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    <p>Yes, it resets the element's display property to the default by blanking out the inline "display: none", causing the element to fall back on its display property as defined by the page's ranking CSS rules.</p> <p>For example, here's a <code>&lt;div&gt;</code> with the ID of "myElement".</p> <pre><code>&lt;div id="myElement"&gt;&lt;/div&gt; </code></pre> <p>A <code>&lt;div&gt;</code> has a setting of <code>display:block</code> by default. In our style sheet, suppose we specify that your <code>&lt;div&gt;</code> is to be displayed as <code>table</code>:</p> <pre><code>div#myElement { display:table; } </code></pre> <p>Upon loading your page, the <code>&lt;div&gt;</code> is displayed as <code>table</code>. If you want to hide this <code>&lt;div&gt;</code> with scripting, you might do any of these:</p> <pre><code>// JavaScript: document.getElementById("myElement").style.display = 'none'; // jQuery: $("#myElement").toggle(); // if currently visible $("#myElement").hide(); $("#myElement").css({"display":"none"}); </code></pre> <p>All of thse have the same effect: adding an inline <code>style</code> property to your <code>&lt;div&gt;</code>:</p> <pre><code>&lt;div id="myElement" style="display:none"&gt;&lt;/div&gt; </code></pre> <p>If you wish to show the element again, any of these would work:</p> <pre><code>// JavaScript: document.getElementById("myElement").style.display = ""; // jQuery: $("#myElement").toggle(); // if currently hidden $("#myElement").show(); $("#myElement").css({"display":""}); </code></pre> <p>These remove the <code>display</code> CSS property from the inline <code>style</code> property:</p> <pre><code>&lt;div style=""&gt;&lt;/div&gt; </code></pre> <p>Since the inline style no longer specifies a <code>display</code>, the <code>&lt;div&gt;</code> goes back to being displayed as <code>table</code>, since that's what we put in the style sheet. The <code>&lt;div&gt;</code> does <strong>not</strong> revert to being displayed as <code>block</code> because our CSS overrode that default setting; blanking out the inline <code>display</code> property does not negate the rules in our style sheets.</p> <hr> <p>For giggles, here's the Google query I used for verification of my answer: <code>javascript style display empty string default</code></p> <p>...and a couple of links where this is mentioned:</p> <p><a href="http://jszen.blogspot.com/2004/07/table-rowsrevealed.html" rel="noreferrer">http://jszen.blogspot.com/2004/07/table-rowsrevealed.html</a></p> <p><a href="http://www.harrymaugans.com/2007/03/05/how-to-create-a-collapsible-div-with-javascript-and-css/" rel="noreferrer">http://www.harrymaugans.com/2007/03/05/how-to-create-a-collapsible-div-with-javascript-and-css/</a> (not in the article, but in the comments section)</p>
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    1. POWhat does style.display = '' actually do?
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    1. POWhat does style.display = '' actually do?
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    1. COJake, thank you very much for the explanation and the links. I truly appreciate that a great deal. Thank you!
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      1. USShawn Spencer
 

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