New test case attached to clarify - we aren't trying to fit a zero width div into a zero width space; there is "negative" amount of width to fit the now outlined zero-width div.
Bug 1763431 Comment 8 Edit History
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New test case attached to clarify - we aren't trying to fit a zero width div into a zero width space; there is "negative" amount of width to fit the now outlined zero-width div. As a result, the zero-width div, despite being a block formatting context, intersects the top div.
New test case attached to clarify - we aren't trying to fit a zero width div into a zero width space; there is "negative" amount of width to fit the now outlined zero-width div. As a result, the zero-width div, despite establishing a block formatting context, intersects the top div.
New test case attachment 9271117 [details] to clarify - we aren't trying to fit a zero width div into a zero width space; there is "negative" amount of width to fit the now outlined zero-width div. As a result, the zero-width div, despite establishing a block formatting context, intersects the top div.