Bug 212292

Created attachment 400093 [details] A video demonstrating the bug Overview: In Safari 13.1 on macOS 10.14 and 10.15, setting a TEXTAREA's value through Javascript and deleting lines from the middle to the top with the DELETE/BACKSPACE key doesn't remove empty lines. This doesn't occur on any other browser tested (Chrome, Firefox, Opera, Brave, Edge). Steps to Reproduce: 1. Navigate to the test case at: https://jsfiddle.net/d75xzjg0/3/ 2. Insert the cursor on the empty line between 3 and 4. 3. Type DELETE/BACKSPACE six types to remove the lines for 3, 2, and 1. Actual Result: The text is removed but the empty lines remain. The position of the lines for 4, 5, and 6 do not change. Expected Result: We expect the newly empty lines to be removed with DELETE/BACKSPACE, so the lines for 4, 5, and 6 are pulled up to the top of the TEXTAREA. This is the behavior on other browsers, and the behavior of Safari prior to 13.1. Notes: I've attached a video demonstrating the issue. If the jsFiddle is unavailable, the code to reproduce is: ~~~ <textarea rows="20" cols="50"></textarea> <script type="text/javascript"> var sel = document.querySelector('textarea'); sel.value = "1\n2\n3\n\n4\n5\n6\n"; </script> ~~~ The issue occurs whether the newlines of the inserted text are CRLF or LF. The issue also persists whether or not there is default text in the TEXTAREA.