Benchmark: meta tag selection

HTML Preparation code:

<meta name="meow"/>

Tests:

tagname
var m = document.getElementsByTagName('meow');
query head
var m = document.head.querySelector("meta[name='meow']")
query
var m = document.querySelector("meta[name='meow']")

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
tagname
query head
query

Fastest: N/A

Slowest: N/A

Autogenerated LLM Summary (model llama3.2:3b, generated 26 days ago):

LLMs can make mistakes. Check important info.

I'll break down the benchmark definition and explain what's being tested, compared options, pros and cons, and other considerations.

**Benchmark Definition**

The benchmark is testing the performance of different approaches to select a meta tag with the name "meow" in an HTML document. The three test cases use the following JavaScript code:

1. `var m = document.getElementsByTagName('meow');` - This approach uses the `getElementsByTagName()` method to retrieve all elements with the name "meow".
2. `var m = document.head.querySelector("meta[name='meow']")` - This approach uses the `querySelector()` method on the `document.head` element to select a single element with the attribute `name="meow"`.
3. `var m = document.querySelector("meta[name='meow']")` - This approach uses the `querySelector()` method on the entire `document` object to select a single element with the attribute `name="meow"`.

**Comparison of Options**

The three approaches differ in how they access the meta tag:

* `getElementsByTagName()`: Returns an array of all elements with the name "meow", including possible duplicates. This approach is simple but may be slower if there are many duplicate tags.
* `querySelector()` on `document.head`: Selects a single element with the attribute `name="meow"` from the head section of the HTML document. This approach is more efficient than `getElementsByTagName()`, as it only considers elements within the head section.
* `querySelector()` on `document`: Similar to the previous approach, but searches all elements in the document.

**Pros and Cons**

Here are some pros and cons of each approach:

1. `getElementsByTagName()`:
	* Pros: Simple and easy to implement.
	* Cons: May be slower due to duplicate tags, and may not return results if there is only one tag with the name "meow".
2. `querySelector()` on `document.head`:
	* Pros: Efficient, as it limits the search space to the head section.
	* Cons: Requires that the meta tag is in the head section, which might not always be the case.
3. `querySelector()` on `document`:
	* Pros: Similar to the previous approach, but searches all elements in the document.
	* Cons: Less efficient than using `document.head`, as it considers more elements.

**Libraries and Special Features**

There are no libraries used in this benchmark. However, note that the use of `querySelector()` is a modern JavaScript feature (introduced in ECMAScript 2014) and may not be supported in older browsers or environments.

**Other Considerations**

* The benchmark assumes that the meta tag with the name "meow" exists in the HTML document.
* The benchmark does not account for other factors that might affect performance, such as the size of the HTML document, the number of tags with the same name, or the browser's caching mechanisms.

**Alternatives**

Other alternatives to these approaches include:

1. Using a CSS selector (e.g., `meta[name="meow"]`) instead of JavaScript.
2. Using a library like jQuery or a modern JavaScript framework (e.g., React) that provides optimized methods for selecting elements.
3. Optimizing the HTML document structure and meta tag placement to reduce the number of tags with the same name.

Keep in mind that these alternatives may have different trade-offs in terms of complexity, performance, and maintainability.

Latest run results:

Run details: (Test run date: 7 years ago)

User agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/46.0.2486.0 Safari/537.36 Edge/13.10586

Browser/OS: Chrome 46 on Windows

View result in a separate tab

Test name	Executions per second
tagname	3516592.0 Ops/sec
query head	164990.9 Ops/sec
query	107190.5 Ops/sec

Related benchmarks:

meta tag selection (version: 0)

Comparing performance of: tagname vs query head vs query

Created: 7 years ago by: Guest

Jump to the latest result

tagname

query head

query

Suite status: <idle, ready to run>

Experimental features:

Fastest: N/A

Slowest: N/A

Autogenerated LLM Summary (model llama3.2:3b, generated 26 days ago):