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    <pre><code>&lt;pre&gt; &lt;!DOCTYPE html&gt; &lt;html&gt; &lt;head&gt; &lt;meta charset="utf-8"&gt; &lt;title&gt;Mileage Record&lt;/title&gt; &lt;style type = "text/css"&gt; table { width:300px; border-collapse:collapse; background-color:lightblue; } table, td, th { border: 1px solid black; padding: 4px; } th { text-align: left; color: white; background-color: darkblue } tr.oddrow { background-color: white; } &lt;/style&gt; &lt;script&gt; // var milesDriven; // var gallonsUsed; // var mpg; var anyMore=0; var str="&lt;table&gt;"; str+="&lt;thead&gt;&lt;tr&gt;&lt;th&gt;Miles Driven&lt;/th&gt;"; str+="&lt;th&gt;Gallons Used&lt;/th&gt;"; str+="&lt;th&gt;MPG&lt;/th&gt;"; str+="&lt;/tr&gt;&lt;/thead&gt;&lt;tbody&gt;"; function milesDriven(){ return window.prompt("How many miles did you drive?"); } function gallonsUsed(){ return window.prompt("How many gallons did you use?"); } function mpg(){ return milesDriven()/gallonsUsed(); } function addComponentsToDOM(){ while (anyMore&lt;3) { //not 0 is true or not undefined is true or not null is true str+="&lt;tr&gt;&lt;td&gt;" + milesDriven() + "&lt;/td&gt;&lt;td&gt;" + gallonsUsed() + "&lt;/td&gt;&lt;td&gt;" + mpg() + "&lt;/td&gt;&lt;/tr&gt;" // anymore = confirm("Do you have any more data to input?"); anyMore++; } str+="&lt;/tbody&gt;&lt;/table&gt;"; //document.writeln(); i suggest you not use this method add component to DOM tree //because this method first empty DOM tree content document.body.innerHTML=str; } //why use this event,because window after loaded document.body not null window.onload=addComponentsToDOM; &lt;/script&gt; &lt;/pre&gt; </code></pre>
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Guidance
A row detail

Detail views are divided into sections. All the information in the data section comes from columns in the selected row. The other sections display data from other, related rows.

Related data can be related in a to-one or a to-many fashion. Captions of data related in a to-many fashion link to a list view showing a filtered view of the table.

Try moving around until you find a non-empty to-many entry and click on the label to get to one. You can move back to the root by clicking on the database name in the header.

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If you are curious you may find further information in the browser console, which is accessible through the devtools (F12).

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