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# HTMLCollection length Property [ DOM HTMLCollection](#) * * * ## Definition and Usage The length property returns the number of elements in an HTMLCollection object. This property is read-only. This property is useful when looping through an HTMLCollection object. ## Syntax HTMLCollection.length ### Return Value Returns a number representing the number of elements in the HTMLCollection object. * * * ## Browser Support | Property | | | | | | | --- | --- | --- | --- | --- | --- | | length | Yes | Yes | Yes | Yes | Yes | * * * ## Example ## Example Loop through all elements with class="myclass" and change their background color: var x = document.getElementsByClassName("myclass"); for(i = 0; i<x.length; i++){x.item(i).style.backgroundColor = "red"; } [Try it Yourself »](#) * * * ## Related Articles HTMLCollection: [item()](#) Method HTML Element: [getElementsByClassName()](#) Method HTML Element: [getElementsByTagName()](#) Method * * DOM HTMLCollection](#)