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    <p>There's now a <a href="https://www.w3.org/standards/history/page-visibility" rel="nofollow noreferrer">page visibility API</a> for this, and it is well-supported by all the most recent versions of major browsers on Windows, Mac OS X, and Linux (though I have not actually tested all browsers with a fair share of the Linux browser market).</p> <p>The page visibility API is now the best approach for checking visibility; the only caveats are that it can't tell you what parts of the browser window are visible (just that nothing is visible or at least some part is), and that support has only been present since 2016 on Linux, 2015 on Mac, and 2014 (possibly earlier) on Windows.</p> <p>While support was being rolled out, a false negative was rare, but false positives occurred on some platforms; for example, in 2014, OSX rendered miniature versions of minimized applications in the dock, and as a result of the way this had been done, an application could not easily tell whether it was minimized, as it was still asked to paint the screen. Linux had complications with knowing whether your application was on a non-visible workspace, and whether another window was occluding it.</p> <p>The first public draft was published in June, 2011, and it reached "recommendation" status in May 2013. By March, 2014, the most recent versions of all major Windows browsers had full support for the standard. Full support for all major Mac browsers was achieved in April, 2015. Linux support was achieved for at least Chromium by August of 2016 (when <a href="https://code.google.com/p/chromium/issues/detail?id=293128" rel="nofollow noreferrer">Chromium issue 293128</a> was closed); while I have not tested them, I expect other Linux browsers have likely kept pace, as the hardest part of the work seems to have been adjusting OS/GUI tookit contracts and APIs to make knowing whether your desktop application is visible possible.</p>
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    1. POHow can it be detected if a page is on background or foreground with jquery/javascript?
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    1. USTheodore Murdock
    1. USTheodore Murdock
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    1. COVery interesting, especially being able to detect the "prerender" state, which has bitten me before...
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      1. USMichelle Tilley
    2. COI didn't know such a API, thanks. But it seems that it's not so logical to use in production such a experimental API.
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      1. USÇağatay Gürtürk
 

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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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