Apple's documentation does a good job explaining how web developers can use this tag, but we had to do some detective work to figure out exactly how to implement it in Fennec. Many other mobile browsers now support this tag, although it is not part of any web standard. To mitigate this problem of virtual viewport on narrow screen devices, Apple introduced the "viewport meta tag" in Safari iOS to let web developers control the viewport's size and scale. However, this mechanism is not so good for pages that are optimized for narrow screens using media queries - if the virtual viewport is 980px for example, media queries that kick in at 640px or 480px or less will never be used, limiting the effectiveness of such responsive design techniques.
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