce overhead when appending elements to the content
	* Cons:
		+ Creates a non-tree-like structure for the DOM, which may lead to performance issues
3. **Mixed Approach**
	* Pros:
		+ Combines the benefits of both approaches (tree-like structure and reduced overhead)
	* Cons:
		+ May still require significant overhead when appending elements to the container

**Alternative Approaches**

Other approaches to create DOM subtrees might include:

1. Using a library like React or Angular, which provide optimized methods for creating and managing DOM trees.
2. Utilizing WebAssembly or other low-level technologies that allow for more direct manipulation of the DOM.
3. Employing techniques like ahead-of-time (AOT) compilation or just-in-time (JIT) optimization to improve performance.

It's worth noting that these alternative approaches might require significant changes to the underlying HTML structure and may not be as straightforward to implement.

Related benchmarks:

DOM subtree creation: top down vs bottom up (version: 0)

Comparing performance of: bottom up vs top down vs mixed

Created: 3 years ago by: Guest

Jump to the latest result

bottom up

top down

mixed

Suite status: <idle, ready to run>

Fastest: N/A

Slowest: N/A

No previous run results

Autogenerated LLM Summary (model llama3.2:3b, generated one year ago):