There's a related issue with just moving the caret into overflowing territory with arrow keys, too. If I click near the beginning of one of the widgets in this testcase, and then try to use the arrow keys to scroll do the end, there's no way to just move the caret character-by-character in a way that lets me see the overflowing content. Downarrow does seem to move the caret, but once the caret reaches the end, we just draw it at the bottom of the textarea without actually visually scrolling the content. In contrast: in Chrome, rightarrow moves the caret downwards, and it does successfully scroll the content when it reaches the overflowing content.
Bug 1802466 Comment 3 Edit History
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There's a related issue with just moving the caret into overflowing territory with arrow keys, too. If I click near the beginning of one of the widgets in this testcase, and then try to use the arrow keys to scroll towards the end, there's no way to just move the caret character-by-character in a way that lets me see the overflowing content. Downarrow does seem to move the caret, but once the caret reaches the end, we just draw it at the bottom of the textarea without actually visually scrolling the content. In contrast: in Chrome, rightarrow moves the caret downwards, and it does successfully scroll the content when it reaches the overflowing content.