use visualViewport's value for $(window).height()

[gulping]

Description

In recent Chrome,window.visualViewport is available to get window size.
Window.visualViewport - Web APIs | MDN

This is the only value that can follow the address bar shrinking on mobile browsers.
window.innerHeight, document.documentElement.clientHeight don't work well.

So consider to use window.visualViewport.height for $(window).height() if possible.

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(Ditto for width.)

[dmethvin]

Right now it's only supported on Chrome-ish browsers so the behavior would be different across platforms. One problem I see is that the visualViewport fires a resize event (and I assume the window does not in the same case?) so in addition to using the viewport for $(window).height() the user would need us to use it for $(window).on("resize") as well in order for the charade to be effective.

[timmywil]

Thanks for the suggestion. We'll keep this in mind for now, but we'll refrain from using it until it propagates to more browsers.