This means that the URL in question does not contain a viewport <meta> tag in the <head>
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.
Without a viewport, mobile devices will render the page at a typical desktop screen width, scaled to fit the screen.
This Hint will trigger for any internal URL which contains no viewport <meta> tag in the <head>
If the pages in questions are not designed to be viewed on multiple different devices (e.g. there is a separate mobile site), then this Hint can be safely ignored. However, pages designed for a variety of devices must include a meta viewport tag in the head of the document. A meta viewport tag gives the browser instructions on how to control the page's dimensions and scaling.
Add a viewport in the <head> of the document:
<meta name="viewport" content="width=device-width, initial-scale=1">
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