Created attachment 473354 [details] Text case (contenteditable) Steps to Reproduce: 1. Display the attached file (textarea-vertical-rl.html). - Create a textarea. - Set the writing-mode property to vertical-rl or vertical-lr. 2. Click on the position marked with “x.” Current Behavior: - The caret does not appear at the clicked position “x” but is displayed lower down (current_behavior.png). Expected Behavior: - The caret should appear at the clicked position “x”. Other Information: - The caret misalignment occurs after a certain number of lines. - As the number of lines increases, the caret misalignment becomes more pronounced. - This issue also happens with contenteditable (contenteditable-vertical-rl.html).