Version 5.52.2 ### Bug fixes Fix selection management in contenteditable mode when the editor doesn't have focus. Fix a bug that would cause the editor to get confused about the visible viewport in some situations in line-wrapping mode. [markdown mode](https://codemirror.net/mode/markdown/): Don't treat single dashes as setext header markers. [zenburn theme](https://codemirror.net/demo/theme.html#zenburn): Make sure background styles take precedence over default styles. [css mode](https://codemirror.net/mode/css/): Recognize a number of new properties.