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When I open this URL http://www.whatwg.org/specs/web-apps/current-work/multipage/browsers.html#dom-window-item, initially the page is correctly positioned at the paragraph "To determine the value of an indexed property index of a Window object,..." (due to the hashtag). However, a few seconds after page load, the vertical page position jumps some 100px below that position, so that the title of section 6.2.4 is displayed on top. (I tested in Firefox, and Chrome (both latest)). This jump should not happen, should it?
There was a bug in my CSS. Try now. Thanks!
The issue no longer occurs. Thanks for fixing this :-)