Build Identifier: https://hg.mozilla.org/mozilla-central/rev/63be002b4a803df1122823841ef7633b7561d873 Mozilla/5.0 (Windows NT 6.1; WOW64; rv:48.0) Gecko/20100101 Firefox/48.0 ID:20160327030437 Edge and Chrome work as expected. Reproducible: always Steps To Reproduce: 1. Open attached testcase Actual Results: Text and the scroll bar are not displayed Expected Results: Text"abcd" should be visible at initial page loading. And horizontal scroll bar should be provided.
https://drafts.csswg.org/css-writing-modes/#principal-flow > 8. The Principal Writing Mode > > The principal writing mode of the document is determined by the writing-mode > and direction values specified on the root element. This writing mode is > used, for example, to determine the direction of scrolling and the default > page progression direction. > > As a special case for handling HTML documents, if the root element has a > <body> child element [HTML5], the principal writing mode is instead taken > from the values of writing-mode and direction on the first such child > element instead of taken from the root element. Note that this does not > affect the values of writing-mode or direction on the root element itself. So this is our fault.
When trying attachment 8735300 [details] with Firefox 52.0a1 buildID=20161017030209: - an horizontal scrollbar is rendered - "abcd" text is accessible - "abcd" text is not visible at initial page load: you must use the horizontal scrollbar to see it - the horizontal scrollbar thumb is not draggable (we have encountered and reported this symptom in other bug reports)
Yep, There is small progression. scrollbar is displayed on 51.0a2+, but not on beta50.
Mass bug change to replace various 'parity' whiteboard flags with the new canonical keywords. (See bug 1443764 comment 13.)
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