Tutorials References Menu

JS Reference

JS by Category JS by Alphabet

JavaScript

JS Array JS Boolean JS Classes JS Date JS Error JS Global JS JSON JS Math JS Number JS Operators JS RegExp JS Statements JS String

HTML DOM

DOM Attributes DOM Document DOM Element DOM Events DOM Event Objects DOM HTMLCollection DOM Location DOM Navigator DOM Screen DOM Style
alignContent alignItems alignSelf animation animationDelay animationDirection animationDuration animationFillMode animationIterationCount animationName animationTimingFunction animationPlayState background backgroundAttachment backgroundColor backgroundImage backgroundPosition backgroundRepeat backgroundClip backgroundOrigin backgroundSize backfaceVisibility border borderBottom borderBottomColor borderBottomLeftRadius borderBottomRightRadius borderBottomStyle borderBottomWidth borderCollapse borderColor borderImage borderImageOutset borderImageRepeat borderImageSlice borderImageSource borderImageWidth borderLeft borderLeftColor borderLeftStyle borderLeftWidth borderRadius borderRight borderRightColor borderRightStyle borderRightWidth borderSpacing borderStyle borderTop borderTopColor borderTopLeftRadius borderTopRightRadius borderTopStyle borderTopWidth borderWidth bottom boxShadow boxSizing captionSide caretColor clear clip color columnCount columnFill columnGap columnRule columnRuleColor columnRuleStyle columnRuleWidth columns columnSpan columnWidth counterIncrement counterReset cursor direction display emptyCells filter flex flexBasis flexDirection flexFlow flexGrow flexShrink flexWrap cssFloat font fontFamily fontSize fontStyle fontVariant fontWeight fontSizeAdjust height isolation justifyContent left letterSpacing lineHeight listStyle listStyleImage listStylePosition listStyleType margin marginBottom marginLeft marginRight marginTop maxHeight maxWidth minHeight minWidth objectFit objectPosition opacity order orphans outline outlineColor outlineOffset outlineStyle outlineWidth overflow overflowX overflowY padding paddingBottom paddingLeft paddingRight paddingTop pageBreakAfter pageBreakBefore pageBreakInside perspective perspectiveOrigin position quotes resize right scrollBehavior tableLayout tabSize textAlign textAlignLast textDecoration textDecorationColor textDecorationLine textDecorationStyle textIndent textOverflow textShadow textTransform top transform transformOrigin transformStyle transition transitionProperty transitionDuration transitionTimingFunction transitionDelay unicodeBidi userSelect verticalAlign visibility width wordBreak wordSpacing wordWrap widows zIndex
DOM Window

Web APIs

API Console API Geolocation API History API Storage

HTML Objects

<a> <abbr> <address> <area> <article> <aside> <audio> <b> <base> <bdo> <blockquote> <body> <br> <button> <canvas> <caption> <cite> <code> <col> <colgroup> <datalist> <dd> <del> <details> <dfn> <dialog> <div> <dl> <dt> <em> <embed> <fieldset> <figcaption> <figure> <footer> <form> <head> <header> <h1> - <h6> <hr> <html> <i> <iframe> <img> <ins> <input> button <input> checkbox <input> color <input> date <input> datetime <input> datetime-local <input> email <input> file <input> hidden <input> image <input> month <input> number <input> password <input> radio <input> range <input> reset <input> search <input> submit <input> text <input> time <input> url <input> week <kbd> <label> <legend> <li> <link> <map> <mark> <menu> <menuitem> <meta> <meter> <nav> <object> <ol> <optgroup> <option> <output> <p> <param> <pre> <progress> <q> <s> <samp> <script> <section> <select> <small> <source> <span> <strong> <style> <sub> <summary> <sup> <table> <tbody> <td> <tfoot> <th> <thead> <tr> <textarea> <time> <title> <track> <u> <ul> <var> <video>

Other References

CSSStyleDeclaration JS Conversion


JavaScript Window getComputedStyle() Method

❮ Window Object

Example

Get the computed (actual showing) background color of a div:

<div id="test" style="height: 50px;background-color: lightblue;">Test Div</div>
<p>The computed background color for the test div is: <span id="demo"></span></p>

<script>
function myFunction() {
  var elem = document.getElementById("test");
  var theCSSprop = window.getComputedStyle(elem, null).getPropertyValue("background-color");
  document.getElementById("demo").innerHTML = theCSSprop;
}
</script>
Try it Yourself »

More "Try it Yourself" examples below.


Definition and Usage

The getComputedStyle() method gets all the actual (computed) CSS property and values of the specified element.

The computed style is the style actually used in displaying the element, after "stylings" from multiple sources have been applied.

Style sources can include: internal style sheets, external style sheets, inherited styles and browser default styles.

The getComputedStyle() method returns a CSSStyleDeclaration object.


Browser Support

The numbers in the table specify the first browser version that fully supports the method.

Method
getComputedStyle() 11.0 9.0 4.0 5 11.5

Syntax

window.getComputedStyle(element, pseudoElement)

Parameter Values

Parameter Description
element Required. The element to get the computed style for
pseudoElement Optional. A pseudo-element to get


Technical Details

Return Value: A CSSStyleDeclaration object containing CSS declaration block of the element.

More Examples

Example

Get all the computed styles from an element:

<div id="test" style="height: 50px;background-color: lightblue;">Test Div</div>
<p>The computed styles for the test div are: <br><span id="demo"></span></p>

<script>
function myFunction(){
  var elem = document.getElementById("test");
  var txt;
  cssObj = window.getComputedStyle(elem, null)

  for (i = 0; i < cssObj.length; i++) {
    cssObjProp = cssObj.item(i)
    txt += cssObjProp + " = " + cssObj.getPropertyValue(cssObjProp) + "<br>";
  }
  document.getElementById("demo").innerHTML = txt;
}
</script>
Try it Yourself »

Example

Get computed font size of the first letter in the test div (using pseudo-element):

<div id="test" style="height: 50px;background-color: lightblue;">Test Div</div>
<p>The computed font size for div::first-letter in the test div is: <span id="demo"></span></p>

<script>
function myFunction(){
  var elem = document.getElementById("test");
  var theCSSprop = window.getComputedStyle(elem, ":first-letter").getPropertyValue("font-size");
  document.getElementById("demo").innerHTML = theCSSprop;
}
</script>
Try it Yourself »

❮ Window Object