Created attachment 8840781 [details] bug_firefox.html User Agent: Mozilla/5.0 (Windows NT 6.1; WOW64; rv:51.0) Gecko/20100101 Firefox/51.0 Build ID: 20170125094131 Steps to reproduce: I wrote a simple html page, i divided the page in 4 divs instead of use a table. each div has a button with no action. I have notice that this strange behavior is present only if i use html5 doctype instead html4. Actual results: If i click on the button in the right-top corner div (button BB) the page will be resize randomly. Expected results: The page should keep the same size.
Component: Untriaged → Layout
Product: Firefox → Core
Something strange is probably happening with the scrollable overflow area calculations, which is making the scrollbars appear and disappear (as we search for a layout that is either stable with scrollbars or stable without them).
And it seems like it might be related to the half-width-overflow of the border-collapsed borders.
Component: Layout → Layout: Tables
Summary: [DOCTYPE] if use html5, the buttons resize the page in randomly behavior → [standards mode only] pressing button randomly toggles canvas scrollbars due to half-width overflow of border-collapse table borders
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