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    <p>You can solve, or at least <em>avoid</em>, the problem by simply using <code>after()</code> in place of <code>append()</code>:</p> <pre><code>$("li span").last().after("&lt;span&gt;C&lt;/span&gt;"); </code></pre> <p><div class="snippet" data-lang="js" data-hide="true" data-console="false" data-babel="false"> <div class="snippet-code snippet-currently-hidden"> <pre class="snippet-code-js lang-js prettyprint-override"><code>$("li span").last().after("&lt;span&gt;C&lt;/span&gt;"); $('#generatedHTML').text($('li').html());</code></pre> <pre class="snippet-code-css lang-css prettyprint-override"><code>#generatedHTML { white-space: pre-wrap; font-family: mono; padding: 0.5em; margin: 0; background-color: #eee; } #generatedHTML::before { content: "Created HTML: "; color: #999; display: block; }</code></pre> <pre class="snippet-code-html lang-html prettyprint-override"><code>&lt;script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"&gt;&lt;/script&gt; &lt;ul&gt; &lt;li&gt; &lt;span&gt;A&lt;/span&gt; &lt;/li&gt; &lt;/ul&gt; &lt;div id="generatedHTML"&gt;&lt;/div&gt;</code></pre> </div> </div> </p> <p>Also, please note that I corrected your HTML: an <code>li</code> is <em>only</em> valid when a direct-child of a <code>ul</code> or <code>ol</code> (it should not be contained within <em>any</em> other element).</p> <p>Also, you could use a somewhat more-complicated alternative:</p> <pre><code>$("li").append("&lt;span&gt;B&lt;/span&gt;").contents().filter(function(){ return this.nodeType === 3; }).remove(); </code></pre> <p><div class="snippet" data-lang="js" data-hide="true" data-console="false" data-babel="false"> <div class="snippet-code snippet-currently-hidden"> <pre class="snippet-code-js lang-js prettyprint-override"><code>$("li").append("&lt;span&gt;B&lt;/span&gt;").contents().filter(function(){ return this.nodeType === 3; }).remove(); $('#generatedHTML').text($('li').html());</code></pre> <pre class="snippet-code-css lang-css prettyprint-override"><code>#generatedHTML { white-space: pre-wrap; font-family: mono; padding: 0.5em; margin: 0; background-color: #eee; } #generatedHTML::before { content: "Created HTML: "; color: #999; display: block; }</code></pre> <pre class="snippet-code-html lang-html prettyprint-override"><code>&lt;script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"&gt;&lt;/script&gt; &lt;ul&gt; &lt;li&gt; &lt;span&gt;A&lt;/span&gt; &lt;/li&gt; &lt;/ul&gt; &lt;div id="generatedHTML"&gt;&lt;/div&gt;</code></pre> </div> </div> </p> <p>While it's been some time, I thought it was worth also adding a plain JavaScript version of the above:</p> <pre><code>let htmlToAppend = '&lt;span&gt;B&lt;/span&gt;', span = document.querySelector('li span'); span.insertAdjacentHTML( 'afterend', htmlToAppend ); document.querySelector('#generatedHTML').textContent = span.parentNode.innerHTML; </code></pre> <p><div class="snippet" data-lang="js" data-hide="true" data-console="false" data-babel="false"> <div class="snippet-code snippet-currently-hidden"> <pre class="snippet-code-js lang-js prettyprint-override"><code>let htmlToAppend = '&lt;span&gt;B&lt;/span&gt;', span = document.querySelector('li span'); span.insertAdjacentHTML( 'afterend', htmlToAppend ); document.querySelector('#generatedHTML').textContent = span.parentNode.innerHTML;</code></pre> <pre class="snippet-code-css lang-css prettyprint-override"><code>#generatedHTML { white-space: pre-wrap; font-family: mono; padding: 0.5em; margin: 0; background-color: #eee; } #generatedHTML::before { content: "Created HTML: "; color: #999; display: block; }</code></pre> <pre class="snippet-code-html lang-html prettyprint-override"><code>&lt;ul&gt; &lt;li&gt; &lt;span&gt;A&lt;/span&gt; &lt;/li&gt; &lt;/ul&gt; &lt;div id="generatedHTML"&gt;&lt;/div&gt;</code></pre> </div> </div> </p> <p>References:</p> <ul> <li>JavaScript: <ul> <li><a href="https://developer.mozilla.org/en-US/docs/Web/API/Document/querySelector" rel="nofollow noreferrer"><code>document.querySelector()</code></a>.</li> <li><a href="https://developer.mozilla.org/en-US/docs/Web/API/Element/innerHTML" rel="nofollow noreferrer"><code>Element.innerHTML</code></a>.</li> <li><a href="https://developer.mozilla.org/en-US/docs/Web/API/Element/insertAdjacentHTML" rel="nofollow noreferrer"><code>Element.insertAdjacentHTML()</code></a>.</li> <li><a href="https://developer.mozilla.org/en/docs/Web/JavaScript/Reference/Statements/let" rel="nofollow noreferrer"><code>let</code> statement</a>.</li> <li><a href="https://developer.mozilla.org/en-US/docs/DOM/Node.nodeType" rel="nofollow noreferrer"><code>Node.nodeType</code></a>.</li> <li><a href="https://developer.mozilla.org/en-US/docs/Web/API/Node/textContent" rel="nofollow noreferrer"><code>Node.textContent</code></a>.</li> </ul></li> <li>jQuery: <ul> <li><a href="http://api.jquery.com/after/" rel="nofollow noreferrer"><code>after()</code></a>.</li> <li><a href="http://api.jquery.com/append/" rel="nofollow noreferrer"><code>append()</code></a>.</li> <li><a href="http://api.jquery.com/contents/" rel="nofollow noreferrer"><code>contents()</code></a>.</li> <li><a href="http://api.jquery.com/filter/" rel="nofollow noreferrer"><code>filter()</code></a>.</li> <li><a href="http://api.jquery.com/last/" rel="nofollow noreferrer"><code>last()</code></a>.</li> <li><a href="http://api.jquery.com/remove/" rel="nofollow noreferrer"><code>remove()</code></a>.</li> </ul></li> </ul>
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    1. POAvoid line break when using jquery append() or html()
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    1. USDavid Thomas
    1. USDavid Thomas
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    1. COGreat answer! Thanks a lot for your help!
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      1. USNicolas Forney
    2. COYou're very welcome indeed, and I'm glad to have been of help! =)
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      1. USDavid Thomas
 

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