Benchmark: jr_test_contains_vs_closest

HTML Preparation code:

<div id='div1'>
  <div id='div2'>
    <div id='div3'>
    </div>
  </div>
</div>

Script Preparation code:

var box = document.getElementById('div1');
var clicked = document.getElementById('div3');

Tests:

contains
const isClickInside = box.contains(clicked); return isClickInside;
closest
const isClickInside = clicked.closest('#div1'); return isClickInside;

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
contains
closest

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 break down the provided benchmark definition and test cases to understand what's being tested.

**Benchmark Definition:**

The website measures the performance of two methods: `contains()` and `closest()`. The `contains()` method checks if an element is contained within another element, while `closest()` finds the closest ancestor element that matches a specified selector.

**Script Preparation Code:**
```javascript
var box = document.getElementById('div1');
var clicked = document.getElementById('div3');
```
This code retrieves two elements from the HTML page using their IDs: `box` (the outermost container) and `clicked` (a child element within `box`).

**Html Preparation Code:**
```html
<div id='div1'>
  <div id='div2'>
    <div id='div3'>
    </div>
  </div>
</div>
```
This HTML code defines the structure of the page, where `div1` is the outermost container, and `div3` is a child element within it.

**Individual Test Cases:**

There are two test cases:

### contains

```javascript
const isClickInside = box.contains(clicked);
return isClickInside;
```
This code checks if `clicked` (the innermost element) is contained within `box` (the outermost container). The `contains()` method returns a boolean value indicating whether the element is found.

### closest

```javascript
const isClickInside = clicked.closest('#div1');
return isClickInside;
```
This code uses the `closest()` method to find the closest ancestor element that matches the selector `#div1`. Since `div3` is already inside `div1`, this method will return a reference to itself. The result is then returned.

**Pros and Cons:**

*   **contains():**
    *   Pros:
        *   Simple and intuitive
        *   Works well for most cases
    *   Cons:
        *   Can be slower than `closest()` due to the overhead of checking each element in the DOM tree
*   **closest():**
    *   Pros:
        *   Often faster than `contains()`
        *   Handles cases where the target element is not directly contained within another element
    *   Cons:
        *   More complex and may have a higher chance of errors

**Library:**

The `closest()` method uses the Web Content Accessibility Guidelines (WCAG) 2.1 specification, which defines an API for finding the closest ancestor element that matches a specified selector.

**Special JS Feature/Syntax:**

None mentioned in this benchmark definition.

**Other Alternatives:**

If you need to check if an element is contained within another, you can use:

*   `contains()` with the `Element.contains()` method (Chrome 114)
*   `closest()` with a more specific selector (e.g., `closest('#div1')`)

Keep in mind that the performance difference between these methods may vary depending on your specific use case and the browser being used.

Related benchmarks:

jr_test_contains_vs_closest (version: 0)

which is faster: contains or closest?

Comparing performance of: contains vs closest

Created: 2 years ago by: Guest

Jump to the latest result

contains

closest

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):