i have a mobile website for iphone and ipad where i disable user zooming with 

<meta name="viewport" content="width=device-width, initial-scale=1.0, user-scalable=no" />

this works fine as long as the site is in landscape mode. the width of the website is exactly the width of the screen. then if i rotate the device into portrait mode it gets scaled down so that it fits the new (shorter) width. this is also ok.

but then if i rotate it back to landscape mode it is suddenly scaled to about 125% that means horizontal scrolling is now possible and zooming is not possible since initially disabled.

how can i make it back at 100% zoom when rotated back to landscape?

thanks!

ipad mobile-safari zooming
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