[Webkit-unassigned] [Bug 150715] Excessive zoom applied to Bootstrap v3 modal (new iOS 9 breakage)

Sat Oct 31 11:16:49 PDT 2015

https://bugs.webkit.org/show_bug.cgi?id=150715

Wenson Hsieh <wenson_hsieh at apple.com> changed:

           What    |Removed                     |Added
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                 CC|                            |wenson_hsieh at apple.com

--- Comment #1 from Wenson Hsieh <wenson_hsieh at apple.com> ---
Similar to <http://wkbug.com/146244>, this is related to how the <body> height is being computed as a very small value. This can be verified in jsbin test case by putting height: 100vh on the <body> and seeing that the excessive zoom doesn't occur.

It would be useful to know what heights Chrome and Firefox on mobile compute for the <body> element. On desktop, Safari, Chrome and Firefox all compute the body height to be about 46px, so I would guess it's the same for mobile, but it would definitely be good to double check.

I suppose a temporary workaround for both this issue and <http://wkbug.com/146244> is forcing the body element to cover the page, but for an actual fix, we need to know whether having a tiny/very short <body> is something we should support. If not, we need to figure out what's causing us to compute body height to be such a small value; otherwise, we'll need to adjust the way we handle various iOS-specific behaviors (e.g. zooming and input assistance) to do the right thing even when the body element is tiny.

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