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HTML 

              
                <h1>Preventing Widows in Post Titles</h1>
<h2>This is a very long heading that <em>DOES NOT</em> have a widow&hellip;</h2>
<h2 class="has-orphans">This is a very long heading that <em>DOES</em> have a widow, look&hellip;</h2>
<hr>
<p>Original post in CSS-Tricks.com: <a href="https://css-tricks.com/preventing-widows-in-post-titles/" target="_blank">Preventing Widows in Post Titles</a></p>
<h3>Important technical note:</h3>
<p><strong>You can have ANY markup inside the heading and it will not get stripped out.</strong></p>
<p>At the moment of creating this demo, Chris' script in his post did not account for markup being present inside the heading. In other words, Chirs' script strips out any markup inside the <code>&lt;h1&gt;</code>, so if your heading has a link then the link goes bye-bye when it runs.</p>
<p>This improved script however doesn't strip out any markup, that's why you see the underlined words in both examples via <code>&lt;em&gt;</code>.</p>
<p>Obviously, a huge Thanks! to Chris Coyer for the original script.</p>
<hr>
<p>Some clarification about widows and orphans taken from <a href="https://css-tricks.com/preventing-widows-in-post-titles/#comment-60227" target="_blank">this comment in the above post</a>:</p>
<blockquote>
  <p>"A widow is a paragraph-ending line or word that falls at the top beginning of the following page or column – and is separated by the rest of the paragraph.</p>
  <p>An orphan is a line/word that appears by itself at the bottom of a page/column."</p>
</blockquote>
<h3>Difference between Widows and Orphans</h3>
<img src="https://assets.codepen.io/9988/widows-orphans-difference.png" alt="Difference between Widows and Orphans in typography">
<p>Source: <a href="https://thegoodpage.net/2015/11/21/rags-widows-orphans/" target="_blank">Good Rags No Widows No Orphans</a></p>
<hr>
<p>Demo created by: <a href="http://ricardozea.me/" target="_blank">Ricardo Zea</a></p>
!

CSS 

              
                @import "compass/css3";

//These properties are merely for visual enhacenment of the headings, they're not needed for the script to work.
h1 { text-align: center; }

h2 {
   max-width: 580px;
   margin: 0 auto 20px;
   padding: 20px;
   font: 40px Montserrat;
   background: rgba(white, 0.04);
   box-shadow: inset 0 0 0 5px rgba(black, 0.2);   
}






//Styling stuff, not needed for the demo
//Google Fonts
@import url(https://fonts.googleapis.com/css?family=Montserrat);
@import url(https://fonts.googleapis.com/css?family=Source+Sans+Pro:300,300italic);

//Sass/Compass stuff
@import "compass/css3/images";
$MyBlack: #272822;
$r: #c03;
$g: #429032;
$b: #2963bd;
$y: #c90;

* { @include box-sizing(border-box); }
html { height: 100%; }
body {
   @include background(radial-gradient(lighten($MyBlack, 5%), $MyBlack 80%));
   color: white;
   font: 16px "Source Sans Pro";
   padding: 30px;
}
h3 { font-size: 25px; }
hr {
   border: none;
   border-top: #666 1px dotted;
}
blockquote { font-style: italic; }
em {
   text-decoration: underline;
   font-style: normal;
}
code {
   padding: 5px;
   font-style: italic;
   background: rgba(black, 0.15);
   font: 14px Courier;
   box-shadow: inset 0 0 1px rgba(black, 0.5);
}
a,
a:visited { color: $b; }
a:hover {
   color: $y;
   text-decoration: none;
}

.new-window {
   position: relative;
   padding-right: 16px;
   &:after {
      content: "";
      display: block;
      width: 14px;
      height: 12px;
      position: absolute;
      top: 10%;
      right: 0;
      background: url(https://i.stack.imgur.com/3H2PQ.png) no-repeat;
   }
}
!

JS 

              
                //***ATTENTION!!!***:
//When using this script in production you need to remove the ".not('.has-orphans')" method below */

$("h1, h2").not(".has-orphans").each(function() {
    var wordArray = $(this).html().split(" ");
    if (wordArray.length > 1) {
        wordArray[wordArray.length-2] += "&nbsp;" + wordArray[wordArray.length-1];

        var lastWord = wordArray.pop();
        lastWord = lastWord.replace(/.*((?:<\/\w+>)*)$/, "$1");
        $(this).html(wordArray.join(" ") + lastWord);
    }
});

/* 
   I left the original (but adapted) script from Chris' post for reference only.
   If you want to see it work (or 'not work' for that matter), just uncomment the script below and comment the top one.
  What you'll see is that the words "DOESN'T" and "DOES" are not underlined anymore and both headings have no orphans.
*/

/*
$("h1").each(function() {
  var wordArray = $(this).text().split(" ");
  if (wordArray.length > 1) {
    wordArray[wordArray.length-2] += "&nbsp;" + wordArray[wordArray.length-1];
    wordArray.pop();
    $(this).html(wordArray.join(" "));
  }
});*/

//Add a title to the links that open in a new tab/window
$("a[target='_blank']").attr({title:'Link opens in a new tab'}).addClass('new-window');
!
999px

Console