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

DOMTokenList: length property - Web APIs

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The read-only length property of the DOMTokenList interface is an integer representing the number of objects stored in the object.

An positive integer, or 0 if the list is empty.

In the following example we retrieve the list of classes set on a <span> element as a DOMTokenList using Element.classList, then write the length of the list to the <span>'s Node.textContent.

First, the HTML:

<span class="a b c"></span>

Now the JavaScript:

const span = document.querySelector("span");
const classes = span.classList;
const length = classes.length;

span.textContent = `classList length = ${length}`;

The output looks like this:

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