Benchmark: window.getComputedStyle vs. getBoundingClientRect 1111

HTML Preparation code:

<div id="foo"></div>

Tests:

getComputedStyle
var i = 5000; while (i--) { checkDisplay('foo'); } function checkDisplay(id) { return window.getComputedStyle(document.getElementById(id), null).getPropertyValue("display") === "none"; }
getClientRects
var i = 5000; while (i--) { checkDisplay('foo'); } function checkDisplay(id) { return document.getElementById(id).getClientRects().width === 0; }

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
getComputedStyle
getClientRects

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.

**Benchmark Purpose**

The benchmark tests two approaches to determine if an HTML element is hidden (i.e., its display property is set to "none").

**Approaches Compared**

1. `window.getComputedStyle(document.getElementById(id), null).getPropertyValue("display") === "none"`
2. `document.getElementById(id).getClientRects().width === 0`

**Pros and Cons of Each Approach:**

1. **`window.getComputedStyle` approach:**
	* Pros:
		+ Can be more accurate, as it checks the actual CSS properties applied to the element.
		+ Does not rely on browser-specific features like `getClientRects`.
	* Cons:
		+ May be slower, as it needs to parse and access the element's styles.
		+ May not work in older browsers that do not support CSS properties.
2. **`getClientRects` approach:**
	* Pros:
		+ Can be faster, as it only needs to measure the element's width.
		+ Works in most modern browsers.
	* Cons:
		+ Relies on browser-specific features (e.g., `getClientRects` is not supported in older browsers).
		+ May not work if the element has a non-zero width due to other styles or layout.

**Library Used**

None. This benchmark does not use any external libraries.

**Special JS Feature/ Syntax**

None mentioned in this specific benchmark, but note that some modern JavaScript features and syntax might be used in other benchmarks.

**Other Alternatives**

If you wanted to test a different approach, you could consider:

1. `element.style.display === "none"`: This checks the element's CSS style directly.
2. `document.querySelector('#foo').style.display === 'none'`: This uses the querySelector API to select the element and then checks its display style.

Keep in mind that these alternatives might have similar pros and cons as the approaches tested in this benchmark.

I hope this explanation helps!

Related benchmarks:

window.getComputedStyle vs. getBoundingClientRect 1111 (version: 0)

Comparing performance of: getComputedStyle vs getClientRects

Created: 2 years ago by: Guest

Jump to the latest result

getComputedStyle

getClientRects

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):