HTMLElement.offsetLeft

The HTMLElement.offsetLeft read-only property returns the number of pixels that the upper left corner of the current element is offset to the left within the HTMLElement.offsetParent node.

For block-level elements, offsetTop, offsetLeft, offsetWidth, and offsetHeight describe the border box of an element relative to the offsetParent.

However, for inline-level elements (such as span) that can wrap from one line to the next, offsetTop and offsetLeft describe the positions of the first border box (use Element.getClientRects() to get its width and height), while offsetWidth and offsetHeight describe the dimensions of the bounding border box (use Element.getBoundingClientRect() to get its position). Therefore, a box with the left, top, width and height of offsetLeft, offsetTop, offsetWidth and offsetHeight will not be a bounding box for a span with wrapped text.

Syntax

left = element.offsetLeft;

left is an integer representing the offset to the left in pixels from the closest relatively positioned parent element.

Example

var colorTable = document.getElementById("t1");
var tOLeft = colorTable.offsetLeft;
 
if (tOLeft > 5) {
  // large left offset: do something here
}

This example shows a 'long' sentence that wraps within a div with a blue border, and a red box that one might think should describe the boundaries of the span.

Image:offsetLeft.jpg

<div style="width: 300px; border-color:blue;
  border-style:solid; border-width:1;">
  <span>Short span. </span>
  <span id="longspan">Long span that wraps within this div.</span>
</div>

<div id="box" style="position: absolute; border-color: red;
  border-width: 1; border-style: solid; z-index: 10">
</div>

<script>
  var box = document.getElementById("box");
  var longspan = document.getElementById("longspan");
  box.style.left = longspan.offsetLeft + document.body.scrollLeft + "px";
  box.style.top = longspan.offsetTop + document.body.scrollTop + "px";
  box.style.width = longspan.offsetWidth + "px";
  box.style.height = longspan.offsetHeight + "px";
</script> 

Specification

Specification Status Comment
CSS Object Model (CSSOM) View Module
The definition of 'offsetLeft' in that specification.
Working Draft

Browser compatibility

Update compatibility data on GitHub
DesktopMobile
ChromeEdgeFirefoxInternet ExplorerOperaSafariAndroid webviewChrome for AndroidFirefox for AndroidOpera for AndroidSafari on iOSSamsung Internet
offsetLeft
Experimental
Chrome Full support 1Edge Full support 12Firefox Full support 1IE Full support 8Opera Full support 8Safari Full support 3WebView Android Full support 1Chrome Android Full support 18Firefox Android Full support 4Opera Android Full support 10.1Safari iOS Full support 1Samsung Internet Android Full support 1.0

Legend

Full support  
Full support
Experimental. Expect behavior to change in the future.
Experimental. Expect behavior to change in the future.

See also