The read-only property returns an integer that represents the number of style declarations in this CSS declaration block.


var num = styles.length;


An integer that provides the number of styles explictly set on the parent of the instance.


The following gets the number of explicitly set styles on the following HTML element:

<div id="div1" style="margin: 0 10px; background-color: #CA1; font-family: monospace"></div>

JavaScript code:

var myDiv = document.getElementById('div1'); var divStyle = myDiv.style; var len = divStyles.length; // 3


Specification Status Comment
CSS Object Model (CSSOM)
The definition of 'CSSStyleDeclaration.length' in that specification.
Working Draft  
Document Object Model (DOM) Level 2 Style Specification
The definition of 'CSSStyleDeclaration' in that specification.

Browser compatibility

FeatureChromeEdgeFirefoxInternet ExplorerOperaSafari
Basic support Yes Yes Yes Yes Yes Yes
FeatureAndroid webviewChrome for AndroidEdge mobileFirefox for AndroidOpera AndroidiOS SafariSamsung Internet
Basic support Yes Yes Yes Yes Yes Yes ?

Document Tags and Contributors

Contributors to this page: connorshea, david_ross, Qantas94Heavy
Last updated by: connorshea,