Truncating long strings with CSS: feasible yet?

If you're OK with a JavaScript solution, there's a jQuery plug-in to do this in a cross-browser fashion - see http://azgtech.wordpress.com/2009/07/26/text-overflow-ellipsis-for-firefox-via-jquery/

Update: text-overflow: ellipsis is now supported as of Firefox 7 (released September 27th 2011). Yay! My original answer follows as a historical record.

Justin Maxwell has cross browser CSS solution. It does come with the downside however of not allowing the text to be selected in Firefox. Check out his guest post on Matt Snider's blog for the full details on how this works.

Note this technique also prevents updating the content of the node in JavaScript using the innerHTML property in Firefox. See the end of this post for a workaround.

CSS

.ellipsis {
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
    -o-text-overflow: ellipsis;
    -moz-binding: url('assets/xml/ellipsis.xml#ellipsis');
}

ellipsis.xml file contents

<?xml version="1.0"?>
<bindings
  xmlns="http://www.mozilla.org/xbl"
  xmlns:xbl="http://www.mozilla.org/xbl"
  xmlns:xul="http://www.mozilla.org/keymaster/gatekeeper/there.is.only.xul"
>
    <binding id="ellipsis">
        <content>
            <xul:window>
                <xul:description crop="end" xbl:inherits="value=xbl:text"><children/></xul:description>
            </xul:window>
        </content>
    </binding>
</bindings>

Updating node content

To update the content of a node in a way that works in Firefox use the following:

var replaceEllipsis(node, content) {
    node.innerHTML = content;
    // use your favorite framework to detect the gecko browser
    if (YAHOO.env.ua.gecko) {
        var pnode = node.parentNode,
            newNode = node.cloneNode(true);

        pnode.replaceChild(newNode, node);
    }
};

See Matt Snider's post for an explanation of how this works.

2014 March: Truncating long strings with CSS: a new answer with focus on browser support

Demo on http://jsbin.com/leyukama/1/ (I use jsbin because it supports old version of IE).

<style type="text/css">
    span {
        display: inline-block;
        white-space: nowrap;
        overflow: hidden;
        text-overflow: ellipsis;     /** IE6+, Firefox 7+, Opera 11+, Chrome, Safari **/
        -o-text-overflow: ellipsis;  /** Opera 9 & 10 **/
        width: 370px; /* note that this width will have to be smaller to see the effect */
    }
</style>

<span>Some very long text that should be cut off at some point coz it's a bit too long and the text overflow ellipsis feature is used</span>

The -ms-text-overflow CSS property is not necessary: it is a synonym of the text-overflow CSS property, but versions of IE from 6 to 11 already support the text-overflow CSS property.

Successfully tested (on Browserstack.com) on Windows OS, for web browsers:

• IE6 to IE11
• Opera 10.6, Opera 11.1, Opera 15.0, Opera 20.0
• Chrome 14, Chrome 20, Chrome 25
• Safari 4.0, Safari 5.0, Safari 5.1
• Firefox 7.0, Firefox 15

Firefox: as pointed out by Simon Lieschke (in another answer), Firefox only support the text-overflow CSS property from Firefox 7 onwards (released September 27th 2011).

I double checked this behavior on Firefox 3.0 & Firefox 6.0 (text-overflow is not supported).

Some further testing on a Mac OS web browsers would be needed.

Note: you may want to show a tooltip on mouse hover when an ellipsis is applied, this can be done via javascript, see this questions: HTML text-overflow ellipsis detection and HTML - how can I show tooltip ONLY when ellipsis is activated

Resources:

• https://developer.mozilla.org/en-US/docs/Web/CSS/text-overflow#Browser_compatibility
• http://css-tricks.com/snippets/css/truncate-string-with-ellipsis/
• https://stackoverflow.com/a/1101702/759452
• http://www.browsersupport.net/CSS/text-overflow
• http://caniuse.com/text-overflow
• http://msdn.microsoft.com/en-us/library/ie/ms531174(v=vs.85).aspx
• http://hacks.mozilla.org/2011/09/whats-new-for-web-developers-in-firefox-7/