Let's break down the benchmark definition and results.

Benchmark Definition:

The benchmark is called "innerHTML vs insertAdjacentHTML vs appendChild vs insertAdjacentElement 2". It compares four different methods for inserting HTML content into an existing HTML element:

1. insertAdjacentHTML
2. appendChild
3. insertAdjacentElement

The test case uses two HTML elements, box1 and box2, which are created using the document.createElement() method.

Test Cases:

There are three individual test cases:

1. insertAdjacentHTML: This test case uses the insertAdjacentHTML method to insert the content of box2 into box1.
   • Code: box1.insertAdjacentHTML('beforeend', box2);
   • Purpose: To measure the time it takes to insert HTML content using this method.
2. appendChild: This test case uses the appendChild method to append the content of box2 to box1.
   • Code: box1.appendChild(box2);
   • Purpose: To measure the time it takes to append an existing HTML element to another element.
3. insertAdjacentElement: This test case uses the insertAdjacentElement method to insert the content of box2 into box1, similar to insertAdjacentHTML.
   • Code: box1.insertAdjacentElement('beforeend', box2);
   • Purpose: To measure the time it takes to insert an existing HTML element using this method.

Latest Benchmark Results:

The results show the execution speed ( Executions Per Second) of each test case on a Chrome 118 browser running on Windows:

1. appendChild: 573261.4375 executions per second
2. insertAdjacentElement: 550334.25 executions per second
3. insertAdjacentHTML: 136518.90625 executions per second

What is being tested:

The benchmark is testing the performance of four different methods for inserting HTML content into an existing element:

• insertAdjacentHTML: Inserts HTML content as a string, without parsing it.
• appendChild: Appends an existing HTML element to another element.
• insertAdjacentElement: Inserts an existing HTML element into another element.

Pros and Cons:

The choice of method depends on the specific use case:

• insertAdjacentHTML:
  • Pros: Fast execution speed, suitable for inserting large amounts of HTML content as a string.
  • Cons: May have security implications if the inserted HTML content is not sanitized properly.
• appendChild:
  • Pros: Suitable for appending existing HTML elements to another element, without modifying the DOM structure.
  • Cons: May be slower than insertAdjacentHTML or insertAdjacentElement, depending on the complexity of the appended element.
• insertAdjacentElement:
  • Pros: Suitable for inserting existing HTML elements into another element, with a syntax similar to insertAdjacentHTML.
  • Cons: May have security implications if the inserted element is not properly sanitized.

Other Considerations:

When choosing an insertion method, consider factors like:

• Performance requirements
• Security implications of inserting untrusted HTML content
• DOM structure and layout modifications

In this benchmark, the results show that appendChild and insertAdjacentElement have similar execution speeds on Chrome 118, while insertAdjacentHTML is significantly slower. However, the choice of method should be based on the specific use case and requirements.