92637 2012-07-30 05:21:35 -0700 webkitRegionOverflow giving random value 2012-08-20 04:08:41 -0700 1 1 1 Unclassified WebKit CSS 528+ (Nightly build) Unspecified Unspecified RESOLVED DUPLICATE 93965 P2 Normal --- 0 johanneswilm webkit-unassigned andreionea3000 johanneswilm mibalan oldest_to_newest 681902 0 johanneswilm 2012-07-30 05:21:35 -0700 It seems that there is a bug in Chromium/Webkit that makes webkitRegionOverflow output random values. At times it says it fits, when it doesn't and at other times it says overflow, when it really does fit. The overset property of a NamedFlow gives the same random result. The below code shows how I try to add new pages based on whether the previous is full. You can check out the full example by including the JS/CSS from this project:https://github.com/sourcefabric/BookJS function setupDocument() { $('body').wrapInner('<div id="contents" />'); $('body').append('<div id="layout" />'); $('#layout').append('<div class="page"><div class="contents"></div><div class="pagenumber"></div></div>'); } $(document).ready(function () { setupDocument(); var lastColumnState; var fillingPages = true; setTimeout(function () { while (fillingPages == true) { lastColumnState = $(".page:last .contents")[0].webkitRegionOverflow; if (lastColumnState == 'overflow') { $('#layout').append('<div class="page"><div class="contents"></div><div class="pagenumber"></div></div>'); } else if (lastColumnState == 'fit' || lastColumnState == 'empty') { fillingPages = false; } } }, 1000); }); 694963 1 mibalan 2012-08-14 07:43:08 -0700 This bug is a duplicate of #93965. The cause for this odd behavior seems to be the use of «position: relative» on the content that gets flowed in the regions. 697171 2 mibalan 2012-08-16 08:31:45 -0700 Regarding webkitRegionOverflow being 'overflow' instead of 'fit', this most probably is caused by the part of the content *below* the text baseline that's (usually) invisible for the user, but still causes overflow. This last situation would be a lot trickier to fix, unfortunately :( 699388 3 johanneswilm 2012-08-20 04:08:41 -0700 *** This bug has been marked as a duplicate of bug 93965 ***