Benchmark: Is in DOM Take 2

HTML Preparation code:

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

Script Preparation code:

function isInDOM1(oHTMLElement) {                                   
  if (oHTMLElement === document.body || oHTMLElement === document ) { return true; } 
  
  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) {               
  if (!oHTMLElement.ownerDocument) { return false; }
  
  if ( oHTMLElement.ownerDocument.documentElement === document.documentElement ){ return true; }

  return false;
}

var div = document.getElementById('test-div');

Tests:

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

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
isInDOM1
isInDOM2

Fastest: N/A

Slowest: N/A

Latest run results:

No previous run results

This benchmark does not have any results yet. Be the first one to run it!

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

LLMs can make mistakes. Check important info.

Let's break down the provided benchmark definition and test cases to understand what is being tested, the options compared, their pros and cons, and other considerations.

**Benchmark Definition**

The benchmark defines two test cases:

1. `isInDOM1(oHTMLElement)`: This function checks if a given element (`oHTMLElement`) is in the DOM (Document Object Model). It uses a try-catch block to handle potential errors that may occur when checking if an element is contained within the `document.body`. The function also has a special case for Firefox, where it checks if the element's owner document matches the current document.
2. `isInDOM2(oHTMLElement)`: This function checks if an element (`oHTMLElement`) is in the DOM (Document Object Model). It uses a simple check to see if the element's owner document is equal to the current document.

**Options Compared**

The two test cases compare the performance of two different approaches:

1. `isInDOM1(oHTMLElement)`: This function uses a try-catch block and a special case for Firefox.
2. `isInDOM2(oHTMLElement)`: This function uses a simple check.

**Pros and Cons**

**`isInDOM1(oHTMLElement)`**

Pros:

* Handles potential errors that may occur when checking if an element is contained within the `document.body`.
* Has a special case for Firefox, which may improve performance in this specific browser.

Cons:

* May introduce additional overhead due to the try-catch block.
* The special case for Firefox may not be necessary or optimal for other browsers.

**`isInDOM2(oHTMLElement)`**

Pros:

* Simple and straightforward implementation.
* Does not introduce any potential errors that may occur when checking if an element is contained within the `document.body`.

Cons:

* May not handle errors that occur when checking if an element is contained within the `document.body`.
* May not be optimized for Firefox.

**Other Considerations**

* The benchmark uses a simple HTML structure with a single `<div>` element, which may not accurately represent real-world scenarios.
* The benchmark does not consider other factors that may affect performance, such as memory allocation or garbage collection.
* The use of `document.getElementById('test-div')` to retrieve the `<div>` element may introduce additional overhead due to DOM manipulation.

**Library Usage**

The benchmark uses the following libraries:

* None explicitly stated in the provided code.

However, it's worth noting that the `document` object and its methods (e.g., `document.body`, `document.getElementById`) are part of the JavaScript standard library, which is included with every JavaScript engine.

**Special JS Features or Syntax**

The benchmark does not use any special JavaScript features or syntax. The code appears to be written in vanilla JavaScript.

**Alternatives**

Other alternatives for testing DOM-related functions could include:

* Using a library like jQuery, which provides a simplified way of interacting with the DOM.
* Implementing a custom DOM manipulation framework.
* Using a benchmarking library specifically designed for web performance optimization, such as WebPageTest or Lighthouse.

Related benchmarks:

Is in DOM Take 2 (version: 0)

Check if given element is in dom

Comparing performance of: isInDOM1 vs isInDOM2

Created: 7 years ago by: Guest

Jump to the latest result

isInDOM1

isInDOM2

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):