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Showing content from https://developer.cdn.mozilla.net/en-US/docs/Web/API/HTMLCollection/length below:

HTMLCollection: length property - Web APIs

HTMLCollection: length property

Baseline Widely available

The HTMLCollection.length property returns the number of items in a HTMLCollection.

Value

An integer value representing the number of items in a HTMLCollection.

Examples

The length property is often useful in DOM programming. It's often used to test the length of a list, to see if it exists at all. It's also commonly used as the iterator in a for loop, as in this example.

// All the elements with the class ".test" in the document
const items = document.getElementsByClassName("test");

// For each test item in the list,
// append the entire element as a string of HTML
let gross = "";
for (let i = 0; i < items.length; i++) {
  gross += items[i].innerHTML;
}

// gross is now all the HTML for the test elements
Specifications Browser compatibility

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