Let's break down the benchmark and explain what's being tested.

Benchmark Overview

The benchmark measures the performance difference between two ways to check if an HTML element has a specific class: className.includes (a method on the element object) vs classList.contains (a method on the element.classList object).

Options Compared

Two options are compared:

1. className.includes
2. classList.contains

Pros and Cons of Each Approach

1. className.includes:
   • Pros: Simple, straightforward, and widely supported.
   • Cons: May not be as efficient or readable as the alternative method.
   • Notes: This approach uses a property access (.includes) on the element object's className property. While it works, it can lead to slower performance compared to the alternative method.
2. classList.contains:
   • Pros: More efficient, modern, and readable.
   • Cons: Requires modern browsers that support the classList API (introduced in CSS3).
   • Notes: This approach uses a method call on the element.classList object. It's a more recent development but is now widely supported.

Library/ Framework

There is no explicit library mentioned, but the use of element.classList suggests that modern browsers with CSS3 support are being tested.

JavaScript Features/Syntax

The benchmark doesn't explicitly require any special JavaScript features or syntax other than modern browser support. However, it's worth noting that the ?. operator (optional chaining) is used in some test cases, which was introduced in ECMAScript 2020.

Other Alternatives

If you were to write this benchmark from scratch, alternative approaches might include:

1. Using a library like Lodash or Ramda for utility functions.
2. Implementing your own class list checking logic using bitwise operations (e.g., checking if a specific mask is set).
3. Utilizing native WebAssembly (WASM) performance optimization techniques.

Keep in mind that these alternatives would likely require more significant changes to the benchmark and might not be as representative of real-world usage patterns.

I hope this explanation helps you understand what's being tested in the MeasureThat.net benchmark!