Benchmark: ac4a526a-71a7-4ee8-a9eb-3df388fff075

HTML Preparation code:

<div id="test-div"></div>

Script Preparation code:

function isInDOM1(oHTMLElement) {                                   
  if (oHTMLElement === document.body || oHTMLElement === document ) {
    return true;
  } else {
    try {
      return document.body.contains(oHTMLElement);
    } catch(ex) {
      // Sometimes in Firefox element is anonymous div around input.
      // Throws error "TypeError: Argument 1 of Node.contains does not implement interface Node"
      // See https://bugzilla.mozilla.org/show_bug.cgi?id=208427
      return false;
    }
  }
}

function isInDOM2(oHTMLElement) {                                   
  var root = oHTMLElement.ownerDocument; 
  if (!root) { return false; }
  
  if ( oHTMLElement.ownerDocument.documentElement === document.documentElement ){ return true; }

  return false;
}

function isInDOM3(oHTMLElement) {
  var node = oHTMLElement;
  var documentRoot = document.body.getRootNode();
  while (node.parentNode !== documentRoot && node.parentNode !== undefined && node.parentNode !== null)
    node = node.parentNode;
  
  return node.parentNode === documentRoot;
}

var div = document.getElementById('test-div');

Tests:

isInDOM1
isInDOM1(div);
isInDOM2
isInDOM2(div);
isInDOM3
isInDOM3(div);

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
isInDOM1
isInDOM2
isInDOM3

Fastest: N/A

Slowest: N/A

Latest run results:

No previous run results

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

LLMs can make mistakes. Check important info.

Let's dive into the explanation of the provided benchmark.

**Benchmark Definition**

The benchmark is designed to measure the performance of JavaScript functions that check if an element is in the Document Object Model (DOM). The three functions, `isInDOM1`, `isInDOM2`, and `isInDOM3`, are compared to determine which one is the most efficient.

**Options Compared**

There are three different approaches:

1. **`isInDOM1`**: This function checks if the element is either the document body or document itself. It uses a simple if-else statement to make this check.
2. **`isInDOM2`**: This function first gets the owner document of the element using `oHTMLElement.ownerDocument`. If it's null, it returns false. Otherwise, it checks if the element's root node is the same as the document's root node. If so, it returns true. Otherwise, it returns false.
3. **`isInDOM3`**: This function traverses up the DOM tree from the element to the document body using a while loop, checking if each parent node is the document body. If it reaches the document body, it returns true.

**Pros and Cons of Each Approach**

1. **`isInDOM1`**:
	* Pros: Simple and easy to understand.
	* Cons: May throw errors in certain cases (e.g., when the element is an anonymous div around an input field) due to the `contains()` method being called on a node that doesn't implement the `Node` interface. This can lead to performance issues, especially in Firefox.
2. **`isInDOM2`**:
	* Pros: More accurate than `isInDOM1`, as it correctly handles cases where the element's owner document is not the same as the document's root node.
	* Cons: Requires an extra operation to get the owner document and check its root node, which may introduce overhead.
3. **`isInDOM3`**:
	* Pros: Efficiently traverses up the DOM tree without requiring any additional operations or checks.
	* Cons: More complex than `isInDOM1`, as it uses a while loop to traverse the tree.

**Library and Special JS Features**

None of the provided functions use any external libraries. However, they do utilize some special JavaScript features:

* `oHTMLElement.ownerDocument` is used to get the owner document of an element.
* The `contains()` method is called on nodes that may not implement the `Node` interface, which can lead to errors in certain cases.

**Other Considerations**

The benchmark also considers various factors such as:

* The number of executions per second (ExecutionsPerSecond) for each test case.
* The device platform and operating system used for each test run.

**Alternatives**

If you were to create a new benchmark with similar functionality, you could consider the following alternatives:

* Using `Element.contains()` instead of `contains()` on nodes, which is a more modern and standardized method.
* Utilizing Web Workers or other parallel processing techniques to measure performance in a multi-threaded environment.
* Including additional test cases that cover edge scenarios, such as checking if an element is in the DOM when it's not present at all.

Keep in mind that the choice of approach depends on the specific requirements and constraints of your benchmark.

Related benchmarks:

ac4a526a-71a7-4ee8-a9eb-3df388fff075 (version: 0)

Check if given element is in dom

Comparing performance of: isInDOM1 vs isInDOM2 vs isInDOM3

Created: 5 years ago by: Registered User

Jump to the latest result

isInDOM1

isInDOM2

isInDOM3

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):