off-left method (e.g. left: -999em) is bad for RTL, cuz when on RTL mode it widens the page on all browsers (forming a horizontal scroll bar), and puts the to-be-hidden element on a far, visible position.
I suggest simply moving to off-top - I'm not aware of any disadvantages of off-top.

Attached is a page.

More details in my blog post http://www.held.org.il/blog/?p=260

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acquia_marina_change_off_left_to_off_top.patch869 bytesOren_Held

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stephthegeek’s picture

stephthegeek commented
Status: Active » Closed (fixed)

Thanks for the tip, looks like we're not using this technique anymore in 3.x