This means that the URL in question contains a viewport <meta> tag with a maximum-scale set.
The browser's viewport is the area of the window in which web content can be seen. The viewport varies with the device, and will be smaller on a mobile phone than on a computer screen. A <meta> viewport element gives the browser instructions on how to control the page's dimensions and scaling.
Maximum-scale is an optional attribute for the viewport, and it defines the maximum zoom that website users are able to do. Setting a value for the 'maximum-scale' attribute could prevent the user from scaling properly, meaning that users may not be able to zoom in/out on mobile devices, and may cause accessibility issues.
This Hint will trigger for any internal URL which contains a viewport <meta> tag with a maximum-scale set.
This Hint would trigger for any URL that has a viewport <meta> tag in the <head>, with the maximum-scale attribute set:
<!doctype html>
<html lang="en">
<head>
<meta name="viewport" content="width=device-width, initial-scale=1.0,maximum-scale=1.4">
...
</head>
<body>...</body>
</html>
Maximum-scale is designed to prevent the user from zooming too far in on a page, and is not intrinsically bad, however it is relatively easy to accidentally set up the viewport so that the maximum-scale disables using from zooming at all, so it is generally not recommended. For this reason, Apple decided to ignore the declarations of user-scalable, minimum-scale, and maximum-scale, as of iOS 10.
The recommended, 'safe' viewport setting is:
<meta name="viewport" content="width=device-width, initial-scale=1">
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