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    <p>Once you set window.location the original page will be unloaded before the new page is loaded by the browser. This means your script will be gone before the new page start loading and thus can't modify the new HTML anymore.</p> <p>This behavior is inherent to the security model of the browser. Without it you could inject any JavaScript into any web site of your choosing, which would be a huge security risk. What you are asking for is so-called XSS (for cross site scripting), which is prevented by the browser applying a so-called SOP (for same-original policy).</p> <p>There are some common ways to work around this limitation in a safe way:</p> <ol> <li><p>Set up a proxy to serve both your JavaScript and the original site. This way both your script and the original site come from the same domain and satisfy the browser's same-original policy (SOP). You could run the original site in an iframe with your custom script occupying the top-level window. Alternatively you could inject your script into the HTML as it is being retrieved through your proxy.</p></li> <li><p>Run your script as a browser add-on or user-script. If you choose to do this, the user will have to specifically grant your script the rights to run locally with elevated rights. Greasemonkey popularized client-side scripts for Firefox a few years ago, but recently they seem to have lost momentum.</p></li> <li><p>Ask the site owner to include your script. I doubt this is a valid option for your situation. But if it is a valid option it is definitely the simplest one.</p></li> <li><p>Ask the user to run your script after the site has loaded. This one is probably also not valid for you, but if valid it would once again be a very simple solution.</p></li> </ol>
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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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